Overload division in C#

问题:

I want to overload division operator in my C# class. So, i wrote:

public string[] operator/ (object obj) {

}

And got error: "Parser error: Overloadable unary operator excepted".
So, i cant overload that operator?
On the MSDN i don't see any example: http://msdn.microsoft.com/en-us/library/3b1ff23f.aspx
Thanks.

//i'm using MonoDevelop on Ubuntu 14.10, if it's needed.

回答1:

You can overload the division operator, but:

• It must always be a binary operator - you've only provider one operand
• It must always be static
• At least one of the operand types must be the type you're declaring it in

So for example:

using System;

class Program
{
    public static string operator/ (Program lhs, int rhs)
    {
        return "I'm divided!";
    }

    static void Main(string[] args)
    {
        Console.WriteLine(new Program() / 10);
    }
}

回答2:

The / operator is a "binary" operator, meaning that it takes two arguments: a / b. The way you've written this, it's trying to overload it as a "unary" operator, such as a++.

Something like this ought to work, assuming your class is called "MyObject".

public static string[] operator/ (MyObject mine, object obj) {
    ...
}

Usage:

object something = "hi";
string[] result = new MyObject(1) / something;