/// <summary>
/// 对 DX GridView 的扩展：为传入的 Q 加载 OrderBy ThenBy OrderDescendingBy ...
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="gv"></param>
/// <param name="q"></param>
/// <returns></returns>
public static IQueryable <T> ApplySorts <T>(this ASPxGridView gv, IQueryable <T> q,
bool processGroup = false, bool groupAsc = true)
{
var columns = gv.GetSortedColumns();
var gColumns = gv.GetGroupedColumns();
List <KeyValuePair <string, bool> > sorts = new List <KeyValuePair <string, bool> >();
foreach (var c in columns.OrderBy(cc => cc.SortIndex))
{
var asc = true;
if (c.SortOrder == DevExpress.Data.ColumnSortOrder.Descending)
{
asc = false;
}
var gC = gColumns.SingleOrDefault(cc => cc.FieldName == c.FieldName);
if (processGroup)
{
if (gC != null)
{
asc = groupAsc;
}
}
else
{
if (gC != null)
{
continue;
}
}
sorts.Add(new KeyValuePair <string, bool>(c.FieldName, asc));
}
return(Exp.AppendSorts <T>(q, sorts.ToArray()));
}
