我要继承扩展C＃string类中添加像 WORDCOUNT方法（）和几个其他许多人，但我不断收到此错误：

I want to inherit to extend the C# string class to add methods like WordCount() and several many others but I keep getting this error:

错误1'WindowsFormsApplication2.myString'：不能从密封的派生   类型字符串

Error 1 'WindowsFormsApplication2.myString': cannot derive from sealed type 'string'

有没有其他办法可以突破这个？我试着用字符串和字符串，但没有奏效。

Is there any other way I can get past this ? I tried with string and String but it didn't work.

推荐答案

System.String是密封的，所以，不，你不能这样做。

System.String is sealed, so, no, you can't do that.

您可以创建扩展方法的。例如，

public static class MyStringExtensions
{
    public static int WordCount(this string inputString) { ... }
}

使用：

string someString = "Two Words";
int numberOfWords = someString.WordCount();