Func vs Expression - The LINQ expression node type Invoke is not supported in LINQ to Entities
I had an odd problem, the resolution of which exposed an interesting bit of information about what goes on under the C# covers that we never usually know.
I had a Linq query that worked fine on its own, but failed at run time when I extracted it into a method and passed in a lambda.
Whilst trying to work out why this was happening, I came to an understanding of the difference between a Func and an Expression, and why it (sometimes) matters.