WebPartZone.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebParts / WebPartZone.cs / 1 / WebPartZone.cs
                        

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

namespace System.Web.UI.WebControls.WebParts { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Security.Permissions;
    using System.Web.UI;
    using System.Web.UI.WebControls; 

    ///  
    /// Zone that hosts WebPart controls, and contains a template to specify the contained WebParts. 
    /// 
    [ 
    Designer("System.Web.UI.Design.WebControls.WebParts.WebPartZoneDesigner, " + AssemblyRef.SystemDesign),
    SupportsEventValidation,
    ]
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    public class WebPartZone : WebPartZoneBase { 
 
        private ITemplate _zoneTemplate;
        private bool _registrationComplete; 

        [
        Browsable(false),
        DefaultValue(null), 
        PersistenceMode(PersistenceMode.InnerProperty),
        TemplateInstance(TemplateInstance.Single) 
        ] 
        public virtual ITemplate ZoneTemplate {
            get { 
                return _zoneTemplate;
            }
            set {
                if (!DesignMode) { 
                    if (_registrationComplete) {
                        throw new InvalidOperationException(SR.GetString(SR.WebPart_SetZoneTemplateTooLate)); 
                    } 
                }
                _zoneTemplate = value; 
            }
        }

        private void AddWebPartToList(WebPartCollection webParts, Control control) { 
            WebPart part = control as WebPart;
 
            // We used to throw an exception if the template contained a non-whitespace literal. 
            // However, sometimes Venus would insert 
 tags between the server controls
            // in the template.  So, we now just ignore all literals. 
            if ((part == null) && !(control is LiteralControl)) {
                WebPartManager manager = WebPartManager;
                if (manager != null) {
                    part = manager.CreateWebPart(control); 
                }
                else { 
                    part = WebPartManager.CreateWebPartStatic(control); 
                }
            } 

            if (part != null) {
                webParts.Add(part);
            } 
        }
 
        protected internal override WebPartCollection GetInitialWebParts() { 
            WebPartCollection webParts = new WebPartCollection();
 
            if (ZoneTemplate != null) {
                // PERF: Instantiate the template into a special control, that does nothing when a child control
                // is added.  This is more performant because the child control is never parented to the temporary
                // control, it's ID is never generated, etc. 
                Control container = new NonParentingControl();
                ZoneTemplate.InstantiateIn(container); 
 
                if (container.HasControls()) {
                    ControlCollection controls = container.Controls; 
                    foreach (Control control in controls) {
                        if (control is ContentPlaceHolder) {
                            if (control.HasControls()) {
                                Control[] children = new Control[control.Controls.Count]; 
                                control.Controls.CopyTo(children, 0);
                                foreach (Control child in children) { 
                                    AddWebPartToList(webParts, child); 
                                }
                            } 
                        }
                        else {
                            AddWebPartToList(webParts, control);
                        } 
                    }
                } 
            } 

            return webParts; 
        }

        protected internal override void OnInit(EventArgs e) {
            base.OnInit(e); 
            _registrationComplete = true;
        } 
    } 
}

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