Framework Design Guidelines: Conventions, Idioms, and Patterns for Reusable .NET Libraries by Krzysztof Cwalina and Brad Abrams is one of my favorite books. They are working on a new version, too. What would be a new Framework Design Guidelines book without a section on LINQ Best Practices when used as part of a framework API? Here is a blog post with just that type of information that covers:
- A Brief Overview of LINQ
- Extension Methods, Func<>, Action<>, and Expression<>
- Extending on LINQ
- Extending IEnumerable<>
- Extending IQueryable<>
- Implementing the Query Pattern
"Writing applications that interact with data sources, such as databases, XML documents, or Web Services such as Flickr or Amazon, is made easier in the .NET Framework 3.5 with the addition of a set of features collectively referred to as LINQ (Language-Integrated Query). In what follows, we start with a very brief overview of LINQ, followed by guidelines for designing APIs in relation to LINQ."
Jack Ma, a software developer 
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