XmlDataSourceView.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / XmlDataSourceView.cs / 1 / XmlDataSourceView.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

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.Security.Permissions;
    using System.Text; 
    using System.Web; 
    using System.Web.UI;
    using System.Xml; 


    /// 
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public sealed class XmlDataSourceView : DataSourceView { 
 
        private XmlDataSource _owner;
 

        /// 
        /// Creates a new instance of XmlDataSourceView.
        ///  
        public XmlDataSourceView(XmlDataSource owner, string name) : base(owner, name) {
            _owner = owner; 
        } 

 
        /// 
        /// Returns all the rows of the datasource.
        /// 
        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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