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//
// DataTableExtensions.cs
//
// Author:
// Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2008 Novell, Inc. http://www.novell.com
//
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
namespace System.Data
{
public static class DataTableExtensions
{
public static DataView AsDataView (this DataTable table)
{
return AsDataView<DataRow> (table.AsEnumerable ());
}
[MonoTODO ("We should implement an effective DataView derivation; looks like .NET does.")]
public static DataView AsDataView<T> (this EnumerableRowCollection<T> source)
where T : DataRow
{
return CopyToDataTable<T> (source).DefaultView;
}
public static EnumerableRowCollection<DataRow> AsEnumerable (this DataTable source)
{
return new EnumerableRowCollection<DataRow> (new DataRowEnumerable<DataRow> (source));
}
public static DataTable CopyToDataTable<T> (this IEnumerable<T> source)
where T : DataRow
{
DataTable dt = new DataTable ();
IEnumerator<T> e = source.GetEnumerator ();
if (!e.MoveNext ())
throw new InvalidOperationException ("The source contains no DataRows");
foreach (DataColumn col in e.Current.Table.Columns)
dt.Columns.Add (new DataColumn (col.ColumnName, col.DataType, col.Expression, col.ColumnMapping));
CopyToDataTable<T> (source, dt, LoadOption.PreserveChanges);
return dt;
}
public static void CopyToDataTable<T> (this IEnumerable<T> source, DataTable table, LoadOption options)
where T : DataRow
{
CopyToDataTable<T> (source, table, options, null);
}
public static void CopyToDataTable<T> (this IEnumerable<T> source, DataTable table, LoadOption options, FillErrorEventHandler errorHandler)
where T : DataRow
{
var reader = new RowEnumerableDataReader (source, 0);
table.Load (reader, options, errorHandler);
}
}
class DataRowEnumerable<TRow> : IEnumerable<TRow>
{
DataTable source;
public DataRowEnumerable (DataTable source)
{
this.source = source;
}
public IEnumerator<TRow> GetEnumerator ()
{
foreach (TRow row in source.Rows)
yield return row;
}
IEnumerator IEnumerable.GetEnumerator ()
{
return GetEnumerator ();
}
}
}
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