private static IOrderedQueryable <T> DynamicOrderBy <T, TKey>(IQueryable <T> query, OrderByItem orderBy)
{
var keySelector = (Expression <Func <T, TKey> >)orderBy.Expression;
var orderedQuery = query as IOrderedQueryable <T>;
if (orderedQuery != null && query.Expression.Type != typeof(IQueryable <T>))
{
return(orderBy.Descending
? orderedQuery.ThenByDescending(keySelector)
: orderedQuery.ThenBy(keySelector));
}
return(orderBy.Descending
? query.OrderByDescending(keySelector)
: query.OrderBy(keySelector));
}
private static IOrderedQueryable <T> DynamicOrderBy <T>(IQueryable <T> query, OrderByItem orderBy)
{
var func = MethodHelpers.GetMethodInfo(DynamicOrderBy <T, object>, query, orderBy)
.GetGenericMethodDefinition()
.MakeGenericMethod(typeof(T), orderBy.Expression.PropertyInfo().PropertyType);
return((IOrderedQueryable <T>)func.Invoke(null, new object[] { query, orderBy }));
}