a

01.扩展/Extensions/BooleanExtension.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ExtensionMethods
+{
+    public static class BooleanExtension
+    {
+        public static bool Turn(this bool obj)
+        {
+            return !obj;
+        }
+    }
+}