ExtenderControl.cs source code in C# .NET

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

namespace System.Web.UI { 
    using System; 
    using System.Collections.Generic;
    using System.ComponentModel; 
    using System.Diagnostics.CodeAnalysis;
    using System.Globalization;
    using System.Web;
    using System.Web.UI; 
    using System.Web.Resources;
    using System.Web.Util; 
 
    [
    DefaultProperty("TargetControlID"), 
    Designer("System.Web.UI.Design.ExtenderControlDesigner, " + AssemblyRef.SystemWebExtensionsDesign),
    NonVisualControl(),
    ParseChildren(true),
    PersistChildren(false), 
    ToolboxItem("System.Web.UI.Design.ExtenderControlToolboxItem, " + AssemblyRef.SystemWebExtensionsDesign),
    ] 
    public abstract class ExtenderControl : Control, IExtenderControl { 
        private string _targetControlID;
        private IScriptManagerInternal _scriptManager; 
        private new IPage _page;

        protected ExtenderControl() {
        } 

        internal ExtenderControl(IScriptManagerInternal scriptManager, IPage page) { 
            _scriptManager = scriptManager; 
            _page = page;
        } 

        private IPage IPage {
            get {
                if (_page != null) { 
                    return _page;
                } 
                else { 
                    Page page = Page;
                    if (page == null) { 
                        throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull);
                    }
                    return new PageWrapper(page);
                } 
            }
        } 
 
        private IScriptManagerInternal ScriptManager {
            get { 
                if (_scriptManager == null) {
                    Page page = Page;
                    if (page == null) {
                        throw new InvalidOperationException(AtlasWeb.Common_PageCannotBeNull); 
                    }
                    _scriptManager = System.Web.UI.ScriptManager.GetCurrent(page); 
                    if (_scriptManager == null) { 
                        throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
                            AtlasWeb.Common_ScriptManagerRequired, ID)); 
                    }
                }
                return _scriptManager;
            } 
        }
 
        [ 
        Category("Behavior"),
        DefaultValue(""), 
        IDReferenceProperty,
        ResourceDescription("ExtenderControl_TargetControlID"),
        SuppressMessage("Microsoft.Naming", "CA1709:IdentifiersShouldBeCasedCorrectly", MessageId = "ID"),
        ] 
        public string TargetControlID {
            get { 
                return (_targetControlID == null) ? String.Empty : _targetControlID; 
            }
            set { 
                _targetControlID = value;
            }
        }
 
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        EditorBrowsable(EditorBrowsableState.Never)
        ] 
        public override bool Visible {
            get {
                return base.Visible;
            } 
            set {
                throw new NotImplementedException(); 
            } 
        }
 
        /// 
        /// Finds the closest UpdatePanel in the parent controls of the specified control.
        /// 
        /// The control for which we want the closest UpdatePanel. 
        /// An UpdatePanel or null if none was found.
        private static UpdatePanel FindUpdatePanel(Control control) { 
            Control parent = control.Parent; 
            while (parent != null) {
                UpdatePanel parentPanel = parent as UpdatePanel; 
                if (parentPanel != null) {
                    return parentPanel;
                }
                parent = parent.Parent; 
            }
            return null; 
        } 

        [SuppressMessage("Microsoft.Security", "CA2109:ReviewVisibleEventHandlers")] 
        protected internal override void OnPreRender(EventArgs e) {
            base.OnPreRender(e);
            RegisterWithScriptManager();
        } 

        private void RegisterWithScriptManager() { 
            if (String.IsNullOrEmpty(TargetControlID)) { 
                throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
                    AtlasWeb.ExtenderControl_TargetControlIDEmpty, ID)); 
            }

            Control targetControl = FindControl(TargetControlID);
            if (targetControl == null) { 
                throw new InvalidOperationException(String.Format(CultureInfo.InvariantCulture,
                    AtlasWeb.ExtenderControl_TargetControlIDInvalid, ID, TargetControlID)); 
            } 

            // Check if the target control and its extender are in the same UpdatePanel if any: 
            if (FindUpdatePanel(this) != FindUpdatePanel(targetControl)) {
                throw new InvalidOperationException(AtlasWeb.ExtenderControl_TargetControlDifferentUpdatePanel);
            }
 
            ScriptManager.RegisterExtenderControl(this, targetControl);
        } 
 
        protected internal override void Render(HtmlTextWriter writer) {
            base.Render(writer); 

            // DevDiv 97460: ScriptDescriptors only render if in server form, verify to avoid silently failing.
            IPage.VerifyRenderingInServerForm(this);
 
            // ScriptManager cannot be found in DesignMode, so do not attempt to register scripts.
            if (!DesignMode) { 
                ScriptManager.RegisterScriptDescriptors(this); 
            }
        } 

        protected abstract IEnumerable GetScriptDescriptors(Control targetControl);

        [SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate", 
            Justification = "Implementation will likely return a new collection, which is too slow for a property")]
        protected abstract IEnumerable GetScriptReferences(); 
 
        #region IExtenderControl Members
        IEnumerable IExtenderControl.GetScriptDescriptors(Control targetControl) { 
            return GetScriptDescriptors(targetControl);
        }

        IEnumerable IExtenderControl.GetScriptReferences() { 
            return GetScriptReferences();
        } 
        #endregion 
    }
} 

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

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
ExtenderControl.cs source code in C# .NET

Source code for the .NET framework in C#

Code:

Link Menu
