Projection doesnt work with concrete types

[zulkamal]

Profiling mongo when running projected queries show that the reslen and bytes returned are the same as non projected queries.

Applies to both standard and linq queries.

[zulkamal]

I believe I've found the problem area but unfortunately I don't know how to fix it (not familiar with linq. yet!)

In MongoCollectionGeneric.cs - line 385
public IEnumerable Find<U, O, Z>(U template, O orderBy, int limit, int skip, String fullName, Expression<Func<T, Z>> fieldSelection)

For anonymous lambdas, the fieldSelection cast goes well but for concrete-typed lambdas, none of casts go through cause the expression in now a MemberInitExpression, so fieldSelectionExpando never gets populated.

#region Extract field names to request
        var exp = fieldSelection.Body as NewExpression;
        var fieldSelectionExpando = new Expando();
        if (exp != null)
        {
            foreach (var x in exp.Arguments.OfType<MemberExpression>())
            {
                fieldSelectionExpando[x.GetPropertyAlias()] = 1;
            }
        }
        else if (fieldSelection.Body is MemberExpression)
        {
            var me = fieldSelection.Body as MemberExpression;
            fieldSelectionExpando[me.GetPropertyAlias()] = 1;
        }
#endregion

Hope this helps.