Changed behavior of string.Empty (or System.String::Empty) in .NET 4.5

Question

Short version:

The C# code

typeof(string).GetField(\"Empty\").SetValue(null, \"Hello world!\");
Console.WriteLine(string.Empty);
         


        

Answer 1

I don't have an answer, juste some hint, maybe.

The only difference I see between String::Empty and System.Diagnostics.Debugger::DefaultCategory is the first one is tagged with __DynamicallyInvokableAttribute.

I dont' known the meaning of this undocumented attribute. A question about this attribute has been asked on SO: What is the __DynamicallyInvokable attribute for?

I can only suppose that this attribute is catch by the runtime to do some caching ?