First commit

7 years ago · 46913f5fc2
26 changed files with 1616 additions and 0 deletions
--- a/chapter)/DesignTimeBuild/.dtbcache
+++ b/chapter)/DesignTimeBuild/.dtbcache
--- a/chapter)/v15/.suo
+++ b/chapter)/v15/.suo
--- a/chapter)/v15/Server/sqlite3/db.lock
+++ b/chapter)/v15/Server/sqlite3/db.lock
--- a/chapter)/v15/Server/sqlite3/storage.ide
+++ b/chapter)/v15/Server/sqlite3/storage.ide
--- a/chapter)/v15/Server/sqlite3/storage.ide-shm
+++ b/chapter)/v15/Server/sqlite3/storage.ide-shm
--- a/chapter)/v15/Server/sqlite3/storage.ide-wal
+++ b/chapter)/v15/Server/sqlite3/storage.ide-wal
--- a/chapter).sln
+++ b/chapter).sln
@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.27703.2042
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "test(4th chapter)", "test(4th chapter)\test(4th chapter).csproj", "{AD1F5564-69D8-4482-84A0-3566CF5ADB66}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{AD1F5564-69D8-4482-84A0-3566CF5ADB66}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AD1F5564-69D8-4482-84A0-3566CF5ADB66}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AD1F5564-69D8-4482-84A0-3566CF5ADB66}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AD1F5564-69D8-4482-84A0-3566CF5ADB66}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {12804E09-AE25-40AA-AA91-1DE7305E134C}
+	EndGlobalSection
+EndGlobal
--- a/chapter)/Program.cs
+++ b/chapter)/Program.cs
@ -0,0 +1,744 @@
+#define DEBUG                             //ДЕРЕКТИВЫ ПРЕПРОЦЕССОРА
+#define TESTING
+using System;
+using System.IO;
+using System.Text;
+using System.ComponentModel;
+using System.Collections.Generic;
+using System.Runtime.CompilerServices;
+using static System.Console;
+
+namespace test_4th_chapter_
+{
+    using System.Dynamic;
+    using RandomNamespace;
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            string nullstr = null; //норм                   ТИПЫ ДОПУСКАЮЩИЕ NULL
+            //int n = null; - ошибка
+            int? intnll = null; //норм
+            WriteLine("{0}\t{1}\t{2}\t{3}", nullstr == null, intnll == null, intnll = 10, intnll = null);
+            int? ni = null;
+            int? nni = 5, dopnull = 7;
+            int inn = 6;
+            WriteLine("null == 5: {0}, 5? == 6: {1}, null > 4: {2}, 5? > 4: {3}, \n6 + null: {4}, 5? + null: {5}, 5? + 6: {6}\n",
+                ni == nni, nni == inn, ni > 4, nni > 4, inn + ni, nni + ni, inn + nni);
+            bool? n = null;
+            bool? f = false;
+            bool? t = true;
+            WriteLine("n | n " + (n | n));    // (null)
+            WriteLine("n | f " + (n | f));    // (null)
+            WriteLine("n | t " + (n | t));    // True
+            WriteLine("n & n " + (n & n));    // (null)
+            WriteLine("n & f " + (n & f));    // False
+            WriteLine("n & t " + (n & t));    // (null)
+
+            WriteLine("5 ?? null: {0}, null ?? 7 ?? 6: {1}", ni ?? nni, ni ?? dopnull ?? nni);
+            StringBuilder sb = null;
+            int length = sb?.ToString().Length ?? 0;        //ЕСЛИ SB = NULL, ТО LENGTH = 0
+            WriteLine(length);
+            Otstup();
+
+
+
+            // Transformer t = new Transformer(Square); - Идентично со следующей строкой
+            Transformer trns = Square;             //ПРИСВОЕНИЕ ДЕЛЕГАТУ МЕТОДА
+            trns += Sqrt;                          //СОЗДАНИЕ ГРУППОВОГО ДЕЛЕАТА
+            trns -= Sqrt;
+            TransformerR r = Square2;
+            r += Square2;
+            //t += Square;
+            int x = 3;
+            // t(3) == t.Invoke(3)        -идентичные методы вызова метода square
+            WriteLine("{0} {1} {2} {3}", trns(x), x, r(ref x), x);
+
+            int[] values = { 1, 2, 3, 4 };
+            Util.Transform(values, Square);
+            foreach (int i in values)
+                Write("{0} ", i);
+            Otstup();
+
+            string[] strings = { "aa", "bb", "cc" };
+            Util.Transform(strings, Dobavka);
+
+            for (int i = 0; i < strings.Length; i++)
+                Write("{0} ", strings[i]);
+            WriteLine();
+
+            foreach (string s in strings)
+                Write("{0} ", s);
+            Otstup();
+
+
+            ProgressReporter p = Progress;
+            p += Progress2;
+            Util.HardWork(p);
+            Otstup();
+
+            Check tr = Check;
+            WriteLine("{0} {1} {2} {3} {4} {5} {6} {7} {8} {9} {10}",
+                tr(-2), tr(-1), tr(0), tr(1), tr(2), tr(3), tr(4), tr(5), tr(6), tr(8), tr(16));
+            Otstup();
+
+            ObjectD objectD = Stringa;
+            objectD += Square;
+            object obj = objectD();
+            Write(obj + "\t");
+            objectD -= Square;
+            Write(obj = objectD());
+            Otstup();
+
+
+            var stock = new Stock("STK");
+            stock.PChanged += ReportPrice;
+            stock.Price = 123;
+            stock.Price = 321;
+            Otstup();
+
+
+            var s2tock = new Stock2("STK2");
+            s2tock.PChanged += PriceChn;
+            s2tock.Price = 123;
+            s2tock.Price = 125;
+            s2tock.Price = 153;
+            Otstup();
+
+
+            var s3tock = new Stock3("STK3");
+            s3tock.ChangedPrice += Price3Stock;
+            s3tock.Price = 123;
+            s3tock.Price = 321;
+            Otstup();
+
+
+            var testo = new Testo();
+            testo.X = 20;
+            testo.X = 30;
+            testo.X = 20;
+            testo.X = 50;
+            Otstup();
+
+
+            Transformer lambda = z => z * z;            //ЛЯМБДА ВЫРАЖЕНИЕ
+            WriteLine(lambda(3));
+
+            Func<int, int> funcLambda = fla => { return fla * fla; };
+            WriteLine(funcLambda(3));
+
+            Func<string, string, int> totalLambda = (s1, s2) => s1.Length + s2.Length;
+            WriteLine(totalLambda("hellp", "world"));
+
+            Transformer lambdaV = z => z * lambda(10);
+            WriteLine(lambdaV(5));
+
+            int buf = 2;
+            Func<int, int, int> incr = (f1, f2) => buf = f1 * f2;
+            WriteLine("{0} {1} {2}", buf, incr(20, 5), buf);
+
+            int seed = 0;
+            Func<int> nat = () => ++seed;
+            WriteLine("{0} {1} {2}", nat(), nat(), seed);
+            Otstup();
+
+
+            Action[] actions = new Action[3];
+            Action[] actions2 = new Action[3];
+            for (int i = 0; i < actions.Length; i++)
+            {
+                int te = i;
+                actions2[i] = () => Write(te);
+                actions[i] = () => Write(i);
+            }
+            foreach (Action a in actions) a();
+            WriteLine();
+            foreach (Action a in actions2) a();
+            Otstup();
+
+
+
+            Transformer anon = delegate (int an) { return an * an; };   //АНОНИМНЫЙ МЕТОД
+            WriteLine(anon(3));
+            Otstup();
+
+
+            try
+            {
+                int zero = 0;
+                x = 10 / zero;
+                WriteLine("sdsd");
+                int inta = int.MaxValue;
+                int inta2 = inta++;
+            }
+            catch (DivideByZeroException ex)
+            {
+                //  throw new Exception("asdasd", ex);                     Повторная генерация исключения с определённым сообщением
+                WriteLine("Деление на 0");
+                ex.ToString();
+            }
+            catch (OverflowException)
+            {
+                WriteLine("Переполнение");
+            }
+            catch
+            {
+                WriteLine("Общее исключение");
+            }
+            finally
+            {
+                WriteLine("Завершено");
+            }
+            Otstup();
+
+
+            using (FileStream fs = File.Create("text.txt"))
+            {
+                byte[] vs = new UTF8Encoding(true).GetBytes("This is amarica\nama\nri");
+                fs.Write(vs, 0, vs.Length);
+            }
+
+            using (StreamReader sr = File.OpenText("text.txt"))
+            {
+                string s = string.Empty;
+                while ((s = sr.ReadLine()) != null)
+                    WriteLine(s);
+            }
+            Otstup();
+
+
+            foreach (int fib in Fibs(6))                      //ИТЕРАТОР
+                Write("{0}\t", fib);
+            WriteLine();
+
+            foreach (string str in Foo(false))
+                Write("{0}\t", str);
+            WriteLine();
+
+            foreach (string str in Foo(true))
+                Write("{0}\t", str);
+            WriteLine();
+
+            foreach (int fib in EvenFib(Fibs(20)))
+                Write("{0}\t", fib);
+            Otstup();
+
+
+            Note B = new Note(2);
+            Note A = new Note(2);
+            A += 2;                                       //ПЕРЕОПРЕДЕЛЁННЫЙ ОПЕРАТОР +
+            WriteLine(A.value);
+            Otstup();
+
+            WriteLine("Pdbas".IsCapitalized());          //РАСШИРЯЮЩИЙ МЕТОД
+            WriteLine("Pdbas".IsCapitalizedR());         //РАСШИРЯЮЩИЙ МЕДО ИЗ ДРУГОГО ПРОСТРАНСТВА ИМЁН
+            Otstup();
+
+
+
+            var dude = new { Name = "Bob", Age = 23 };      //АНОНИМНЫЙ ТИП
+            int Age = 23;
+            var dude2 = new { Name = "Carl", Age, Age.ToString().Length };
+
+            var dudes = new[]
+            {
+                new {Name = "First", Age = 30},
+                new {Name = "Second", Age = 40}
+            };
+            WriteLine(dudes[0].Name);
+            Otstup();
+
+
+            dynamic d = new Duck();     //ДИНАМИЧНОЕ СВЯЗЫВАНИЕ (СПЕЦИАЛЬНОЕ ЧЕРЕЗ IDMOP)
+            d.Quack();
+            d.Waddle();
+            d.Duak();
+            WriteLine(Mean(5, 9.5));     //ЯЗЫКОВОЕ СВЯЗЫВАНИЕ
+            Otstup();
+
+            dynamic Dynamic = "hello";
+            WriteLine(Dynamic.GetType());
+            Dynamic = 123;
+            WriteLine(Dynamic.GetType());
+            Otstup();
+
+
+            Paft();                     //АТРИБУТЫ информации о вызывающем объекте
+            AtrChange atrChange = new AtrChange();
+            atrChange.CustomerName = "First";
+            atrChange.CustomerName = "Second";
+            Otstup();
+
+
+
+            int[,] bitmap = { { 0x101010, 0x808080, 0xFFFFFF }, { 0x101010, 0x808080, 0xFFFFFF } };
+            for (int i = 0; i < 2; i++)
+            {
+                for (int j = 0; j < 3; j++)
+                    Write(bitmap[i, j] + " ");
+                WriteLine();
+            }
+            WriteLine();
+            BlueFilter(bitmap);
+            for (int i = 0; i < 2; i++)
+            {
+                for (int j = 0; j < 3; j++)
+                    Write(bitmap[i, j] + " ");
+                WriteLine();
+            }
+            WriteLine();
+            WriteLine(int.MaxValue + "\n" + 0x7FFFFFFF);
+            new UnsafeClass("sfsd sfasdf");
+            Otstup();
+
+            MyClass mc = new MyClass(5);
+            mc.Foo();
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+            Otstup(3);
+            int[] array = { 1, 6, 4, 0, 2 };
+            quicksort(array, 0, 4);
+
+            foreach (int i in array)
+                Write("{0} ", i);
+            ReadKey();
+        }
+
+        static int Square(int x) => x *= x;
+        static object Square() => 10;
+        static int Sqrt(int x) => (int)Math.Sqrt(x);
+        static int Square2(ref int x) => x *= x;
+        static bool Check(int x) => (x & (x - 1)) == 0;
+        static string Dobavka(string str) => str + "123";
+        static string Stringa() => "hello";
+        static void Otstup() { WriteLine("\n"); }
+        static void Otstup(int x)
+        {
+            for (int i = 0; i <= x; i++) WriteLine();
+        }
+
+        public class Util
+        {
+            //           public static void Transform(int[] values, Transformer t)
+            public static void Transform<T>(T[] values, Func<T, T> t)
+            {
+                for (int i = 0; i < values.Length; i++)
+                    values[i] = t(values[i]);
+            }
+
+            public static void HardWork(ProgressReporter p)
+            {
+                for (int i = 0; i <= 10; i++)
+                {
+                    p(i * 10);
+                    System.Threading.Thread.Sleep(10);
+                }
+            }
+        }
+
+        public class Stock
+        {
+            decimal price;
+            string symbol;
+            public Stock(string symbol) { this.symbol = symbol; }
+            public event PriceChangedH PChanged;
+            public decimal Price
+            {
+                get { return price; }
+                set
+                {
+                    if (price == value) return;         // Exit if nothing has changed
+                    decimal oldPrice = price;
+                    price = value;
+                    if (PChanged != null)               // If invocation list not empty,
+                        PChanged(oldPrice, price);      // fire event.
+                }
+            }
+        }
+
+        public class Stock2
+        {
+            decimal price;
+            string symbol;
+            public Stock2(string symbol) { this.symbol = symbol; }
+            public event EventHandler<PriceCEventArgs> PChanged;
+            protected virtual void OnPChanged(PriceCEventArgs e)
+            {
+                PChanged?.Invoke(this, e);
+            }
+            public decimal Price
+            {
+                get { return price; }
+                set
+                {
+                    if (price == value) return;         // Exit if nothing has changed
+                    decimal oldPrice = price;
+                    price = value;
+                    OnPChanged(new PriceCEventArgs(oldPrice, price));
+                }
+            }
+        }
+        static void ReportPrice(decimal oldPrice, decimal newPrice) => WriteLine("Price changed from " + oldPrice + " to " + newPrice);
+
+        public class PriceCEventArgs : EventArgs
+        {
+            public readonly decimal LastPrice;
+            public readonly decimal NewPrice;
+            public PriceCEventArgs(decimal lPr, decimal nPr)
+            {
+                LastPrice = lPr;
+                NewPrice = nPr;
+            }
+        }
+
+        static void PriceChn(object source, PriceCEventArgs e)
+        {
+            if (e.LastPrice != 0)
+            {
+                if ((e.NewPrice - e.LastPrice) / e.LastPrice > 0.1M) WriteLine("Увеличение цены более чем на 10%");
+                else ReportPrice(e.LastPrice, e.NewPrice);
+            }
+            else ReportPrice(e.LastPrice, e.NewPrice);
+        }
+
+        public class Stock3
+        {
+            string str;
+            decimal price;
+            public Stock3(string str) { this.str = str; }
+            public event EventHandler ChangedPrice;
+            protected virtual void OnChangedPrice(EventArgs e)
+            {
+                ChangedPrice?.Invoke(this, e);
+            }
+            public decimal Price
+            {
+                get { return price; }
+                set
+                {
+                    if (price == value) return;
+                    price = value;
+                    OnChangedPrice(EventArgs.Empty);
+                }
+            }
+        }
+
+        static void Price3Stock(object sender, EventArgs args)
+        {
+            WriteLine("Новая цена " + ((Stock3)sender).Price);
+        }
+
+        public class Testo
+        {
+            int x;
+            public int X
+            {
+                get { return x; }
+                set
+                {
+                    if (x == value) return;
+                    if (x > value)
+                    {
+                        int temp = x;
+                        x = value;
+                        WriteLine("X уменьшился с {0} до {1}", temp, x);
+                    }
+                    if (x < value)
+                    {
+                        int temp = x;
+                        x = value;
+                        WriteLine("X увеличился с {0} до {1}", temp, x);
+                    }
+                }
+            }
+        }
+
+        static void Progress(int percentComplete) => Write(percentComplete);
+        static void Progress2(int percentComplete) => WriteLine(" выполнено");
+
+        static IEnumerable<int> Fibs(int fibCount)                             //ПЕРЕЧИСЛИТЕЛЬ
+        {
+            for (int i = 0, prev = 1, cur = 1; i < fibCount; i++)
+            {
+                yield return prev;
+                int nfib = prev + cur;
+                prev = cur;
+                cur = nfib;
+            }
+        }
+
+        static IEnumerable<string> Foo(bool st)
+        {
+            yield return "one";
+            yield return "two";
+            if (st)
+                yield break;
+            yield return "three";
+        }
+
+        static IEnumerable<int> EvenFib(IEnumerable<int> fb)
+        {
+            foreach (int x in fb)
+                if ((x % 2) == 0)
+                    yield return x;
+        }
+
+        public struct Note                      //ПЕРЕГРУЗКА ОПЕРАТОРА + В СТРУКТУРЕ
+        {
+            public int value;
+            public Note(int sem) { value = sem; }
+            public static Note operator +(Note x, int tone) => new Note(x.value + tone);
+        }
+
+
+        public class Duck : DynamicObject       //СПЕЦИАЛЬНОЕ ДИНАМИЧЕСКОЕ СВЯЗЫВАНИЕ ЧЕРЕЗ IDMOP
+        {
+            public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
+            {
+                if (binder.Name == "Duak")
+                {
+                    WriteLine("Quak Quak");
+                    result = null;
+                    return true;
+                }
+                WriteLine(binder.Name + " method");
+                result = null;
+                return true;
+            }
+        }
+
+        static dynamic Mean(dynamic x, dynamic y) => x * y / 2; //ЯЗЫКОВОЕ СВЯЗЫВАНИЕ
+
+        static void Paft(
+         [CallerMemberName] string memberName = null,       //АТРИБУТ ИМЯ ВЫЗЫВАЮЩЕГО КОМПОНЕНТА (main)
+         [CallerFilePath] string filePath = null,           //АТРИБУТ ПУТИ ФАЙЛА
+         [CallerLineNumber] int lineNumber = 0)             //АТРИБУТ НОМЕРА СТРОКИ ВЫЗВАВШЕЙ ФУНКЦИИ
+        {
+            WriteLine(memberName);
+            WriteLine(filePath);
+            WriteLine(lineNumber);
+        }
+
+        public class AtrChange : INotifyPropertyChanged
+        {
+            public event PropertyChangedEventHandler PropertyChanged = delegate { };
+            void RaisePropertyChanged([CallerMemberName] string propertyName = null)
+            {
+                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
+            }
+            string customerName;
+            public string CustomerName
+            {
+                get { return customerName; }
+                set
+                {
+                    if (value == customerName) return;
+                    customerName = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+
+        unsafe static void BlueFilter(int[,] bitmap)       //НЕБЕЗОПАСНЫЙ КОД И УКАЗАТЕЛИ
+        {
+            int length = bitmap.Length;
+            fixed (int* b = bitmap)
+            {
+                int* p = b;
+                for (int i = 0; i < length; i++)
+                    *p++ &= 0xFF;
+            }
+        }
+
+        unsafe struct UnsafeUnicodeString
+        {
+            public short Length;
+            public fixed byte Buffer[30];
+        }
+
+        unsafe class UnsafeClass
+        {
+            UnsafeUnicodeString uus;
+            public UnsafeClass(string s)
+            {
+                uus.Length = (short)s.Length;
+                fixed (byte* p = uus.Buffer)
+                    for (int i = 0; i < s.Length; i++)
+                        p[i] = (byte)s[i];
+            }
+        }
+
+        unsafe static void Zap(void* memory, int byteCount)
+        {
+            byte* b = (byte*)memory;
+            for (int i = 0; i < byteCount; i++)
+                *b++ = 0;
+        }
+
+        public class MyClass
+        {
+            int x;
+            public MyClass(int f) => x = f;
+            public void Foo()
+            {
+#if DEBUG && TESTING && !SMTHELSE               //ДИРЕКТИВЫ ПРЕПРОЦЕССОРА
+                WriteLine("{0} ???",x);
+#endif
+
+#if DEBUG
+                WriteLine("DEBUG");
+#endif
+            }
+        }
+
+
+        public class MyClass2
+        {
+            int x;
+            public MyClass2(int f) => x = f;
+
+            //XML документакция
+
+            /// <summary>
+            /// Запрашивает переменную
+            /// </summary>
+
+            public void Foo()
+            {
+                WriteLine("{0} ???", x);
+            }
+
+            
+        }
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+        static int partition<T>(T[] m, int a, int b) where T : IComparable<T>
+        {
+            int i = a;
+            for (int j = a; j <= b; j++)         // просматриваем с a по b
+            {
+                if (m[j].CompareTo(m[b]) <= 0)  // если элемент m[j] не превосходит m[b],
+                {
+                    T t = m[i];                  // меняем местами m[j] и m[a], m[a+1], m[a+2] и так далее...
+                    m[i] = m[j];                 // то есть переносим элементы меньшие m[b] в начало,
+                    m[j] = t;                    // а затем и сам m[b] «сверху»
+                    i++;                         // таким образом последний обмен: m[b] и m[i], после чего i++
+                }
+            }
+            return i - 1;                        // в индексе i хранится <новая позиция элемента m[b]> + 1
+        }
+
+        static void quicksort<T>(T[] m, int a, int b) where T : IComparable<T>// a - начало подмножества, b - конец
+        {                                        // для первого вызова: a = 0, b = <элементов в массиве> - 1
+            if (a >= b) return;
+            int c = partition(m, a, b);
+            quicksort(m, a, c - 1);
+            quicksort(m, c + 1, b);
+        }
+
+    }
+
+    public static class StringHelper                            //РАСШИРЯЮЩИЙ МЕТОД
+    {
+        public static bool IsCapitalized(this string s)
+        {
+            if (string.IsNullOrEmpty(s)) return false;
+            return char.IsUpper(s[0]);
+        }
+    }
+
+        
+
+            
+
+        
+
+    delegate int Transformer(int x);                           //ДЕЛЕГАТ
+    delegate int Transformer2(int x, int y);
+    delegate bool Check(int x);
+    delegate void ProgressReporter(int percentComplete);
+    delegate T Transformer<T>(T arg);
+    delegate int TransformerR(ref int x);
+    delegate object ObjectD();
+    delegate void PriceChangedH(decimal oldPrice, decimal newPrice);
+    delegate void EventHandler<TEventArgs>(object source, TEventArgs e) where TEventArgs : EventArgs;
+
+    delegate TResult Func<out TResult>();                     //ДЕЛЕГАТЫ FUNC И ACTION (могут принимать до 16 аргументов)
+    delegate TResult Func<in T, out TResult>(T arg);
+    delegate TResult Func<in T1, in T2, out TResult>(T1 arg1, T2 arg2);
+
+    delegate void Action();
+    delegate void Action<in T>(T arg);
+    delegate void Action<in T1, in T2>(T1 arg1, T2 arg2);
+
+
+
+
+}
+
+
+namespace RandomNamespace
+{
+    public static class StringHelper                            //РАСШИРЯЮЩИЙ МЕТОД
+    {
+        public static bool IsCapitalizedR(this string s)
+        {
+            if (string.IsNullOrEmpty(s)) return false;
+            return char.IsUpper(s[0]);
+        }
+    }
+}
--- a/chapter)/bin/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/bin/Debug/netcoreapp2.0/test(4th
@ -0,0 +1,23 @@
+{
+  "runtimeTarget": {
+    "name": ".NETCoreApp,Version=v2.0",
+    "signature": "da39a3ee5e6b4b0d3255bfef95601890afd80709"
+  },
+  "compilationOptions": {},
+  "targets": {
+    ".NETCoreApp,Version=v2.0": {
+      "test(4th chapter)/1.0.0": {
+        "runtime": {
+          "test(4th chapter).dll": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "test(4th chapter)/1.0.0": {
+      "type": "project",
+      "serviceable": false,
+      "sha512": ""
+    }
+  }
+}
--- a/chapter)/bin/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/bin/Debug/netcoreapp2.0/test(4th
--- a/chapter)/bin/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/bin/Debug/netcoreapp2.0/test(4th
--- a/chapter)/bin/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/bin/Debug/netcoreapp2.0/test(4th
@ -0,0 +1,9 @@
+{
+  "runtimeOptions": {
+    "additionalProbingPaths": [
+      "C:\\Users\\Trim\\.dotnet\\store\\|arch|\\|tfm|",
+      "C:\\Users\\Trim\\.nuget\\packages",
+      "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+    ]
+  }
+}
--- a/chapter)/bin/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/bin/Debug/netcoreapp2.0/test(4th
@ -0,0 +1,9 @@
+{
+  "runtimeOptions": {
+    "tfm": "netcoreapp2.0",
+    "framework": {
+      "name": "Microsoft.NETCore.App",
+      "version": "2.0.0"
+    }
+  }
+}
--- a/chapter)/bin/Debug/netcoreapp2.0/text.txt
+++ b/chapter)/bin/Debug/netcoreapp2.0/text.txt
@ -0,0 +1,3 @@
+This is amarica
+ama
+ri
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
@ -0,0 +1,23 @@
+//------------------------------------------------------------------------------
+// <auto-generated>
+//     Этот код создан программой.
+//     Исполняемая версия:4.0.30319.42000
+//
+//     Изменения в этом файле могут привести к неправильной работе и будут потеряны в случае
+//     повторной генерации кода.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Reflection;
+
+[assembly: System.Reflection.AssemblyCompanyAttribute("test(4th chapter)")]
+[assembly: System.Reflection.AssemblyConfigurationAttribute("Debug")]
+[assembly: System.Reflection.AssemblyFileVersionAttribute("1.0.0.0")]
+[assembly: System.Reflection.AssemblyInformationalVersionAttribute("1.0.0")]
+[assembly: System.Reflection.AssemblyProductAttribute("test(4th chapter)")]
+[assembly: System.Reflection.AssemblyTitleAttribute("test(4th chapter)")]
+[assembly: System.Reflection.AssemblyVersionAttribute("1.0.0.0")]
+
+// Создано классом WriteCodeFragment MSBuild.
+
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
@ -0,0 +1 @@
+0b85d1861af4b2cc701b8cebf78e9cf02f11d596
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
@ -0,0 +1 @@
+7f46248012612a07a4b22a9046fc120e7f030a0f
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
@ -0,0 +1,11 @@
+E:\кк\прог\test(4th chapter)\test(4th chapter)\bin\Debug\netcoreapp2.0\test(4th chapter).deps.json
+E:\кк\прог\test(4th chapter)\test(4th chapter)\bin\Debug\netcoreapp2.0\test(4th chapter).runtimeconfig.json
+E:\кк\прог\test(4th chapter)\test(4th chapter)\bin\Debug\netcoreapp2.0\test(4th chapter).runtimeconfig.dev.json
+E:\кк\прог\test(4th chapter)\test(4th chapter)\bin\Debug\netcoreapp2.0\test(4th chapter).dll
+E:\кк\прог\test(4th chapter)\test(4th chapter)\bin\Debug\netcoreapp2.0\test(4th chapter).pdb
+E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\Debug\netcoreapp2.0\test(4th chapter).csprojAssemblyReference.cache
+E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\Debug\netcoreapp2.0\test(4th chapter).csproj.CoreCompileInputs.cache
+E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\Debug\netcoreapp2.0\test(4th chapter).AssemblyInfoInputs.cache
+E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\Debug\netcoreapp2.0\test(4th chapter).AssemblyInfo.cs
+E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\Debug\netcoreapp2.0\test(4th chapter).dll
+E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\Debug\netcoreapp2.0\test(4th chapter).pdb
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
--- a/chapter)/obj/Debug/netcoreapp2.0/test(4th
+++ b/chapter)/obj/Debug/netcoreapp2.0/test(4th
--- a/chapter)/obj/project.assets.json
+++ b/chapter)/obj/project.assets.json
@ -0,0 +1,721 @@
+{
+  "version": 3,
+  "targets": {
+    ".NETCoreApp,Version=v2.0": {
+      "Microsoft.NETCore.App/2.0.0": {
+        "type": "package",
+        "dependencies": {
+          "Microsoft.NETCore.DotNetHostPolicy": "2.0.0",
+          "Microsoft.NETCore.Platforms": "2.0.0",
+          "NETStandard.Library": "2.0.0"
+        },
+        "compile": {
+          "ref/netcoreapp2.0/Microsoft.CSharp.dll": {},
+          "ref/netcoreapp2.0/Microsoft.VisualBasic.dll": {},
+          "ref/netcoreapp2.0/Microsoft.Win32.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.AppContext.dll": {},
+          "ref/netcoreapp2.0/System.Buffers.dll": {},
+          "ref/netcoreapp2.0/System.Collections.Concurrent.dll": {},
+          "ref/netcoreapp2.0/System.Collections.Immutable.dll": {},
+          "ref/netcoreapp2.0/System.Collections.NonGeneric.dll": {},
+          "ref/netcoreapp2.0/System.Collections.Specialized.dll": {},
+          "ref/netcoreapp2.0/System.Collections.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.Annotations.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.Composition.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.DataAnnotations.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.EventBasedAsync.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.TypeConverter.dll": {},
+          "ref/netcoreapp2.0/System.ComponentModel.dll": {},
+          "ref/netcoreapp2.0/System.Configuration.dll": {},
+          "ref/netcoreapp2.0/System.Console.dll": {},
+          "ref/netcoreapp2.0/System.Core.dll": {},
+          "ref/netcoreapp2.0/System.Data.Common.dll": {},
+          "ref/netcoreapp2.0/System.Data.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.Contracts.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.Debug.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.DiagnosticSource.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.FileVersionInfo.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.Process.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.StackTrace.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.TextWriterTraceListener.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.Tools.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.TraceSource.dll": {},
+          "ref/netcoreapp2.0/System.Diagnostics.Tracing.dll": {},
+          "ref/netcoreapp2.0/System.Drawing.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.Drawing.dll": {},
+          "ref/netcoreapp2.0/System.Dynamic.Runtime.dll": {},
+          "ref/netcoreapp2.0/System.Globalization.Calendars.dll": {},
+          "ref/netcoreapp2.0/System.Globalization.Extensions.dll": {},
+          "ref/netcoreapp2.0/System.Globalization.dll": {},
+          "ref/netcoreapp2.0/System.IO.Compression.FileSystem.dll": {},
+          "ref/netcoreapp2.0/System.IO.Compression.ZipFile.dll": {},
+          "ref/netcoreapp2.0/System.IO.Compression.dll": {},
+          "ref/netcoreapp2.0/System.IO.FileSystem.DriveInfo.dll": {},
+          "ref/netcoreapp2.0/System.IO.FileSystem.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.IO.FileSystem.Watcher.dll": {},
+          "ref/netcoreapp2.0/System.IO.FileSystem.dll": {},
+          "ref/netcoreapp2.0/System.IO.IsolatedStorage.dll": {},
+          "ref/netcoreapp2.0/System.IO.MemoryMappedFiles.dll": {},
+          "ref/netcoreapp2.0/System.IO.Pipes.dll": {},
+          "ref/netcoreapp2.0/System.IO.UnmanagedMemoryStream.dll": {},
+          "ref/netcoreapp2.0/System.IO.dll": {},
+          "ref/netcoreapp2.0/System.Linq.Expressions.dll": {},
+          "ref/netcoreapp2.0/System.Linq.Parallel.dll": {},
+          "ref/netcoreapp2.0/System.Linq.Queryable.dll": {},
+          "ref/netcoreapp2.0/System.Linq.dll": {},
+          "ref/netcoreapp2.0/System.Net.Http.dll": {},
+          "ref/netcoreapp2.0/System.Net.HttpListener.dll": {},
+          "ref/netcoreapp2.0/System.Net.Mail.dll": {},
+          "ref/netcoreapp2.0/System.Net.NameResolution.dll": {},
+          "ref/netcoreapp2.0/System.Net.NetworkInformation.dll": {},
+          "ref/netcoreapp2.0/System.Net.Ping.dll": {},
+          "ref/netcoreapp2.0/System.Net.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.Net.Requests.dll": {},
+          "ref/netcoreapp2.0/System.Net.Security.dll": {},
+          "ref/netcoreapp2.0/System.Net.ServicePoint.dll": {},
+          "ref/netcoreapp2.0/System.Net.Sockets.dll": {},
+          "ref/netcoreapp2.0/System.Net.WebClient.dll": {},
+          "ref/netcoreapp2.0/System.Net.WebHeaderCollection.dll": {},
+          "ref/netcoreapp2.0/System.Net.WebProxy.dll": {},
+          "ref/netcoreapp2.0/System.Net.WebSockets.Client.dll": {},
+          "ref/netcoreapp2.0/System.Net.WebSockets.dll": {},
+          "ref/netcoreapp2.0/System.Net.dll": {},
+          "ref/netcoreapp2.0/System.Numerics.Vectors.dll": {},
+          "ref/netcoreapp2.0/System.Numerics.dll": {},
+          "ref/netcoreapp2.0/System.ObjectModel.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.DispatchProxy.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.Emit.ILGeneration.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.Emit.Lightweight.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.Emit.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.Extensions.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.Metadata.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.TypeExtensions.dll": {},
+          "ref/netcoreapp2.0/System.Reflection.dll": {},
+          "ref/netcoreapp2.0/System.Resources.Reader.dll": {},
+          "ref/netcoreapp2.0/System.Resources.ResourceManager.dll": {},
+          "ref/netcoreapp2.0/System.Resources.Writer.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.CompilerServices.VisualC.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Extensions.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Handles.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.InteropServices.RuntimeInformation.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.InteropServices.WindowsRuntime.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.InteropServices.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Loader.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Numerics.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Serialization.Formatters.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Serialization.Json.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Serialization.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Serialization.Xml.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.Serialization.dll": {},
+          "ref/netcoreapp2.0/System.Runtime.dll": {},
+          "ref/netcoreapp2.0/System.Security.Claims.dll": {},
+          "ref/netcoreapp2.0/System.Security.Cryptography.Algorithms.dll": {},
+          "ref/netcoreapp2.0/System.Security.Cryptography.Csp.dll": {},
+          "ref/netcoreapp2.0/System.Security.Cryptography.Encoding.dll": {},
+          "ref/netcoreapp2.0/System.Security.Cryptography.Primitives.dll": {},
+          "ref/netcoreapp2.0/System.Security.Cryptography.X509Certificates.dll": {},
+          "ref/netcoreapp2.0/System.Security.Principal.dll": {},
+          "ref/netcoreapp2.0/System.Security.SecureString.dll": {},
+          "ref/netcoreapp2.0/System.Security.dll": {},
+          "ref/netcoreapp2.0/System.ServiceModel.Web.dll": {},
+          "ref/netcoreapp2.0/System.ServiceProcess.dll": {},
+          "ref/netcoreapp2.0/System.Text.Encoding.Extensions.dll": {},
+          "ref/netcoreapp2.0/System.Text.Encoding.dll": {},
+          "ref/netcoreapp2.0/System.Text.RegularExpressions.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Overlapped.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Tasks.Dataflow.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Tasks.Extensions.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Tasks.Parallel.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Tasks.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Thread.dll": {},
+          "ref/netcoreapp2.0/System.Threading.ThreadPool.dll": {},
+          "ref/netcoreapp2.0/System.Threading.Timer.dll": {},
+          "ref/netcoreapp2.0/System.Threading.dll": {},
+          "ref/netcoreapp2.0/System.Transactions.Local.dll": {},
+          "ref/netcoreapp2.0/System.Transactions.dll": {},
+          "ref/netcoreapp2.0/System.ValueTuple.dll": {},
+          "ref/netcoreapp2.0/System.Web.HttpUtility.dll": {},
+          "ref/netcoreapp2.0/System.Web.dll": {},
+          "ref/netcoreapp2.0/System.Windows.dll": {},
+          "ref/netcoreapp2.0/System.Xml.Linq.dll": {},
+          "ref/netcoreapp2.0/System.Xml.ReaderWriter.dll": {},
+          "ref/netcoreapp2.0/System.Xml.Serialization.dll": {},
+          "ref/netcoreapp2.0/System.Xml.XDocument.dll": {},
+          "ref/netcoreapp2.0/System.Xml.XPath.XDocument.dll": {},
+          "ref/netcoreapp2.0/System.Xml.XPath.dll": {},
+          "ref/netcoreapp2.0/System.Xml.XmlDocument.dll": {},
+          "ref/netcoreapp2.0/System.Xml.XmlSerializer.dll": {},
+          "ref/netcoreapp2.0/System.Xml.dll": {},
+          "ref/netcoreapp2.0/System.dll": {},
+          "ref/netcoreapp2.0/WindowsBase.dll": {},
+          "ref/netcoreapp2.0/mscorlib.dll": {},
+          "ref/netcoreapp2.0/netstandard.dll": {}
+        },
+        "build": {
+          "build/netcoreapp2.0/Microsoft.NETCore.App.props": {},
+          "build/netcoreapp2.0/Microsoft.NETCore.App.targets": {}
+        }
+      },
+      "Microsoft.NETCore.DotNetAppHost/2.0.0": {
+        "type": "package"
+      },
+      "Microsoft.NETCore.DotNetHostPolicy/2.0.0": {
+        "type": "package",
+        "dependencies": {
+          "Microsoft.NETCore.DotNetHostResolver": "2.0.0"
+        }
+      },
+      "Microsoft.NETCore.DotNetHostResolver/2.0.0": {
+        "type": "package",
+        "dependencies": {
+          "Microsoft.NETCore.DotNetAppHost": "2.0.0"
+        }
+      },
+      "Microsoft.NETCore.Platforms/2.0.0": {
+        "type": "package",
+        "compile": {
+          "lib/netstandard1.0/_._": {}
+        },
+        "runtime": {
+          "lib/netstandard1.0/_._": {}
+        }
+      },
+      "NETStandard.Library/2.0.0": {
+        "type": "package",
+        "dependencies": {
+          "Microsoft.NETCore.Platforms": "1.1.0"
+        },
+        "compile": {
+          "lib/netstandard1.0/_._": {}
+        },
+        "runtime": {
+          "lib/netstandard1.0/_._": {}
+        },
+        "build": {
+          "build/netstandard2.0/NETStandard.Library.targets": {}
+        }
+      }
+    }
+  },
+  "libraries": {
+    "Microsoft.NETCore.App/2.0.0": {
+      "sha512": "/mzXF+UtZef+VpzzN88EpvFq5U6z4rj54ZMq/J968H6pcvyLOmcupmTRpJ3CJm8ILoCGh9WI7qpDdiKtuzswrQ==",
+      "type": "package",
+      "path": "microsoft.netcore.app/2.0.0",
+      "files": [
+        "LICENSE.TXT",
+        "Microsoft.NETCore.App.versions.txt",
+        "THIRD-PARTY-NOTICES.TXT",
+        "build/netcoreapp2.0/Microsoft.NETCore.App.PlatformManifest.txt",
+        "build/netcoreapp2.0/Microsoft.NETCore.App.props",
+        "build/netcoreapp2.0/Microsoft.NETCore.App.targets",
+        "microsoft.netcore.app.2.0.0.nupkg.sha512",
+        "microsoft.netcore.app.nuspec",
+        "ref/netcoreapp/_._",
+        "ref/netcoreapp2.0/Microsoft.CSharp.dll",
+        "ref/netcoreapp2.0/Microsoft.CSharp.xml",
+        "ref/netcoreapp2.0/Microsoft.VisualBasic.dll",
+        "ref/netcoreapp2.0/Microsoft.VisualBasic.xml",
+        "ref/netcoreapp2.0/Microsoft.Win32.Primitives.dll",
+        "ref/netcoreapp2.0/Microsoft.Win32.Primitives.xml",
+        "ref/netcoreapp2.0/System.AppContext.dll",
+        "ref/netcoreapp2.0/System.AppContext.xml",
+        "ref/netcoreapp2.0/System.Buffers.dll",
+        "ref/netcoreapp2.0/System.Buffers.xml",
+        "ref/netcoreapp2.0/System.Collections.Concurrent.dll",
+        "ref/netcoreapp2.0/System.Collections.Concurrent.xml",
+        "ref/netcoreapp2.0/System.Collections.Immutable.dll",
+        "ref/netcoreapp2.0/System.Collections.Immutable.xml",
+        "ref/netcoreapp2.0/System.Collections.NonGeneric.dll",
+        "ref/netcoreapp2.0/System.Collections.NonGeneric.xml",
+        "ref/netcoreapp2.0/System.Collections.Specialized.dll",
+        "ref/netcoreapp2.0/System.Collections.Specialized.xml",
+        "ref/netcoreapp2.0/System.Collections.dll",
+        "ref/netcoreapp2.0/System.Collections.xml",
+        "ref/netcoreapp2.0/System.ComponentModel.Annotations.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.Annotations.xml",
+        "ref/netcoreapp2.0/System.ComponentModel.Composition.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.DataAnnotations.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.EventBasedAsync.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.EventBasedAsync.xml",
+        "ref/netcoreapp2.0/System.ComponentModel.Primitives.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.Primitives.xml",
+        "ref/netcoreapp2.0/System.ComponentModel.TypeConverter.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.TypeConverter.xml",
+        "ref/netcoreapp2.0/System.ComponentModel.dll",
+        "ref/netcoreapp2.0/System.ComponentModel.xml",
+        "ref/netcoreapp2.0/System.Configuration.dll",
+        "ref/netcoreapp2.0/System.Console.dll",
+        "ref/netcoreapp2.0/System.Console.xml",
+        "ref/netcoreapp2.0/System.Core.dll",
+        "ref/netcoreapp2.0/System.Data.Common.dll",
+        "ref/netcoreapp2.0/System.Data.Common.xml",
+        "ref/netcoreapp2.0/System.Data.dll",
+        "ref/netcoreapp2.0/System.Diagnostics.Contracts.dll",
+        "ref/netcoreapp2.0/System.Diagnostics.Contracts.xml",
+        "ref/netcoreapp2.0/System.Diagnostics.Debug.dll",
+        "ref/netcoreapp2.0/System.Diagnostics.Debug.xml",
+        "ref/netcoreapp2.0/System.Diagnostics.DiagnosticSource.dll",
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+        "build/netstandard2.0/ref/System.Security.Cryptography.Algorithms.dll",
+        "build/netstandard2.0/ref/System.Security.Cryptography.Csp.dll",
+        "build/netstandard2.0/ref/System.Security.Cryptography.Encoding.dll",
+        "build/netstandard2.0/ref/System.Security.Cryptography.Primitives.dll",
+        "build/netstandard2.0/ref/System.Security.Cryptography.X509Certificates.dll",
+        "build/netstandard2.0/ref/System.Security.Principal.dll",
+        "build/netstandard2.0/ref/System.Security.SecureString.dll",
+        "build/netstandard2.0/ref/System.ServiceModel.Web.dll",
+        "build/netstandard2.0/ref/System.Text.Encoding.Extensions.dll",
+        "build/netstandard2.0/ref/System.Text.Encoding.dll",
+        "build/netstandard2.0/ref/System.Text.RegularExpressions.dll",
+        "build/netstandard2.0/ref/System.Threading.Overlapped.dll",
+        "build/netstandard2.0/ref/System.Threading.Tasks.Parallel.dll",
+        "build/netstandard2.0/ref/System.Threading.Tasks.dll",
+        "build/netstandard2.0/ref/System.Threading.Thread.dll",
+        "build/netstandard2.0/ref/System.Threading.ThreadPool.dll",
+        "build/netstandard2.0/ref/System.Threading.Timer.dll",
+        "build/netstandard2.0/ref/System.Threading.dll",
+        "build/netstandard2.0/ref/System.Transactions.dll",
+        "build/netstandard2.0/ref/System.ValueTuple.dll",
+        "build/netstandard2.0/ref/System.Web.dll",
+        "build/netstandard2.0/ref/System.Windows.dll",
+        "build/netstandard2.0/ref/System.Xml.Linq.dll",
+        "build/netstandard2.0/ref/System.Xml.ReaderWriter.dll",
+        "build/netstandard2.0/ref/System.Xml.Serialization.dll",
+        "build/netstandard2.0/ref/System.Xml.XDocument.dll",
+        "build/netstandard2.0/ref/System.Xml.XPath.XDocument.dll",
+        "build/netstandard2.0/ref/System.Xml.XPath.dll",
+        "build/netstandard2.0/ref/System.Xml.XmlDocument.dll",
+        "build/netstandard2.0/ref/System.Xml.XmlSerializer.dll",
+        "build/netstandard2.0/ref/System.Xml.dll",
+        "build/netstandard2.0/ref/System.dll",
+        "build/netstandard2.0/ref/mscorlib.dll",
+        "build/netstandard2.0/ref/netstandard.dll",
+        "build/netstandard2.0/ref/netstandard.xml",
+        "lib/netstandard1.0/_._",
+        "netstandard.library.2.0.0.nupkg.sha512",
+        "netstandard.library.nuspec"
+      ]
+    }
+  },
+  "projectFileDependencyGroups": {
+    ".NETCoreApp,Version=v2.0": [
+      "Microsoft.NETCore.App >= 2.0.0"
+    ]
+  },
+  "packageFolders": {
+    "C:\\Users\\Trim\\.nuget\\packages\\": {},
+    "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder": {}
+  },
+  "project": {
+    "version": "1.0.0",
+    "restore": {
+      "projectUniqueName": "E:\\кк\\прог\\test(4th chapter)\\test(4th chapter)\\test(4th chapter).csproj",
+      "projectName": "test(4th chapter)",
+      "projectPath": "E:\\кк\\прог\\test(4th chapter)\\test(4th chapter)\\test(4th chapter).csproj",
+      "packagesPath": "C:\\Users\\Trim\\.nuget\\packages\\",
+      "outputPath": "E:\\кк\\прог\\test(4th chapter)\\test(4th chapter)\\obj\\",
+      "projectStyle": "PackageReference",
+      "fallbackFolders": [
+        "C:\\Program Files\\dotnet\\sdk\\NuGetFallbackFolder"
+      ],
+      "configFilePaths": [
+        "C:\\Users\\Trim\\AppData\\Roaming\\NuGet\\NuGet.Config",
+        "C:\\Program Files (x86)\\NuGet\\Config\\Microsoft.VisualStudio.Offline.config"
+      ],
+      "originalTargetFrameworks": [
+        "netcoreapp2.0"
+      ],
+      "sources": {
+        "C:\\Program Files (x86)\\Microsoft SDKs\\NuGetPackages\\": {},
+        "https://api.nuget.org/v3/index.json": {}
+      },
+      "frameworks": {
+        "netcoreapp2.0": {
+          "projectReferences": {}
+        }
+      },
+      "warningProperties": {
+        "warnAsError": [
+          "NU1605"
+        ]
+      }
+    },
+    "frameworks": {
+      "netcoreapp2.0": {
+        "dependencies": {
+          "Microsoft.NETCore.App": {
+            "target": "Package",
+            "version": "[2.0.0, )",
+            "autoReferenced": true
+          }
+        },
+        "imports": [
+          "net461"
+        ],
+        "assetTargetFallback": true,
+        "warn": true
+      }
+    }
+  }
+}
--- a/chapter).csproj.nuget.cache
+++ b/chapter).csproj.nuget.cache
@ -0,0 +1,5 @@
+{
+  "version": 1,
+  "dgSpecHash": "5C7JvZuTi2PHfMbKA3g0XnXBtoQEZoRZULx38No64eQzZ04642Rp3RBeDFU48XKnhpnXbNXVmYbrhZEpx0OMcw==",
+  "success": true
+}
--- a/chapter).csproj.nuget.g.props
+++ b/chapter).csproj.nuget.g.props
@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <RestoreSuccess Condition=" '$(RestoreSuccess)' == '' ">True</RestoreSuccess>
+    <RestoreTool Condition=" '$(RestoreTool)' == '' ">NuGet</RestoreTool>
+    <ProjectAssetsFile Condition=" '$(ProjectAssetsFile)' == '' ">E:\кк\прог\test(4th chapter)\test(4th chapter)\obj\project.assets.json</ProjectAssetsFile>
+    <NuGetPackageRoot Condition=" '$(NuGetPackageRoot)' == '' ">$(UserProfile)\.nuget\packages\</NuGetPackageRoot>
+    <NuGetPackageFolders Condition=" '$(NuGetPackageFolders)' == '' ">C:\Users\Trim\.nuget\packages\;C:\Program Files\dotnet\sdk\NuGetFallbackFolder</NuGetPackageFolders>
+    <NuGetProjectStyle Condition=" '$(NuGetProjectStyle)' == '' ">PackageReference</NuGetProjectStyle>
+    <NuGetToolVersion Condition=" '$(NuGetToolVersion)' == '' ">4.7.0</NuGetToolVersion>
+  </PropertyGroup>
+  <PropertyGroup>
+    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
+  </PropertyGroup>
+  <ImportGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\build\netcoreapp2.0\Microsoft.NETCore.App.props" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\build\netcoreapp2.0\Microsoft.NETCore.App.props')" />
+  </ImportGroup>
+</Project>
--- a/chapter).csproj.nuget.g.targets
+++ b/chapter).csproj.nuget.g.targets
@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8" standalone="no"?>
+<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
+  </PropertyGroup>
+  <ImportGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
+    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.0\build\netstandard2.0\NETStandard.Library.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.0\build\netstandard2.0\NETStandard.Library.targets')" />
+    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\build\netcoreapp2.0\Microsoft.NETCore.App.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\build\netcoreapp2.0\Microsoft.NETCore.App.targets')" />
+  </ImportGroup>
+</Project>
--- a/chapter)/test(4th
+++ b/chapter)/test(4th
@ -0,0 +1,13 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <DocumentationFile></DocumentationFile>
+  </PropertyGroup>
+
+</Project>