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