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Question

I would like to get a delegate to a property´s set function. This is how I do today:

var property = typeof(IApplicationState).GetProperty(propertyName);
var action = (Action<IApplicationState, T>)Delegate.CreateDelegate(typeof(Action<IApplicationState, T>), null, property.GetSetMethod());

This works, but then I have know the name of the property.

Can I do this without using the name? Something like this:

var action = (Action<IApplicationState, T>)Delegate.CreateDelegate(typeof(Action<IApplicationState, T>), null, IApplicationState.PROPERTY.GetSetMethod());

Answer 1

One simple option which does introduce an extra hop (but would probably have negligible performance impact) would be to just use a lambda expression:

Action<IApplicationState, T> action = (state, value) => state.Foo = value;

There's currently no way of referring to a property at compile-time in the same way as we can refer to a type with typeof - although it's on the C# team's feature request list.

EDIT: If this is in a generic method (with a type parameter of T ), it's not at all clear to me that you'll be able to use this directly, as state.Foo would presumably have to be of type T (or object perhaps). We can't really help with that aspect without more context of what you're trying to achieve.