Merging Expression Trees to Reuse in Linq Queries

Reusing parts of LINQ queries is easily done by chaining methods returning IQueryable. Unfortunately that doesn’t cover some senarios like reusing member initialization lists. To handle such a situation I wrote a Merge extension method for select expressions. For this post we’ll load the data required for a list of cars and a detail view… Continue reading Merging Expression Trees to Reuse in Linq Queries

Traversing Expression Trees

The Expression<T> data type which was introduced together with LINQ is interesting. When a Func<TResult> is wrapped in an Expression<T> the code is no longer completely compiled, instead it is preserved as an expression tree that can be traversed during runtime. This is what the method ExpressionHelper.GetExpressionText() that I used in my last post Type Safe SelectList… Continue reading Traversing Expression Trees