Question

Ok, I am not having much luck with this. I am new to Entity Framework, and have been fighting with this one little thing since yesterday.

Here are my tables:

1. Clients (id, clientname)
2. Projects (id, projectname, clientid)
3. Tasks (id, taskname, projectid, statusid)
4. TaskStatuses (id, statusname)

In code I am only working with one project at a time, and here is how I load that project with EF:

thisProject = (from p in dataEntity.projects
                   where p.id == projectID
                   select p).FirstOrDefault();

Then later when I load the tasks:

thisProject.Tasks.Load();

Then I set the datasource of a DevExpress XtraGrid to the loaded Tasks:

taskGridControl.DataSource = thisProject.Tasks;

Up until this point everything works as expected, and the grid shows all of the tasks for the project I have loaded. But, I also want to show the Task statusname field, and that is stored in a different table.

This was very easy with a sql join, but for the life of me I cannot figure this out.

Answer 1

It’s easiest to select your data out into a class that’s custom-made for this grid view:

from t in dataEntity.tasks
where t.projectId == projectID
select new TaskInfo
{
    ProjectName = t.project.projectname,
    TaskName = t.taskname,
    StatusName = t.taststatus.statusname
}