On Wed, 2010-05-19 at 20:54 -0700, xanadont wrote:
> Is it possible to project types generated by DbLinq to other types?
> For example:
>
> var mine = from i in Context.Items
> select new MyItem
> {
> Id = i.ID,
> Value = i.Value
> };
>
> I'm getting exceptions where the Message is simply "New". Is there a
> work around for this?
Can you provide a full stack trace? This should work, with the exception
that you can't use 'new' to create new Entity instances; see
ExpressionDispatercher.Analyzer.cs:AnalyzeSelect():
protected virtual Expression AnalyzeSelect(IList<Expression>
parameters, BuilderContext builderContext)
{
// just call back the underlying lambda (or quote, whatever)
Expression ex = Analyze(parameters[1], parameters[0],
builderContext);
//
http://social.msdn.microsoft.com/Forums/en-US/linqprojectgeneral/thread/1ce25da3-44c6-407d-8395-4c146930004b
if (ex.NodeType == ExpressionType.MemberInit &&
builderContext.QueryContext.DataContext.Mapping.GetMetaType(ex.Type) != null)
throw new NotSupportedException(
string.Format("Explicit construction of entity type '{0}'
in query is not allowed.",
ex.Type.FullName));
TableExpression tableExpression = parameters[0] as TableExpression;
if (tableExpression != null &&
builderContext.CurrentSelect.Tables.Count == 0)
RegisterTable(tableExpression, builderContext);
return ex;
}
- Jon
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