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

public List GetpathsById(List id) 
{ 
        long x; 
    List paths = new List(); 
    foreach(long aa in id) 
    { 
        Presentation press = context.Presentations.Where(m => m.PresId == aa).FirstOrDefault(); 
        paths.Add(press.FilePath); 
    } 
    return paths; 
} 

to

public IEnumerable GetpathsById(List id) 
{ 
    foreach(long item in id) 
        yield return = (context.Presentations.Where(m => m.PresId == item).FirstOrDefault()).FilePath
} 

"Short style", but not recomended if you write a lot of other function.