MasterPage.cs source code in C# .NET

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

/* 
 * MasterPage class definition 
 *
 * Copyright (c) 1998 Microsoft Corporation 
 */

namespace System.Web.UI {
 
    using System;
    using System.Collections; 
    using System.Collections.Specialized; 
    using System.ComponentModel;
    using System.ComponentModel.Design; 
    using System.Globalization;
    using System.Security.Permissions;
    using System.Reflection;
    using System.Web.Hosting; 
    using System.Web.Compilation;
    using System.Web.UI.WebControls; 
    using System.Web.Util; 

    public class MasterPageControlBuilder : UserControlControlBuilder { 
        internal static readonly String AutoTemplatePrefix = "Template_";
    }

 
    /// 
    ///    Default ControlBuilder used to parse master page files. Note that this class inherits from FileLevelPageControlBuilder 
    ///    to reuse masterpage handling code. 
    /// 
    public class FileLevelMasterPageControlBuilder: FileLevelPageControlBuilder { 

        internal override void AddContentTemplate(object obj, string templateName, ITemplate template) {
            MasterPage master = (MasterPage)obj;
            master.AddContentTemplate(templateName, template); 
        }
    } 
 

    ///  
    ///    This class is not marked as abstract, because the VS designer
    ///          needs to instantiate it when opening .master files
    /// 
    [ 
    Designer("Microsoft.VisualStudio.Web.WebForms.MasterPageWebFormDesigner, " + AssemblyRef.MicrosoftVisualStudioWeb, typeof(IRootDesigner)),
    ControlBuilder(typeof(MasterPageControlBuilder)), 
    ParseChildren(false) 
    ]
    public class MasterPage : UserControl { 

        private VirtualPath _masterPageFile;
        private MasterPage _master;
 
        // The collection used to store the templates created on the content page.
        private IDictionary _contentTemplates; 
 
        // The collection used to store the content templates defined in MasterPage.
        private IDictionary _contentTemplateCollection; 
        private IList _contentPlaceHolders;

        private bool _masterPageApplied;
 
        // The page or masterpage that hosts this masterPage.
        internal TemplateControl _ownerControl; 
 

        public MasterPage() { 
        }


        ///  
        ///    Dictionary used to store the content templates that are passed in from the content pages.
        ///  
        [Browsable(false)] 
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected internal IDictionary ContentTemplates { 
            get {
                return _contentTemplates;
            }
        } 

 
        [Browsable(false)] 
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected internal IList ContentPlaceHolders { 
            get {
                if (_contentPlaceHolders == null) {
                    _contentPlaceHolders = new ArrayList();
                } 

                return _contentPlaceHolders; 
            } 
        }
 

        /// 
        ///    The MasterPage used by this nested MasterPage control.
        ///  
        [
        Browsable(false), 
        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
        WebSysDescription(SR.MasterPage_MasterPage)
        ] 
        public MasterPage Master {
            get {
                if (_master == null && !_masterPageApplied) {
                    _master = MasterPage.CreateMaster(this, Context, _masterPageFile, _contentTemplateCollection); 
                }
 
                return _master; 
            }
        } 


        /// 
        ///    Gets and sets the masterPageFile of this control. 
        /// 
        [ 
        DefaultValue(""), 
        WebCategory("Behavior"),
        WebSysDescription(SR.MasterPage_MasterPageFile) 
        ]
        public string MasterPageFile {
            get {
                return VirtualPath.GetVirtualPathString(_masterPageFile); 
            }
            set { 
                if (_masterPageApplied) { 
                    throw new InvalidOperationException(SR.GetString(SR.PropertySetBeforePageEvent, "MasterPageFile", "Page_PreInit"));
                } 

                if (value != VirtualPath.GetVirtualPathString(_masterPageFile)) {
                    _masterPageFile = VirtualPath.CreateAllowNull(value);
 
                    if (_master != null && Controls.Contains(_master)) {
                        Controls.Remove(_master); 
                    } 
                    _master = null;
                } 
            }
        }

 
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        protected internal void AddContentTemplate(string templateName, ITemplate template) { 
            if (_contentTemplateCollection == null) { 
                _contentTemplateCollection = new Hashtable(10, StringComparer.OrdinalIgnoreCase);
            } 

            try {
                _contentTemplateCollection.Add(templateName, template);
            } 
            catch (ArgumentException) {
                throw new HttpException(SR.GetString(SR.MasterPage_Multiple_content, templateName)); 
            } 
        }
 
        internal static MasterPage CreateMaster(TemplateControl owner, HttpContext context,
            VirtualPath masterPageFile, IDictionary contentTemplateCollection) {

            Debug.Assert(owner is MasterPage || owner is Page); 

            MasterPage master = null; 
 
            if (masterPageFile == null) {
                if (contentTemplateCollection != null && contentTemplateCollection.Count > 0) { 
                    throw new HttpException(SR.GetString(SR.Content_only_allowed_in_content_page));
                }

                return null; 
            }
 
            // If it's relative, make it *app* relative.  Treat is as relative to this 
            // user control (ASURT 55513)
            VirtualPath virtualPath = VirtualPathProvider.CombineVirtualPathsInternal( 
                owner.TemplateControlVirtualPath, masterPageFile);

            // Compile the declarative control and get its Type
            ITypedWebObjectFactory result = (ITypedWebObjectFactory)BuildManager.GetVPathBuildResult( 
                context, virtualPath);
 
            // Make sure it has the correct base type 
            if (!typeof(MasterPage).IsAssignableFrom(result.InstantiatedType)) {
                throw new HttpException(SR.GetString(SR.Invalid_master_base, 
                    masterPageFile));
            }

            master = (MasterPage)result.CreateInstance(); 

            master.TemplateControlVirtualPath = virtualPath; 
 
            if (owner.HasControls()) {
                foreach (Control control in owner.Controls) { 
                    LiteralControl literal = control as LiteralControl;
                    if (literal == null || Util.FirstNonWhiteSpaceIndex(literal.Text) >= 0) {
                        throw new HttpException(SR.GetString(SR.Content_allowed_in_top_level_only));
                    } 
                }
 
                // Remove existing controls. 
                owner.Controls.Clear();
            } 

            // Make sure the control collection is writable.
            if (owner.Controls.IsReadOnly) {
                throw new HttpException(SR.GetString(SR.MasterPage_Cannot_ApplyTo_ReadOnly_Collection)); 
            }
 
            if (contentTemplateCollection != null) { 
                foreach(String contentName in contentTemplateCollection.Keys) {
                    if (!master.ContentPlaceHolders.Contains(contentName.ToLower(CultureInfo.InvariantCulture))) { 
                        throw new HttpException(SR.GetString(
                            SR.MasterPage_doesnt_have_contentplaceholder, contentName, masterPageFile));
                    }
                } 
                master._contentTemplates = contentTemplateCollection;
            } 
 
            master._ownerControl = owner;
            master.InitializeAsUserControl(owner.Page); 
            owner.Controls.Add(master);
            return master;
        }
 
        internal static void ApplyMasterRecursive(MasterPage master, IList appliedMasterFilePaths) {
 
            Debug.Assert(appliedMasterFilePaths != null); 

            // Recursively apply master pages to the nested masterpages. 
            if (master.Master != null) {

                string pageFile = master._masterPageFile.VirtualPathString.ToLower(CultureInfo.InvariantCulture);
                if (appliedMasterFilePaths.Contains(pageFile)) { 
                    throw new InvalidOperationException(SR.GetString(SR.MasterPage_Circular_Master_Not_Allowed, master._masterPageFile));
                } 
 
                appliedMasterFilePaths.Add(pageFile);
 
                ApplyMasterRecursive(master.Master, appliedMasterFilePaths);
            }

            master._masterPageApplied = true; 
        }
 
        public void InstantiateInContentPlaceHolder(Control contentPlaceHolder, ITemplate template) { 
            HttpContext context = HttpContext.Current;
 
            // Remember the old TemplateControl
            TemplateControl oldControl = context.TemplateControl;

            // Storing the template control into the context 
            // since each thread needs to set it differently.
            context.TemplateControl = _ownerControl; 
 
            try {
                // Instantiate the template using the correct TemplateControl 
                template.InstantiateIn(contentPlaceHolder);
            }
            finally {
                // Revert back to the old templateControl 
                context.TemplateControl = oldControl;
            } 
        } 
    }
} 

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

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