protected override void VisitSortKey(ODataSortKeyExpression node)
{
this.Write(node.Expression)
.Write(" DESC", @if: node.Descending);
}
private static IQueryable<TElement> ApplyOrderBy<TElement>(IQueryable<TElement> query, ODataSortKeyExpression sortKey, bool isPrimarySort)
{
var parameter = Expression.Parameter(typeof(TElement));
var translated = Translate(parameter, sortKey.Expression);
var lambda = Expression.Lambda(translated, parameter);
var methodName = (isPrimarySort ? "OrderBy" : "ThenBy") + (sortKey.Descending ? "Descending" : string.Empty);
MethodInfo method;
switch (methodName)
{
case "OrderBy":
method = Helpers.GetMethod((IQueryable<object> q) => q.OrderBy(o => o));
break;
case "OrderByDescending":
method = Helpers.GetMethod((IQueryable<object> q) => q.OrderByDescending(o => o));
break;
case "ThenBy":
method = Helpers.GetMethod((IOrderedQueryable<object> q) => q.ThenBy(o => o));
break;
case "ThenByDescending":
method = Helpers.GetMethod((IOrderedQueryable<object> q) => q.ThenByDescending(o => o));
break;
default:
throw Throw.UnexpectedCase(methodName);
}
var denormalizedLambda = ODataEntity.Denormalize(lambda);
var result = method.GetGenericMethodDefinition()
.MakeGenericMethod(lambda.Type.GetGenericArguments(typeof(Func<,>)))
.Invoke(null, new object[] { query, denormalizedLambda });
return (IQueryable<TElement>)result;
}
