我可以扩展方法添加到现有的静态类？ [英] Can I add extension methods to an existing static class?

问题描述

我在C＃扩展方法球迷，但没有成功添加一个扩展方法静态类，如控制台。

I'm a fan of extension methods in C#, but haven't had any success adding an extension method to a static class, such as Console.

例如，如果我想添加一个扩展到控制台，所谓'WriteBlueLine'，这样我就可以去：

For example, if I want to add an extension to Console, called 'WriteBlueLine', so that I can go:

Console.WriteBlueLine("This text is blue");

我想这通过添加一个地方，公共静态方法，用控制台作为一个'这个'参数...但没有骰子！

I tried this by adding a local, public static method, with Console as a 'this' parameter... but no dice!

public static class Helpers {
    public static void WriteBlueLine(this Console c, string text)
    {
        Console.ForegroundColor = ConsoleColor.Blue;
        Console.WriteLine(text);
        Console.ResetColor();
    }
}

这并没有一个'WriteBlueLine方法添加到控制台...我做错了？或缘木求鱼？

This didn't add a 'WriteBlueLine' method to Console... am I doing it wrong? Or asking for the impossible?

推荐答案

没有。扩展方法需要一个对象的一个​​实例。不过，您可以写周围的 ConfigurationManager中接口的静态包装。如果实施包装，不需要扩展方法，因为你可以直接添加方法。

No. Extension methods require an instance of an object. You can however, write a static wrapper around the ConfigurationManager interface. If you implement the wrapper, you don't need an extension method since you can just add the method directly.

 public static class ConfigurationManagerWrapper
 {
      public static ConfigurationSection GetSection( string name )
      {
         return ConfigurationManager.GetSection( name );
      }

      .....

      public static ConfigurationSection GetWidgetSection()
      {
          return GetSection( "widgets" );
      }
 }

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