尝试在字符串上重载运算符时收到错误

Question

I know this can be done in C++, but I'm not sure what to look for with this. Basically I have a string value in a custom class named Priority . What I would like to do is add a custom operator to allow Priority++ or Priority-- in which a few things happen. The operation would look like this...

public static -- ()
{
    Int32 priority = Convert.ToInt32(value);
    priority--;
    string returnValue = priority.ToString();
    return returnValue;
}

and the opposite for ++ . What I have can be found below, however I receive the error Priority is a property, but is used like a type.

Existing erred code:

public static Priority operator ++(string value)
{
    Int32 priority = Convert.ToInt32(value);
    priority--;
    string returnValue = priority.ToString();
    return returnValue;
}

Answer 1

take a step back and consider :

int i = 0;
i++;

the ++ operator here takes an int, and returns an updated int.

I have a simple class:

public class MyClass
{
    public string Test { get; set; }

    public static MyClass operator ++(MyClass myclass)
    {
        myclass.Test += " test";
        return myclass;
    }
}

the ++ operator takes a MyClass and returns an updated MyClass .

Your ++ operator needs to take a Priority object and return an updated Priority object, what gets updated is up to you.