How to access an object's property through its interface in C#

February 17, 2022

I have a class A with a property A.A and a class B with a property B.B. Both implement the IC interface that defines the IC.C property, but do not defines A.A or B.B.

I want a method that receive an instance of A or B as a parameter and can access those properties, something like:

void MyMethod(IC obj)
{
    if (obj.GetType().Name.Equals("A"))
    {
        var v = obj.A;    // some code for access A
    }
}

Is that possible? And, is it a good idea?
Thanks!

Edited: renaming the interface as IC as suggested by @dmedine.

>Solution :

The best approach would depend on the specifics of what you are trying to do, but here are 2 options:

Pattern matching

void MyMethod(C obj)
{
    if (obj is A objAsA)
    {
        var vA = objAsA.A;
    }

    if (obj is B objAsB)
    {
        var vB = objAsB.B;
    }
}

Reflection

void MyMethod(C obj)
{
    var objType = obj.GetType();
    if (objType.Name.Equals("A"))
    {
        var prop = objType.GetProperty("A");
        var v = prop.GetValue(obj, null);
    }
}