How can I reuse expressions within LINQ statements?

Question

I like to reuse expressions for DRY reasons, but how do I reuse the expressions within a LINQ statement?

e.g.

I have

public static class MyE         


        

Answer 1

If you move from the LINQ syntactic sugar it is possible:

var goodProds = dataContext.Products.Where(MyExpressions.IsAGoodProduct());

Without it, it isn't possible.

There's nothing to stop you mixing the two styles to build a single query though.

Example:

  var goodProds = from p in dataContext.Products
                                       .Where(MyExpressions.IsAGoodProduct())
                  group p by p.Category into g 
                  select new {Category = g.Key, ProductCount = g.Group.Count()};