Add CSharp13GrammarExercise

Author: YSGStudyHards

DotNetGuidePractice/HelloDotNetGuide/CSharp语法/CSharp13GrammarExercise.cs

@@ -0,0 +1,122 @@
+using System.Runtime.CompilerServices;
+
+namespace HelloDotNetGuide.CSharp语法
+{
+    public class CSharp13GrammarExercise
+    {
+        #region params 集合
+
+        public static void SpanDataPrintRun()
+        {
+            Span<int> originalSpan = [1, 2, 3, 4, 5];
+            SpanDataPrint(originalSpan);
+        }
+
+        public static void SpanDataPrint<T>(params Span<T> spans)
+        {
+            for (int i = 0; i < spans.Length; i++)
+            {
+                Console.WriteLine(spans[i]);
+            }
+        }
+
+        #endregion
+
+        #region 新增Lock锁对象
+
+        private object _oldLock = new object();
+        private System.Threading.Lock _newLock = new System.Threading.Lock();
+
+        public void LockTest()
+        {
+            lock (_oldLock)
+            {
+                Console.WriteLine("Old lock");
+            }
+
+
+            lock (_newLock)
+            {
+                // 传统 lock 语法（优化版）
+            }
+
+            using (_newLock.EnterScope())
+            {
+                //  作用域自动释放（推荐写法）
+            }
+
+            _newLock.Enter();
+            try
+            {
+                // 显式 Enter/Exit 调用
+            }
+            finally { _newLock.Exit(); }
+
+            if (_newLock.TryEnter())
+            {
+                try
+                {
+                    // 非阻塞尝试获取锁
+                }
+                finally { _newLock.Exit(); }
+            }
+
+        }
+
+        #endregion
+
+        #region 新的转义序列
+
+        public static void NewEscapeSequence()
+        {
+            Console.WriteLine("[31m红色文本[0m");
+
+            // C# 13 之前
+            Console.WriteLine("\u001b[31m红色文本\u001b[0m"); //输出红色文字
+
+            // C# 13 中
+            Console.WriteLine("\e[31m红色文本\e[0m");//功能相同，语法更简洁
+        }
+
+
+        #endregion
+
+        #region 隐式索引访问
+
+        public class Numbers
+        {
+            public int[] Datas { get; set; } = new int[8];
+        }
+
+        public static void ImplicitIndexAccess()
+        {
+            var countdown = new Numbers()
+            {
+                Datas =
+                {
+                   [1] = 0,
+                   [2] = 1,
+                    
+                   // 从 C# 13 开始执行下面方式赋值
+                   [^3] = 2,
+                   [^4] = 3,
+                   [^5] = 4
+                }
+            };
+        }
+
+        #endregion
+
+        #region 重载解析优先级
+
+        public class Printer
+        {
+            [OverloadResolutionPriority(1)] // 优先调用
+            public static void Print(params int[] numbers) { }
+
+            public static void Print(params ReadOnlySpan<int> numbers) { }
+        }
+
+        #endregion
+    }
+}

DotNetGuidePractice/HelloDotNetGuide/Program.cs

@@ -13,6 +13,14 @@ static void Main(string[] args)
         {
             Console.WriteLine("欢迎来到DotNetGuide练习空间！！！");
 
+            #region CSharp13GrammarExercise
+
+            CSharp13GrammarExercise.SpanDataPrintRun();
+
+            CSharp13GrammarExercise.NewEscapeSequence();
+
+            #endregion
+
             #region DictionaryExercise
 
             //DictionaryExercise.DictionaryOperation();
@@ -40,7 +48,7 @@ static void Main(string[] args)
             //LinqExercise.CountByExample();
             //LinqExercise.AggregateByExample();
             //LinqExercise.IndexExample();
-            LinqExercise.CommonMethodsInLINQ();
+            //LinqExercise.CommonMethodsInLINQ();
 
             #endregion