Get a list of elements by their ID in entity framework

Question

How can I get all elements that are in another list by ID? For eg; I have List roles; I\'d like to get all roles from the database that are in this this list by their Id.

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Answer 1

You can't combine a local list with remote data, then there is nothing for the db to read from since the data is elsewere (on your client).

I think there might be better solution to what you're trying to do;

It seems like you're trying to fetch all roles assigned to a specific user. If that's the case i would suggest a solution where you're passing the current user id to the database and fetch the roles assigned with a INNER JOIN.

Depending on your database it might look something like this (if you're connecting users with roles through a table called 'UserRoles')

var roles = db.UserRoles.Where(x => x.UserID == ).Select(x => x.Role)

(Of course you could also create a stored procedure returning a list of 'Role' if you like directly in your db and map it.)