Based on my (limited) knowledge of expression trees, they are provided by the C# or VB.net compiler, at compilation time. As such you can only get the expression tree by calling a function which takes Expression<T> from some C# code. The C# compiler will notice that you are doing this, and will build the expression tree as part of it's other compilation.
This means that a) you can't get expression trees for things at runtime, => b) dynamic languages can't get expression trees, => c) IronRuby can't get expression trees => d) No, you can't get a method expression tree by it's name If I'm wrong on this, I'd be overjoyed, because getting an expression tree in a DLR language would be awesome :-)
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