public static IOrderedDataServiceQueryable <T, T> Sort <T, T2>(this IDataServiceQueryable <T, T> query, Expression <Func <T, T2> > member, C1.Silverlight.DataGrid.DataGridSortDirection direction, ref bool isFirst) where T : Entity, new()
{
if (direction == C1.Silverlight.DataGrid.DataGridSortDirection.None)
{
direction = C1.Silverlight.DataGrid.DataGridSortDirection.Ascending;
}
if (isFirst)
{
isFirst = false;
if (direction == C1.Silverlight.DataGrid.DataGridSortDirection.Ascending)
{
return(query.OrderBy(member));
}
else
{
return(query.OrderByDescending(member));
}
}
else
{
if (direction == C1.Silverlight.DataGrid.DataGridSortDirection.Ascending)
{
return(((IOrderedDataServiceQueryable <T, T>)query).ThenBy(member));
}
else
{
return(((IOrderedDataServiceQueryable <T, T>)query).ThenByDescending(member));
}
}
}
