有如下简单的console程序

1 using System; 2  3 namespace HelloWorld 4 { 5     class Program 6     { 7         static void Main(string[] args) 8         { 9             Console.WriteLine("Main from Program");10         }11     }12 }

编译，运行：

C:\Users\yshuangj\Desktop\HelloWorld>csc Program.csMicrosoft (R) Visual C# 2005 Compiler version 8.00.50727.8745for Microsoft (R) Windows (R) 2005 Framework version 2.0.50727Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.C:\Users\yshuangj\Desktop\HelloWorld>Program.exeMain from Program

也可以指定入口Main函数，再编译，运行

1 C:\Users\yshuangj\Desktop\HelloWorld>csc Program.cs /main:HelloWorld.Program2 Microsoft (R) Visual C# 2005 Compiler version 8.00.50727.87453 for Microsoft (R) Windows (R) 2005 Framework version 2.0.507274 Copyright (C) Microsoft Corporation 2001-2005. All rights reserved.5 6 7 C:\Users\yshuangj\Desktop\HelloWorld>Program.exe8 Main from Program

这样做的目的是，在编译时，指定哪个Main函数作为入口函数，因为除Program类外，其它类也可能有一个Main函数。