String Value to variable Name using dynamics

Question

I have the following class

public class MyTestClass
{

    public string Name { get; set; }

}

and I do the following: 

dynamic myClass = new MyTestClass;

string propName = "Name";

And I want to be able to do this:

 myClass.propName = "Hello";

How can I convert the string into a propertyName using Dynamics? I know ways of doing it using reflection, but I would like to know for my knowledge if there is a way this can be achieved using dynamics or expando object?

MyTestClass doesn't have a property called propName How'll you do that using reflection? Can you show us? — Sriram Sakthivel
– Sriram Sakthivel, Commented Apr 9, 2014 at 3:00
Can you indicate more generally what you are trying to accomplish? Why do you want to dynmically add a property? — Oren Hizkiya
– Oren Hizkiya, Commented Apr 9, 2014 at 3:11
Can I understand that you are going to assign the "Hello" to a dynamic generated property of MyTestClass? — Panda Zhang
– Panda Zhang, Commented Apr 9, 2014 at 3:12
I meant doing like this: stackoverflow.com/questions/11824362/… — user1527762
– user1527762, Commented Apr 9, 2014 at 3:15

Tim Burkhart · Accepted Answer · 2014-04-09 03:41:18Z

I think you can use DynamicObject, but it would be a little bit different than what you're wanting. I am not sure that what you're wanting to do is possible in C# (definitely possible in other languages though). This is a pseudocode attempt at something (maybe not the most amazing piece of code)

public class MyDynamicObject<T> : DynamicObject {
    private T referenceObject;

    public MyDynamicObject<T>() {
        this.referenceObject = new T();
    }

    public override bool TrySetMember(SetMemberBinder binder, Object value) {
        var propertyName = // get from binder parameter
        typeof(T).SetValue(referenceObject, value);
    }

    public T Compile() {
        return referenceObject;
    }
}

Then I believe you can do something like:

var propertyName = "Name";
var dynamicObject = new MyDynamicObject<MyTestClass>();
dynamicObject[propertyName] = "Foo";
var myTestClass = dynamicObject.Compile();

Overall, I would say that you should investigate the DynamicObject functionality. The function that I overrode may not be the correct one for an array (I always forget which function to override). But you should give it a shot. If you want to see a really sweet project that uses DynamicObjects in the best way possible, check out https://github.com/markrendle/Simple.Data

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