SiteMapDataSource.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / SiteMapDataSource.cs / 1305376 / SiteMapDataSource.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Drawing;
    using System.Drawing.Design;
    using System.Web; 
    using System.Web.UI;
    using System.Web.Util; 
 
    [
    Designer("System.Web.UI.Design.WebControls.SiteMapDataSourceDesigner, " + AssemblyRef.SystemDesign), 
    ParseChildren(true),
    PersistChildren(false),
    ToolboxBitmap(typeof(SiteMapDataSource)),
    WebSysDescription(SR.SiteMapDataSource_Description), 
    WebSysDisplayName(SR.SiteMapDataSource_DisplayName)
    ] 
 
    public class SiteMapDataSource : HierarchicalDataSourceControl, IDataSource, IListSource {
        private const string DefaultViewName = "DefaultView"; 
        private ICollection _viewNames;
        private SiteMapDataSourceView _dataSourceView;
        private SiteMapProvider _provider;
 

        [ 
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        WebSysDescription(SR.SiteMapDataSource_ContainsListCollection) 
        ]
        public virtual bool ContainsListCollection {
            get {
                return ListSourceHelper.ContainsListCollection(this); 
            }
        } 
 

        ///  
        ///    
        /// 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden),
        WebSysDescription(SR.SiteMapDataSource_Provider) 
        ] 
        public SiteMapProvider Provider {
            get { 
                if (_provider != null)
                    return _provider;

                // If not specified, use the default provider. 
                if (String.IsNullOrEmpty(SiteMapProvider)) {
                    _provider = SiteMap.Provider; 
 
                    if (_provider == null) {
                        throw new HttpException(SR.GetString(SR.SiteMapDataSource_DefaultProviderNotFound)); 
                    }
                }
                else {
                    _provider = SiteMap.Providers[SiteMapProvider]; 

                    if (_provider == null) { 
                        throw new HttpException(SR.GetString(SR.SiteMapDataSource_ProviderNotFound, SiteMapProvider)); 
                    }
                } 

                return _provider;
            }
            set { 
                if (_provider != value) {
                    _provider = value; 
                    OnDataSourceChanged(EventArgs.Empty); 
                }
            } 
        }


        ///  
        ///    Indicates whether the starting node should be displayed.
        ///  
        [ 
        DefaultValue(true),
        WebCategory("Behavior"), 
        WebSysDescription(SR.SiteMapDataSource_ShowStartingNode)
        ]
        public virtual bool ShowStartingNode {
            get { 
                object o = ViewState["ShowStartingNode"];
                return (o == null) ? true : (bool)o; 
            } 
            set {
                if (value != ShowStartingNode) { 
                    ViewState["ShowStartingNode"] = value;
                    OnDataSourceChanged(EventArgs.Empty);
                }
            } 
        }
 
 
        /// 
        ///    Indicates the name of the SiteMapProvider used to populate the datasource control. 
        /// 
        [
        DefaultValue(""),
        WebCategory("Behavior"), 
        WebSysDescription(SR.SiteMapDataSource_SiteMapProvider)
        ] 
        public virtual string SiteMapProvider { 
            get {
                string provider = ViewState["SiteMapProvider"] as string; 
                return (provider == null) ? String.Empty : provider;
            }
            set {
                if (value != SiteMapProvider) { 
                    _provider = null;
                    ViewState["SiteMapProvider"] = value; 
                    OnDataSourceChanged(EventArgs.Empty); 
                }
            } 
        }


        ///  
        ///    Indicates the starting node offset used to populate the datasource control.
        ///  
        [ 
        DefaultValue(0),
        WebCategory("Behavior"), 
        WebSysDescription(SR.SiteMapDataSource_StartingNodeOffset)
        ]
        public virtual int StartingNodeOffset {
            get{ 
                object o = ViewState["StartingNodeOffset"];
                if (o == null) { 
                    return 0; 
                }
                return (int)o; 
            }
            set {
                if (value != StartingNodeOffset) {
                    ViewState["StartingNodeOffset"] = value; 
                    OnDataSourceChanged(EventArgs.Empty);
                } 
            } 
        }
 
        /// 
        ///    
        /// 
        [ 
        DefaultValue(false),
        WebCategory("Behavior"), 
        WebSysDescription(SR.SiteMapDataSource_StartFromCurrentNode) 
        ]
        public virtual bool StartFromCurrentNode { 
            get {
                object o = ViewState["StartFromCurrentNode "];
                return (o == null) ? false : (bool)o;
            } 
            set {
                if (value != StartFromCurrentNode) { 
                    ViewState["StartFromCurrentNode "] = value; 
                    OnDataSourceChanged(EventArgs.Empty);
                } 
            }
        }

 
        /// 
        ///    Indicates the starting node url used to populate the datasource control. 
        ///  
        [
        DefaultValue(""), 
        Editor("System.Web.UI.Design.UrlEditor, " + AssemblyRef.SystemDesign, typeof(UITypeEditor)),
        UrlProperty(),
        WebCategory("Behavior"),
        WebSysDescription(SR.SiteMapDataSource_StartingNodeUrl) 
        ]
        public virtual string StartingNodeUrl { 
            get { 
                string startingNodeUrl = ViewState["StartingNodeUrl"] as string;
                return (startingNodeUrl == null) ? String.Empty : startingNodeUrl; 
            }
            set {
                if (value != StartingNodeUrl) {
                    ViewState["StartingNodeUrl"] = value; 
                    OnDataSourceChanged(EventArgs.Empty);
                } 
            } 
        }
 
        // Helper method to return the nodes.
        private SiteMapNodeCollection GetNodes() {
            SiteMapNode node = null;
            int startingNodeOffset = StartingNodeOffset; 

            if (!String.IsNullOrEmpty(StartingNodeUrl) && StartFromCurrentNode) { 
                throw new InvalidOperationException(SR.GetString(SR.SiteMapDataSource_StartingNodeUrlAndStartFromcurrentNode_Defined)); 
            }
 
            if (StartFromCurrentNode) {
                node = Provider.CurrentNode;
            }
            else if (!String.IsNullOrEmpty(StartingNodeUrl)) { 
                node = Provider.FindSiteMapNode(MakeUrlAbsolute(StartingNodeUrl));
                if (node == null) { 
                    throw new ArgumentException(SR.GetString(SR.SiteMapPath_CannotFindUrl, StartingNodeUrl)); 
                }
            } 
            else {
                node = Provider.RootNode;
            }
 
            if (node == null) {
                return null; 
            } 

            if (startingNodeOffset <= 0) { 
                if (startingNodeOffset != 0) {
                    // Hind neighborhood nodes based on startingNodeOffset
                    Provider.HintNeighborhoodNodes(node, Math.Abs(startingNodeOffset), 0);
 
                    SiteMapNode parentNode = node.ParentNode;
                    while (startingNodeOffset < 0 && parentNode != null) { 
                        node = node.ParentNode; 
                        parentNode = node.ParentNode;
                        startingNodeOffset++; 
                    }
                }

                return GetNodes(node); 
            }
 
            // else if (startingNodeOffset > 0) 
            SiteMapNode currentNode = Provider.GetCurrentNodeAndHintAncestorNodes(-1);
 
            // If the current node is not in StartingNode's subtree, return null.
            if (currentNode == null || !currentNode.IsDescendantOf(node) || currentNode.Equals(node)) {
                return null;
            } 

            SiteMapNode leadingNode = currentNode; 
 
            // Create a gap of n levels between the following and the leading nodes.
            for (int i = 0; i < startingNodeOffset; i++) { 
                leadingNode = leadingNode.ParentNode;

                // If the current node is within n levels below the starting node,
                // use the current node. 
                if (leadingNode == null || leadingNode.Equals(node)) {
                    return GetNodes(currentNode); 
                } 
            }
 
            SiteMapNode followingNode = currentNode;
            while (leadingNode != null && !leadingNode.Equals(node)) {
                followingNode = followingNode.ParentNode;
                leadingNode = leadingNode.ParentNode; 
            }
 
            return GetNodes(followingNode); 
        }
 
        private SiteMapNodeCollection GetNodes(SiteMapNode node) {
            if (ShowStartingNode) {
                return new SiteMapNodeCollection(node);
            } 

            return node.ChildNodes; 
        } 

 
        protected override HierarchicalDataSourceView GetHierarchicalView(string viewPath) {

            if (Provider == null)
                throw new HttpException(SR.GetString(SR.SiteMapDataSource_ProviderNotFound, SiteMapProvider)); 

            return GetTreeView(viewPath); 
        } 

 
        public virtual IList GetList() {
            return ListSourceHelper.GetList(this);
        }
 
        // Helper method to get the non-hierarhical path view. ie. from BaseNode to currentNode.
        // if currentNode is not in the subtree rooted at basenode, returns empty collection. 
        internal SiteMapNodeCollection GetPathNodeCollection(string viewPath) { 

            SiteMapNodeCollection collection = null; 

            if (String.IsNullOrEmpty(viewPath)) {
                collection = GetNodes();
            } 
            else {
                // Otherwise, return the child nodes specified by the key (viewPath) 
                SiteMapNode node = Provider.FindSiteMapNodeFromKey(viewPath); 
                if (node != null) {
                    collection = node.ChildNodes; 
                }
            }

            if (collection == null) { 
                collection = SiteMapNodeCollection.Empty;
            } 
 
            return collection;
        } 

        private HierarchicalDataSourceView GetTreeView(string viewPath) {

            SiteMapNode node = null; 

            // When querying for the whole view, returns the view starting from the designated node. 
            if (String.IsNullOrEmpty(viewPath)) { 
                SiteMapNodeCollection nodes = GetNodes();
                if (nodes != null) { 
                    return nodes.GetHierarchicalDataSourceView();
                }
            }
            // Otherwise, return the child nodes specified by the key (viewPath) 
            else {
                node = Provider.FindSiteMapNodeFromKey(viewPath); 
                if (node != null) 
                    return node.ChildNodes.GetHierarchicalDataSourceView();
            } 

            // return the view of an empty readonly collection
            return SiteMapNodeCollection.Empty.GetHierarchicalDataSourceView();
        } 

 
        public virtual DataSourceView GetView(string viewName) { 
            if (Provider == null)
                throw new HttpException(SR.GetString(SR.SiteMapDataSource_ProviderNotFound, SiteMapProvider)); 

            if (_dataSourceView == null) {
                _dataSourceView = SiteMapNodeCollection.ReadOnly(GetPathNodeCollection(viewName)).GetDataSourceView(this, String.Empty);
 
            }
 
            return _dataSourceView; 
        }
 

        public virtual ICollection GetViewNames() {
            if (_viewNames == null) {
                _viewNames = new string[1] { DefaultViewName }; 
            }
            return _viewNames; 
        } 

        private string MakeUrlAbsolute(string url) { 
            // check if its empty or already absolute
            if (url.Length == 0 || !UrlPath.IsRelativeUrl(url)) {
                return url;
            } 

            string baseUrl = AppRelativeTemplateSourceDirectory; 
            if (baseUrl.Length == 0) { 
                return url;
            } 

            // Make it absolute
            return UrlPath.Combine(baseUrl, url);
        } 

        #region IDataSource implementations 
        ///  
        ///   Raised when the underlying data source has changed. The
        ///   change may be due to a change in the control's properties, 
        ///   or a change in the data due to an edit action performed by
        ///   the DataSourceControl.
        /// 
        event EventHandler IDataSource.DataSourceChanged { 
            add {
                ((IHierarchicalDataSource)this).DataSourceChanged += value; 
            } 
            remove {
                ((IHierarchicalDataSource)this).DataSourceChanged -= value; 
            }
        }

 
        /// 
        DataSourceView IDataSource.GetView(string viewName) { 
            return GetView(viewName); 
        }
 

        /// 
        ICollection IDataSource.GetViewNames() {
            return GetViewNames(); 
        }
        #endregion 
 
        #region Implementation of IListSource
 
        /// 
        bool IListSource.ContainsListCollection {
            get {
                if (DesignMode) { 
                    return false;
                } 
                return ContainsListCollection; 
            }
        } 


        /// 
        IList IListSource.GetList() { 
            if (DesignMode) {
                return null; 
            } 
            return GetList();
        } 
        #endregion
    }
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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SiteMapDataSource.cs source code in C# .NET

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