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