The LINQ expression node type 'ArrayIndex' is not supported in LINQ to Entities

Question

public List GetpathsById(List id)
{
    long[] aa = id.ToArray();
        long x;
    List paths = new List();
         


        

Answer 1

Apparently, if you use an array index (aa[i]) inside an expression tree, it tries to convert that into an expression as well.

Just work around it by using a separate variable:

int presId = aa[i];
Presentation press = context.Presentations.Where(m => m.PresId == presId).FirstOrDefault();