Question

Can I use partial classes to create properties that points to an association property generated by the L2S designer. Also, will I be able to use the new property in queries?

How can I achieve this?

Answer 1

Yes you can, but you have to apply the same attributes as the linq2sql generated property i.e.

    [Association(Name="Test_TestData", Storage="_TestDatas", ThisKey="SomeId", OtherKey="OtherId")]
    public System.Data.Linq.EntitySet<TestData> MyTestDatas
    {
        get
        {
            return this.TestDatas;
        }
    }

TestDatas being the original relation.

Update: A sample query I ran:

        var context = new DataClasses1DataContext();
        var tests =
            from d in context.Tests
            where d.MyTestDatas.Any(md=>md.MyId == 2)
            select new
            {
                SomeId = d.SomeId,
                SomeData = d.SomeData,
                Tests = d.MyTestDatas
            };
        foreach (var test in tests)
        {
            var data = test.Tests.ToList();
        }