How to check for nulls in a deep lambda expression? [duplicate]

Answer 1

I've written an extension method which enables you to do this:

blah.GetValueOrDefault(x => x.Two.Three.Four.Foo);

It uses Expression Trees to build a nested conditional checking for nulls at each node before returning the expression value; the created expression tree is compiled to a Func and cached, so subsequent uses of the same call should run at almost native speed.

You can also pass in a default value to return if you like:

blah.GetValueOrDefault(x => x.Two.Three.Four.Foo, Foo.Empty);

I've written a blog about it here.