115 lines
3.6 KiB
C#
115 lines
3.6 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="XmlDataSourceView.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.Data;
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using System.Diagnostics;
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using System.Drawing.Design;
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using System.Text;
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using System.Web;
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using System.Web.UI;
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using System.Xml;
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/// <devdoc>
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/// </devdoc>
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public sealed class XmlDataSourceView : DataSourceView {
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private XmlDataSource _owner;
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/// <devdoc>
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/// Creates a new instance of XmlDataSourceView.
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/// </devdoc>
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public XmlDataSourceView(XmlDataSource owner, string name) : base(owner, name) {
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_owner = owner;
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}
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/// <devdoc>
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/// Returns all the rows of the datasource.
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/// </devdoc>
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protected internal override IEnumerable ExecuteSelect(DataSourceSelectArguments arguments) {
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arguments.RaiseUnsupportedCapabilitiesError(this);
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XmlNode root = _owner.GetXmlDocument();
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XmlNodeList nodes = null;
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if (_owner.XPath.Length != 0) {
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// If an XPath is specified on the control, use it
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nodes = root.SelectNodes(_owner.XPath);
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}
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else {
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// Otherwise, get all the children of the root
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nodes = root.SelectNodes("/node()/node()");
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}
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return new XmlDataSourceNodeDescriptorEnumeration(nodes);
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}
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public IEnumerable Select(DataSourceSelectArguments arguments) {
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return ExecuteSelect(arguments);
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}
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private class XmlDataSourceNodeDescriptorEnumeration : ICollection {
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private XmlNodeList _nodes;
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private int _count = -1; // -1 indicates we have not yet calculated the count
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public XmlDataSourceNodeDescriptorEnumeration(XmlNodeList nodes) {
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Debug.Assert(nodes != null, "Did not expect null node list");
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_nodes = nodes;
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}
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IEnumerator IEnumerable.GetEnumerator() {
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foreach (XmlNode node in _nodes) {
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if (node.NodeType == XmlNodeType.Element) {
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yield return new XmlDataSourceNodeDescriptor(node);
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}
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}
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}
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int ICollection.Count {
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get {
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if (_count == -1) {
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// If the count has not yet been set, calculate the element count
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_count = 0;
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foreach (XmlNode node in _nodes) {
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if (node.NodeType == XmlNodeType.Element) {
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_count++;
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}
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}
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}
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return _count;
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}
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}
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bool ICollection.IsSynchronized {
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get {
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return false;
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}
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}
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object ICollection.SyncRoot {
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get {
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return null;
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}
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}
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void ICollection.CopyTo(Array array, int index) {
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for (IEnumerator e = ((IEnumerable)this).GetEnumerator(); e.MoveNext(); ) {
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array.SetValue(e.Current, index++);
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}
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}
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}
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}
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}
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