C＃字符串运算符重载 [英] C# String Operator Overloading

问题描述

配合儿真好 -

什么是（不包括它是否是可取的说法）超载字符串运算符<，>，<的正确方法; ？=和> =

What is the right way (excluding the argument of whether it is advisable) to overload the string operators <, >, <= and >= ?

我已经试过了五种方式周日，我去各种错误 - 我最好的射门被宣布的分部类，并从那里超载，但它不会出于某种原因。

I've tried it five ways to Sunday and I get various errors - my best shot was declaring a partial class and overloading from there, but it won't work for some reason.

namespace System
{
   public partial class String
   {
       public static Boolean operator <(String a, String b)
       {
           return a.CompareTo(b) < 0;
       }

       public static Boolean operator >(String a, String b)
       {
           return a.CompareTo(b) > 0;
       }
   }

}

}

推荐答案

字符串是一个密封类。你不能继承它，并没有原始源字符串，您不能编译一个分部类的吧。即使你在源上得到了你的手（它通过反射或者通过Visual Studio的符号下载是可能的），你仍然有问题，因为它在运行中的头等公民。

String is a sealed class. You cannot inherit from it, and without the original source for String, you cannot compile a partial class of it. Even if you got your hands on the source (it's possible via Reflector or via Visual Studio symbol download) you'd still have problems, since it's a first class citizen in the runtime.

你真的需要<和>作为字符串操作？如果是这样的...为什么不直接使用扩展方法的<？ / p>

Do you really need < and > as operators on string? If so... why not just use extension methods?

public static bool IsLessThan(this string a, string b) 
{ 
    return a.CompareTo(b) < 0; 
} 

public static bool IsGreaterThan(this string a, string b) 
{ 
    return a.CompareTo(b) > 0; 
}


// elsewhere...
foo.IsLessThan(bar); // equivalent to foo < bar

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