c# - 字符串用户函数

Question

如何向字符串类型添加自定义函数

例子:

string test = "hello";

test.userFn("world");

public string userFn(strng str) {
   return " " + str;
}

Answer 1

http://msdn.microsoft.com/en-us/library/bb383977.aspx

namespace ExtensionMethods
{
    public static class MyExtensions
    {
        public static string userFn(this string str)
        {
            return " " + str;
        }
    }   
}