XmlDataSourceView.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / XmlDataSourceView.cs / 1305376 / 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.Text;
    using System.Web; 
    using System.Web.UI; 
    using System.Xml;
 

    /// 
    /// 
    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++); 
                }
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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