62 lines
2.5 KiB
C#
62 lines
2.5 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="ReadOnlyHierarchicalDataSource.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 hierarchical data bound controls to wrap an generic
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/// data source with a strongly typed IHierarchicalDataSource. This class
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/// automatically handles other IHierarchicalDataSources and
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/// IHierarchicalEnumerables. This class uses
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/// ReadOnlyHierarchicalDataSourceView to represent individual views.
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/// </devdoc>
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internal sealed class ReadOnlyHierarchicalDataSource : IHierarchicalDataSource {
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private object _dataSource;
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public ReadOnlyHierarchicalDataSource(object dataSource) {
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Debug.Assert(dataSource == null || (dataSource is IHierarchicalEnumerable || dataSource is IHierarchicalDataSource), "Expected dataSource to be either null, an IHierarchicalEnumerable, or an IHierarchicalDataSource.");
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_dataSource = dataSource;
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}
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#region Implementation of IHierarchicalDataSource
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event EventHandler IHierarchicalDataSource.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 IHierarchicalDataSource and IHierarchicalEnumerable, and
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/// return an approprite HierarchicalDataSourceView.
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/// </devdoc>
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HierarchicalDataSourceView IHierarchicalDataSource.GetHierarchicalView(string viewPath) {
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// Check first for IHierarchicalDataSource
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IHierarchicalDataSource ds = _dataSource as IHierarchicalDataSource;
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if (ds != null) {
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return ds.GetHierarchicalView(viewPath);
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}
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IHierarchicalEnumerable enumerable = _dataSource as IHierarchicalEnumerable;
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if (enumerable != null && viewPath != null && viewPath.Length != 0) {
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throw new InvalidOperationException(SR.GetString(SR.ReadOnlyHierarchicalDataSourceView_CantAccessPathInEnumerable));
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}
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return new ReadOnlyHierarchicalDataSourceView(enumerable);
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}
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#endregion
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}
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}
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