Question

I am getting the following exception:
LINQ to Entities does not recognize the method ‘Int64 ToInt64(System.String)’ method, and this method cannot be translated into a store expression.

I had long.Parse(ProjectID.ToString()) and I see the suggestion was to use Convert.ToInt64 but I am still getting the same exception

string projID = ProjectFileID.ToString();

            var d = (from f in context.FileInfo
                     where f.ID == Convert.ToInt64(projID)
                     select (f));

Answer 1

Just do the conversion outside the query, so you compare the results directly to a variable of type long:

// TODO: Error handling
long projID = Convert.ToInt64(ProjectFileID.ToString());

var d = (from f in context.FileInfo
         where f.ID == projID
         select (f));

Also, given that you’re calling ToString() on ProjectFileID, can you maybe just cast it instead, since it certainly seems like it’s an int or something along those lines.