Lambda Expression Tree Parsing

Question

I am trying to use Lambda Expressions in a project to map to a third party query API. So, I\'m parsing the Expression tree by hand.

If I pass in a lambda expression

Answer 1

To get the actual value, you need to apply the logic of the expression tree to whatever context you've got.

The whole point of expression trees is that they represent the logic as data rather than evaluating the expression. You'll need to work out what the lambda expression truly means. That may mean evaluating some parts of it against local data - you'll need to decide that for yourself. Expression trees are very powerful, but it's not a simple matter to parse and use them. (Ask anyone who's written a LINQ provider... Frans Bouma has bemoaned the difficulties several times.)