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Entity Framework 4.1: Expert's Cookbook by Tim Rayburn, Devlin Liles

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Improving complex where clauses

In this recipe, we will be composing queries out of reusable chunks into larger business specific queries.

Getting ready

We will be using the NuGet package manager to install the Entity Framework 4.1 assemblies.

The package installer can be found at http://nuget.org.

We will also be using a database for connecting to and updating data.

Open the Improving Complex Where Clauses solution in the included source code examples.

How to do it...

Carry out the following steps in order to accomplish this recipe.

  1. We will start by writing a test, which will query the database with a complex set of where clauses, which needs to be abstracted. Use the following code:
    using System; using System.Collections.Generic; using System.Linq; using BusinessLogic; ...

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