Does “foreach” cause repeated Linq execution?

Question

I\'ve been working for the first time with the Entity Framework in .NET, and have been writing LINQ queries in order to get information from my model. I would like to progr

Answer 1

Sometimes it might be a good idea to "cache" a LINQ query using ToList() or ToArray(), if the query is being accessed multiple times in your code.

But keep in mind that "caching" it still calls a foreach in turn.

So the basic rule for me is:

• if a query is simply used in one foreach (and thats it) - then I don't cache the query
• if a query is used in a foreach and in some other places in the code - then I cache it in a var using ToList/ToArray