ContentPlaceHolder.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 / ContentPlaceHolder.cs / 1305376 / ContentPlaceHolder.cs

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.Collections; 
    using System.ComponentModel;
    using System.Web.UI;
    using System.Web.Util;
 
    internal class ContentPlaceHolderBuilder : ControlBuilder {
 
        private string _contentPlaceHolderID; 
        private string _templateName;
 
        internal string Name { get { return _templateName; } }

        public override void Init(TemplateParser parser, ControlBuilder parentBuilder,
                                  Type type, string tagName, string ID, IDictionary attribs) { 

            // Copy the ID so that it will be available when BuildObject is called 
            _contentPlaceHolderID = ID; 

            if (parser.FInDesigner) { 
                // shortcut for designer
                base.Init(parser, parentBuilder, type, tagName, ID, attribs);
                return;
            } 

            if (String.IsNullOrEmpty(ID)) { 
                throw new HttpException(SR.GetString(SR.Control_Missing_Attribute, "ID", type.Name)); 
            }
 
            _templateName = ID;

            MasterPageParser masterPageParser = parser as MasterPageParser;
            if (masterPageParser == null) { 
                throw new HttpException(SR.GetString(SR.ContentPlaceHolder_only_in_master));
            } 
 
 			base.Init(parser, parentBuilder, type, tagName, ID, attribs);
 
            if (masterPageParser.PlaceHolderList.Contains(Name))
                throw new HttpException(SR.GetString(SR.ContentPlaceHolder_duplicate_contentPlaceHolderID, Name));

            masterPageParser.PlaceHolderList.Add(Name); 
        }
 
        public override object BuildObject() { 
            MasterPage masterPage = TemplateControl as MasterPage;
 
            Debug.Assert(masterPage != null || InDesigner);

            // Instantiate the ContentPlaceHolder
            ContentPlaceHolder cph = (ContentPlaceHolder) base.BuildObject(); 

            // If the page is providing content, instantiate it in the holder 
            if (PageProvidesMatchingContent(masterPage)) { 
                ITemplate tpl = ((System.Web.UI.ITemplate)(masterPage.ContentTemplates[_contentPlaceHolderID]));
                masterPage.InstantiateInContentPlaceHolder(cph, tpl); 
            }

            return cph;
        } 

        internal override void BuildChildren(object parentObj) { 
 
            MasterPage masterPage = TemplateControl as MasterPage;
 
            // If the page is providing content, don't call the base, which would
            // instantiate the default content (which we don't want)
            if (PageProvidesMatchingContent(masterPage))
                return; 

            base.BuildChildren(parentObj); 
        } 

        private bool PageProvidesMatchingContent(MasterPage masterPage) { 

            if (masterPage != null && masterPage.ContentTemplates != null
                        && masterPage.ContentTemplates.Contains(_contentPlaceHolderID)) {
                return true; 
            }
 
            return false; 
        }
    } 

    // Factory used to efficiently create builder instances
    internal class ContentPlaceHolderBuilderFactory: IWebObjectFactory {
        object IWebObjectFactory.CreateInstance() { 
            return new ContentPlaceHolderBuilder();
        } 
    } 

    [ControlBuilderAttribute(typeof(ContentPlaceHolderBuilder))] 
    [Designer("System.Web.UI.Design.WebControls.ContentPlaceHolderDesigner, " + AssemblyRef.SystemDesign)]
    [ToolboxItemFilter("System.Web.UI")]
    [ToolboxItemFilter("Microsoft.VisualStudio.Web.WebForms.MasterPageWebFormDesigner", ToolboxItemFilterType.Require)]
    [ToolboxData("<{0}:ContentPlaceHolder runat=\"server\">")] 

    public class ContentPlaceHolder : Control, INonBindingContainer { 
    } 
}

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

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