Hello World不适用于Cloud9上的C＃

Question

如何在cloud9中为C＃引用mscorlib？

为世界你好的样本代码不起作用

using System; 

public class Hello2 
{ 
    public static void Main() 
    { 
     Console.WriteLine("Hello, World!"); 
    } 
} 

，因为它发出了以下错误：

error: expected nested-name-specifier before ‘System’ using System;
error: ‘System’ has not been declared
error: expected unqualified-id before ‘public’
public class Hello2

Answer 1

你缺少namespace

using System; 
namespace namespace_name 
{ 
    public class Hello2 
    { 
     public static void Main() 
     { 
      Console.WriteLine("Hello, World!"); 
     } 
    } 
}