public IQueryable <T> ApplySort <T>(IQueryable <T> query, string defaultSort = null)
{
var sortDescEnumerator = GetSorts().GetEnumerator();
if (sortDescEnumerator.MoveNext())
{
try
{
// extensions from https://gist.github.com/zaverden/c2d611f33f60cbe8234b420d87671c10
IOrderedQueryable <T> orderedQuery = query.OrderBy(sortDescEnumerator.Current.PropertyName, sortDescEnumerator.Current.Desc);
while (sortDescEnumerator.MoveNext())
{
orderedQuery = orderedQuery.ThenBy(sortDescEnumerator.Current.PropertyName, sortDescEnumerator.Current.Desc);
}
return(orderedQuery);
}
catch (MissingMemberException exc)
{
throw new WrongSortPropertyException(sortDescEnumerator.Current.PropertyName, exc);
}
}
if (defaultSort != null)
{
var ds = SortDesc.Parse(defaultSort);
IOrderedQueryable <T> orderedQuery = query.OrderBy(ds.PropertyName, ds.Desc);
return(orderedQuery);
}
return(query);
}
public IEnumerable <SortDesc> GetSorts()
{
if (string.IsNullOrWhiteSpace(Sort))
{
yield break;
}
foreach (string str in Sort.Split(new[] { ',', ' ', ';' }, StringSplitOptions.RemoveEmptyEntries))
{
var sd = SortDesc.Parse(str);
yield return(sd);
}
}
public static SortDesc Parse(string str)
{
var sd = new SortDesc {
PropertyName = str
};
if (str[0] != '+' && str[0] != '-')
{
return(sd);
}
sd.Desc = str[0] == '-';
sd.PropertyName = str.Substring(1);
return(sd);
}