66 lines
2.3 KiB
C#
66 lines
2.3 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ReadOnlyDataSource.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.UI.WebControls {
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Web;
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using System.Web.UI;
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using System.Web.Util;
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/// <devdoc>
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/// Helper class for data bound controls to wrap an generic data source
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/// with a strongly typed IDataSource. This class automatically handles
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/// other IDataSources, IEnumerable, and IListSource objects.
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/// This class uses ReadOnlyDataSourceView to represent individual views.
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/// </devdoc>
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internal sealed class ReadOnlyDataSource : IDataSource {
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private static string[] ViewNames = new string[0];
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private string _dataMember;
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private object _dataSource;
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public ReadOnlyDataSource(object dataSource, string dataMember) {
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Debug.Assert(dataSource == null || (dataSource is IEnumerable || dataSource is IDataSource || dataSource is IListSource), "Expected dataSource to be either null, an IEnumerable, an IDataSource, or an IListSource.");
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_dataSource = dataSource;
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_dataMember = dataMember;
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}
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#region Implementation of IDataSource
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event EventHandler IDataSource.DataSourceChanged {
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add {
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}
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remove {
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}
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}
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/// <devdoc>
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/// Check for IDataSource, IListSource, and IEnumerable, and return an
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/// approprite DataSourceView.
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/// </devdoc>
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DataSourceView IDataSource.GetView(string viewName) {
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// Check first for IDataSource
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IDataSource ds = _dataSource as IDataSource;
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if (ds != null) {
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return ds.GetView(viewName);
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}
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IEnumerable enumerable = DataSourceHelper.GetResolvedDataSource(_dataSource, _dataMember);
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return new ReadOnlyDataSourceView(this, _dataMember, enumerable);
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}
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ICollection IDataSource.GetViewNames() {
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return ViewNames;
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}
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#endregion
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}
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}
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