/// <summary>
/// LINQ's ThenBy operator for generic EnumerableRowCollection.
/// </summary>
public static OrderedEnumerableRowCollection <TRow> ThenBy <TRow, TKey>(this OrderedEnumerableRowCollection <TRow> source, Func <TRow, TKey> keySelector, IComparer <TKey> comparer)
{
IEnumerable <TRow> ie = Enumerable.ThenBy((IOrderedEnumerable <TRow>)source.EnumerableRows, keySelector, comparer);
OrderedEnumerableRowCollection <TRow> edt = new OrderedEnumerableRowCollection <TRow>(source, ie);
edt.AddSortExpression(keySelector, comparer, isDescending: false, isOrderBy: false);
return(edt);
}
/// <summary>
/// LINQ's OrderByDescending operator for generic EnumerableRowCollection.
/// </summary>
public static OrderedEnumerableRowCollection <TRow> OrderByDescending <TRow, TKey>(this EnumerableRowCollection <TRow> source, Func <TRow, TKey> keySelector, IComparer <TKey> comparer)
{
IEnumerable <TRow> ie = Enumerable.OrderByDescending(source, keySelector, comparer);
OrderedEnumerableRowCollection <TRow> edt = new OrderedEnumerableRowCollection <TRow>(source, ie);
edt.AddSortExpression(keySelector, comparer, isDescending: true, isOrderBy: true);
return(edt);
}
/// <summary>
/// LINQ's OrderBy operator for generic EnumerableRowCollection.
/// </summary>
public static OrderedEnumerableRowCollection <TRow> OrderBy <TRow, TKey>(
this EnumerableRowCollection <TRow> source,
Func <TRow, TKey> keySelector)
{
IEnumerable <TRow> ie = Enumerable.OrderBy <TRow, TKey>(source, keySelector);
OrderedEnumerableRowCollection <TRow> edt = new OrderedEnumerableRowCollection <TRow>(source, ie);
edt.AddSortExpression(keySelector, false, true);
return(edt);
}
/// <summary>
/// LINQ's ThenByDescending operator for generic EnumerableRowCollection.
/// </summary>
public static OrderedEnumerableRowCollection <TRow> ThenByDescending <TRow, TKey>(
this OrderedEnumerableRowCollection <TRow> source,
Func <TRow, TKey> keySelector)
{
IEnumerable <TRow> ie =
Enumerable.ThenByDescending <TRow, TKey>((IOrderedEnumerable <TRow>)source.EnumerableRows, keySelector);
OrderedEnumerableRowCollection <TRow> edt =
new OrderedEnumerableRowCollection <TRow>((EnumerableRowCollection <TRow>)source, ie);
edt.AddSortExpression(keySelector, /*desc*/ true, false);
return(edt);
}
public void ThenBy_AddSortExpressionValidation()
{
var(table, one, two, three) = InstantiateTable();
// Order the EnumerableRowCollection
OrderedEnumerableRowCollection <DataRow> orderedSource = table.Cast <DataRow>().OrderBy(row => int.Parse((string)row.ItemArray[0]));
DataRow zero = table.Rows.Add(0);
var orderedAgain = orderedSource.ThenBy(row => int.Parse((string)row.ItemArray[0]));
Assert.Equal(new DataRow[] { zero, one, two, three }, orderedAgain);
DataRow negative = table.Rows.Add(-1);
var comparedAgain = orderedSource.ThenBy((row => row), new TestDataRowComparer <DataRow>());
Assert.Equal(new DataRow[] { negative, zero, one, two, three }, comparedAgain);
}
internal static OrderedEnumerableRowCollection <TRow> AddSort <TRow, TKey> (OrderedEnumerableRowCollection <TRow> source, Func <TRow, TKey> keySelector, IComparer <TKey> comparer, bool descending)
{
source.source.Sorter.AddSort <TKey> (keySelector, comparer, descending);
return(source);
}
public static OrderedEnumerableRowCollection <TRow> OrderByDescending <TRow, TKey> (this TypedTableBase <TRow> source, Func <TRow, TKey> keySelector, IComparer <TKey> comparer)
where TRow : DataRow
{
return(OrderedEnumerableRowCollection <TRow> .Create <TRow, TKey> (source, keySelector, comparer, true));
}
public static OrderedEnumerableRowCollection <TRow> ThenByDescending <TRow, TKey> (this OrderedEnumerableRowCollection <TRow> source, Func <TRow, TKey> keySelector, IComparer <TKey> comparer)
{
return(OrderedEnumerableRowCollection <TRow> .AddSort <TRow, TKey> (source, keySelector, comparer, true));
}
public static OrderedEnumerableRowCollection <TRow> ThenByDescending <TRow, TKey> (this OrderedEnumerableRowCollection <TRow> source, Func <TRow, TKey> keySelector)
{
return(ThenByDescending <TRow, TKey> (source, keySelector, Comparer <TKey> .Default));
}
public static OrderedEnumerableRowCollection <TRow> OrderBy <TRow, TKey> (this EnumerableRowCollection <TRow> source, Func <TRow, TKey> keySelector, IComparer <TKey> comparer)
{
return(OrderedEnumerableRowCollection <TRow> .Create <TRow, TKey> (source, keySelector, comparer, false));
}
