/// <summary>
/// Emit lambda function that returns values used for sorting and
/// call to OrderedSequence.OrderBy method (with current LINQ context as
/// first and generated lambda as a second parameter)
/// </summary>
public override PhpTypeCode Emit(LinqBuilder codeGenerator)
{
ILEmitter il = codeGenerator.IL;
// NEW Func[object,object](<linq context>, <&lambda>);
codeGenerator.EmitLoadLinqContext();
il.Emit(OpCodes.Ldftn, codeGenerator.EmitLambda(string.Format("<Comparer_{0}>",
codeGenerator.GetNextComparerNum()), valueVar, expression, PhpTypeCode.Object));
il.Emit(OpCodes.Newobj, LinqExterns.Func2_object_object_ctor);
// LOAD Select[object,object](<source>, <delegate>);
if (isThenBy)
{
il.Emit(OpCodes.Call, ordering == Ordering.Descending ? LinqExterns.ThenByDescending : LinqExterns.ThenBy);
}
else
{
il.Emit(OpCodes.Call, ordering == Ordering.Descending ? LinqExterns.OrderByDescending : LinqExterns.OrderBy);
}
return(base.Emit(codeGenerator));
}