internal void AddColumn <TKey>(TControl value, Expression <Func <TEntity, TKey> > column)
{
var sortExpression = new TableSortOperation
{
CreateSort = (isPrimary, direction) =>
{
if (isPrimary)
{
return(direction == SortDirection.Ascending
? (Func <IQueryable <TEntity>, IOrderedQueryable <TEntity> >)
(queryable => queryable.OrderBy(column))
: queryable => queryable.OrderByDescending(column));
}
else
{
return(direction == SortDirection.Ascending
? (Func <IQueryable <TEntity>, IOrderedQueryable <TEntity> >)
(queryable => ((IOrderedQueryable <TEntity>)queryable).ThenBy(column))
: (queryable => ((IOrderedQueryable <TEntity>)queryable).ThenByDescending(column)));
}
}
};
_columns[value] = sortExpression;
}
public IOrderedQueryable <TEntity> Sort(TRequest request, IQueryable <TEntity> queryable)
{
TableSortOperation sortOperation = null;
var value = _controls[0].Control(request);
var direction = _controls[0].Direction(request);
if (value == null || !_columns.TryGetValue(value, out sortOperation))
{
if (_defaultColumn != null)
{
_columns.TryGetValue(_defaultColumn, out sortOperation);
}
}
if (sortOperation == null)
{
return(_columns.Values.First().CreateSort(true, SortDirection.Default)(queryable));
}
var sort = sortOperation.CreateSort(true, direction);
var result = sort(queryable);
foreach (var ctrl in _controls.Skip(1))
{
value = ctrl.Control(request);
direction = ctrl.Direction(request);
if (value == null || !_columns.TryGetValue(value, out sortOperation))
{
continue;
}
sort = sortOperation.CreateSort(false, direction);
result = sort(result);
}
return(result);
}
