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What is the best way of dynamically writing LINQ queries and Lambda expressions?
I am thinking of applications where the end user can design business logic rules, which then must be executed.
I am sorry if this is a newbie question, but it would be great to get best practices out of experience.
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Language Integrated Query (LINQ) is feature of Visual Studio that gives you the capabilities yo query on the language syntax of C#, so you will get SQL kind of queries. And Lambda expression is an anonymous function and is more of a like delegate type.
In 2010, the Dynamic Type was introduced and that gave us the ability to create dynamic lambda expressions.
The Dynamic LINQ library exposes a set of extension methods on IQueryable corresponding to the standard LINQ methods at Queryable, and which accept strings in a special syntax instead of expression trees.
The term 'Lambda expression' has derived its name from 'lambda' calculus which in turn is a mathematical notation applied for defining functions. Lambda expressions as a LINQ equation's executable part translate logic in a way at run time so it can pass on to the data source conveniently.
I cannot recommend higher than you reading through the postings of Bart De Smet (http://community.bartdesmet.net/blogs/bart/), he is really brilliant when it comes to Lambda.
His recent series covered dynamic Lambda, starting with http://community.bartdesmet.net/blogs/bart/archive/2008/08/26/to-bind-or-not-to-bind-dynamic-expression-trees-part-0.aspx
Absolutely beautiful code.
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