ExtenderControl.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / Orcas / RTM / ndp / fx / src / xsp / System / Web / Extensions / ui / ExtenderControl.cs / 1 / 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.Security.Permissions;
    using System.Web; 
    using System.Web.UI;
    using System.Web.Resources; 
    using System.Web.Util; 

    [ 
    AspNetHostingPermission(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal),
    AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal),
    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", "CA1706:ShortAcronymsShouldBeUppercase"), 
        ] 
        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.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ExtenderControl.cs source code in C# .NET

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