CODEWITHSUNDEEP
c#reflection
user152949
user152949

Reputation:

Type.GetMethod() for custom class returns NULL

I'm having troubles getting my MyClass == operator's method reference when specifying the comparison type while using Type.GetMethod(), here is my code:

public class MyClass
{
    public object Value { get; set; }

    public MyClass(object inVal = null)
    {
        Value = inVal;
    }

    public static bool operator ==(MyClass a, string b)
    {
        // If one is null, but not both, return false.
        if (((object)a == null) || ((object)b == null)) return false;

        // Return true if the fields match:
        return Convert.ToString(a.Value) == b;
    }

    public static bool operator !=(MyClass a, string b)
    {
        return !(a == b);
    }

    public static bool operator ==(MyClass a, bool b)
    {
        // If one is null, but not both, return false.
        if ((object)a == null) return false;

        // Return true if the fields match:
        return Convert.ToBoolean(a.Value) == b;
    }

    public static bool operator !=(MyClass a, bool b)
    {
        return !(a == b);
    }
}

A call to 

var methodInfo = typeof(MyClass).GetMethod("op_Equality", new Type[]  {  typeof(bool)  } )

or

var methodInfo = typeof(MyClass).GetMethod("op_Equality", new Type[]  {  typeof(string)  } )

, returns NULL, why is that? I expected a reference to the operator.

Upvotes: 0

Views: 483

Answers (2)

Steve
Steve

Reputation: 216243

The equality/inequality operators works on two types,
(in your case the class type and the bool/string type), you need to pass also the class type (in the correct order expected)

Type t1 = typeof(MyClass);
var methodInfo1 = t1.GetMethod("op_Equality", 
                  new Type[]  { t1, typeof(bool)  } );
var methodInfo2 = t1.GetMethod("op_Equality", 
                  new Type[]  { t1, typeof(string)  } );

Upvotes: 2

nvoigt
nvoigt

Reputation: 77285

The normal method expects a public instance method to look for. As yours are static methods, you should use an overload of GetType that you can pass a BindingFlags parameter of Static.

Upvotes: 1

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