Question

C# 4.0 introduces dynamic keyword, which will look up at run-time.

Does this mean we’ll need awkward reflection no more? If does, Can you show up an example of it?

Answer 1

We’ll still have Reflection – using ‘dynamic’ against regular CLR objects will invoke a Reflection-based dispatcher.

So – we’ll still have Reflection, but it’ll be easier to do.

Here’s an example:

// Via 'dynamic'    
dynamic dx = GetSomeCLRObject();
dx.DoSomething();
dx.SomeMember = 2;

// Via Reflection
object x = GetSomeCLRObject();
Type xt = x.GetType();
MemberInfo DoSomethingMethod = xt.GetMethod("DoSomething");
DoSomethingMethod.Invoke(x, null);
PropertyInfo SomeMemberProperty = xt.GetProperty("SomeMember");
SomeMemberProperty.SetValue(x, 2);

I don’t know about you, but I like the former. =)

In both these cases, I get no compile-time checking, no Intellisense, no IDE support – but the former case is much more expressive than the latter.