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// Copyright (c) Microsoft Corporation. All rights reserved. See License.txt in the project root for license information.
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Web.WebPages.Html;
namespace System.Web.WebPages
{
// Class for containing various pieces of data required by a WebPage
public class WebPageContext
{
private static readonly object _sourceFileKey = new object();
private Stack<TextWriter> _outputStack;
private Stack<Dictionary<string, SectionWriter>> _sectionWritersStack;
private IDictionary<object, dynamic> _pageData;
private ValidationHelper _validation;
private ModelStateDictionary _modelStateDictionary;
public WebPageContext()
: this(context: null, page: null, model: null)
{
}
public WebPageContext(HttpContextBase context, WebPageRenderingBase page, object model)
{
HttpContext = context;
Page = page;
Model = model;
}
public static WebPageContext Current
{
get
{
// The TemplateStack stores instances of WebPageRenderingBase.
// Retrieve the top-most item from the stack and cast it to WebPageBase.
var httpContext = Web.HttpContext.Current;
if (httpContext != null)
{
var contextWrapper = new HttpContextWrapper(httpContext);
var currentTemplate = TemplateStack.GetCurrentTemplate(contextWrapper);
var currentPage = (currentTemplate as WebPageRenderingBase);
return (currentPage == null) ? null : currentPage.PageContext;
}
return null;
}
}
internal HttpContextBase HttpContext { get; set; }
public object Model { get; internal set; }
internal ModelStateDictionary ModelState
{
get
{
if (_modelStateDictionary == null)
{
_modelStateDictionary = new ModelStateDictionary();
}
return _modelStateDictionary;
}
}
internal ValidationHelper Validation
{
get
{
if (_validation == null)
{
Debug.Assert(HttpContext != null, "HttpContext must be initalized for Validation to work.");
_validation = new ValidationHelper(HttpContext, ModelState);
}
return _validation;
}
private set { _validation = value; }
}
internal Action<TextWriter> BodyAction { get; set; }
internal Stack<TextWriter> OutputStack
{
get
{
if (_outputStack == null)
{
_outputStack = new Stack<TextWriter>();
}
return _outputStack;
}
set { _outputStack = value; }
}
public WebPageRenderingBase Page { get; internal set; }
public IDictionary<object, dynamic> PageData
{
get
{
if (_pageData == null)
{
_pageData = new PageDataDictionary<dynamic>();
}
return _pageData;
}
internal set { _pageData = value; }
}
internal Stack<Dictionary<string, SectionWriter>> SectionWritersStack
{
get
{
if (_sectionWritersStack == null)
{
_sectionWritersStack = new Stack<Dictionary<string, SectionWriter>>();
}
return _sectionWritersStack;
}
set { _sectionWritersStack = value; }
}
// NOTE: We use a hashset because order doesn't matter and we want to eliminate duplicates
internal HashSet<string> SourceFiles
{
get
{
HashSet<string> sourceFiles = HttpContext.Items[_sourceFileKey] as HashSet<string>;
if (sourceFiles == null)
{
sourceFiles = new HashSet<string>();
HttpContext.Items[_sourceFileKey] = sourceFiles;
}
return sourceFiles;
}
}
internal static WebPageContext CreateNestedPageContext<TModel>(WebPageContext parentContext, IDictionary<object, dynamic> pageData, TModel model, bool isLayoutPage)
{
var nestedContext = new WebPageContext
{
HttpContext = parentContext.HttpContext,
OutputStack = parentContext.OutputStack,
Validation = parentContext.Validation,
PageData = pageData,
Model = model,
};
if (isLayoutPage)
{
nestedContext.BodyAction = parentContext.BodyAction;
nestedContext.SectionWritersStack = parentContext.SectionWritersStack;
}
return nestedContext;
}
}
}
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