添加Lesson21

C#核心/Lesson21_面向对象相关-命名空间练习/Program.cs

@@ -0,0 +1,24 @@
+namespace Lesson21_面向对象相关_命名空间练习
+{
+    namespace UI
+    {
+        class Image
+        {
+        }
+    }
+    namespace Graph
+    {
+        class Image
+        {
+        }
+    }
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+            UI.Image img1 = new UI.Image();
+            Graph.Image img2 = new Graph.Image();
+        }
+    }
+}