Anonymous Types - Are there any distingushing characteristics?

Question

Is there anything to use, to determine if a type is actually a anonymous type? For example an interface, etc?

The goal is to create something like the following...

Answer 1

As I recall, there is a [CompilerGenerated] marker... 2 secs

Plus the name will be freaky, and it will be a generic type ;-p

Actually, for a "get" etc I would probably just use a static (non-extension) method.

If you just want a way to get the value from an instance of an anon-type (at a later point in time), a lambda is probably the best option - note you need a few tricks to pull this off:

    static void Main()
    {
        var foo = new { name = "John", age = 25 };
        var func = Get(foo, x => x.age);
        var bar = new { name = "Marc", age = 30 };
        int age = func(bar);
    }
    // template here is just for type inference...
    static Func Get(
        TSource template, Func lambda)
    {
        return lambda;
    }

(edit re the comment) There definitely is this attribute:

        var foo = new { A = "B" };
        Type type = foo.GetType();

        CompilerGeneratedAttribute attrib = (CompilerGeneratedAttribute) Attribute.GetCustomAttribute(
            type, typeof(CompilerGeneratedAttribute)); // non-null, therefore is compiler-generated