如何继承字符串类? [英] How Can I inherit the string class?

问题描述

我想继承以扩展 C# 字符串类以添加诸如 WordCount() 和其他许多方法，但我一直收到此错误:

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':无法从密封派生输入字符串"

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

有没有其他方法可以解决这个问题?我尝试使用 string 和 String 但它没有用.

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.例如，

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

使用:

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

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