public static SortingInfo Parse(string sortingHeader)
{
if (sortingHeader == null)
{
return(null);
}
var sorting = new SortingInfo();
var keys = sortingHeader.Split(';');
foreach (var key in keys)
{
if (!key.EndsWith("_asc") && !key.EndsWith("_dsc"))
{
throw new InvalidOperationException("Sorting Header mal formed for sorting");
}
var values = key.Split('_');
var direction = values[1].ToLower().Equals("asc") ? Sorting.Asc : Sorting.Dsc;
var orderBy = values[0];
sorting.Add(orderBy, direction);
}
return(sorting);
}
public override void OnActionExecuting(ActionExecutingContext context)
{
if (context.ActionArguments.Values.OfType <SortingInfo>().Any())
{
var sortingInfo = context.ActionArguments.Values.OfType <SortingInfo>().First();
if (context.HttpContext.Request.Query.ContainsKey("sort"))
{
var items = SortingInfo.Parse(context.HttpContext.Request.Query["sort"]);
foreach (var item in items.Iterator())
{
sortingInfo.Add(item);
}
}
}
}
public static IOrderedQueryable <T> IncludeOrderBy <T>(this IQueryable <T> query, SortingInfo sortingInfo)
{
IOrderedQueryable <T> orderedQueryable = null;
foreach (var sortingElement in sortingInfo.Iterator())
{
var orderBy = sortingElement.GetOrderBy();
var param = orderBy;
var propertyInfo = typeof(T).GetProperty(param);
if (orderedQueryable == null)
{
orderedQueryable = sortingElement.IsAsc()
? query.OrderBy(x => propertyInfo.GetValue(x, null))
: query.OrderByDescending(x => propertyInfo.GetValue(x, null));
}
else
{
orderedQueryable = sortingElement.IsAsc()
? orderedQueryable.ThenBy(x => propertyInfo.GetValue(x, null))
: orderedQueryable.ThenByDescending(x => propertyInfo.GetValue(x, null));
}
}
return(orderedQueryable);
}