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LinqExtender - toolkit for creating custom LINQ providers. ============================================================= Build Requirements =================== Framework target : .net 3.5 or better. How to get started ======================= You will need a unit runner like TestDriven.Net or Galieo to get things running. You can start with the test project that contains few samples on how you can leverage the simplified expression tree to produce expected meta expression as you build your provider. There is a ExpreesionTreeVisitor class (supplied in LinqExtender.Tests) that you can include in your application along with LinqExtender.dll. This visitor class is used for walking the LinqExtender tree. The tree model is simplified in the following way: BlockExpression var query = from book in context where book.Id = 1 select book For the above query block expression will contain: 1. TypeExpression 2. LambdaExpression For complex query like the one below: var query = from book in context where (book.Id > 1) && (book.Author == "Scott" || book.Author == "John") Select book Order by book.Name asc It will produce expression similar to: 1. TypeExpression 2. LambdaExpression - Where clause 2.1 LogicalExpression - Groupings ( Left , Right) 2.1.1 Logical.Left - BinaryExpression 2.1.2 Logical.Right - LogicalExpression 3. OrderByExpression To start building a provider, all you need to do is to implement the following interface: IQueryContext<T> IEnumerable<T> Execute(Ast.Expression expression); Thus, traverse the visitor. The visitor has a lot of handy getters and methods to speed things up. You can find more references at http://weblogs.asp.net/mehfuzh. Hope that helps, Mehfuz