public static decimal?Sum <TSource>(this IQueryable <TSource> source, Expression <Func <TSource, decimal?> > selector)
{
Check.SourceAndSelector(source, selector);
return(source.Provider.Execute <decimal?>(StaticCall(MakeGeneric(MethodBase.GetCurrentMethod(), typeof(TSource)), source.Expression, Expression.Quote(selector))));
}
public static IQueryable <TResult> SelectMany <TSource, TResult>(this IQueryable <TSource> source, Expression <Func <TSource, int, IEnumerable <TResult> > > selector)
{
Check.SourceAndSelector(source, selector);
return(source.Provider.CreateQuery <TResult>(StaticCall(MakeGeneric(MethodBase.GetCurrentMethod(), typeof(TSource), typeof(TResult)), source.Expression, Expression.Quote(selector))));
}