Question

Hello I am a Entity Framework newb and I am trying to get the following code into a single query for a data relationship. The relationship is one to many.

The code that does not work:

var categories = db.DataModel.Categories
    .Where(c => c.CategoryTypeID == getCategoryTypeID(selectedId));

int getCategoryTypeID(int selectedTypeId)
{
    return db.DataModel.CategoryLinkTypes.Where(l => l.ID == selectedTypeId)
        .FirstOrDefault().ToInt(0);
}

I hope you can see what I am trying to do. When I run this code I get this error:

LINQ to Entities does not recognize the method ‘Int32 getCategoryTypeID(Int32)’
method, and this method cannot be translated into a store expression.

Can someone show me the proper way to do this?

I am using EF 4 + and C#

Answer 1

You can try pulling your function out of the link query:

int categoryTypeId = getCategoryTypeID(selectedId);

var categories = db.DataModel.Categories
    .Where(c => c.CategoryTypeID == categoryTypeId);