Passing func as parameter in Linq to Entities and 'Internal .NET Framework Data Provider error 1025' error

Question

We have a class called Task:

public partial class Task : EntityObject
{
    public EntityCollection TaskUsers { get {...} set{...} } 
}


        

Answer 1

Well the EF can only translate Expressions, not functions.

i.e. it can translate this:

Expression<Func<TaskUser,bool>> 

but not this:

Func<TaskUser,bool>

As for how to merge expressions (in pseudo code):

Expression<Func<TaskUser, bool>> expression = a => a.User.ID == 1;
return tasks.Where(t => t.TaskUsers.Any(expression));

There are probably some Expression guru's who can help with that.

I suggest a followup question focused on that particular problem

Alex