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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.CodeAnalysis;
using System.Linq;
using System.Web.WebPages.Html;
using System.Web.WebPages.Scope;
namespace System.Web.WebPages
{
[SuppressMessage("Microsoft.Maintainability", "CA1506:AvoidExcessiveClassCoupling", Justification = "This is a core class which needs to have references to many other classes")]
public abstract class WebPage : WebPageBase
{
private static readonly List<IWebPageRequestExecutor> _executors = new List<IWebPageRequestExecutor>();
private HttpContextBase _context;
// Expose the model as dynamic
private dynamic _model;
// True if this is a 'top level' page (URL addressable), vs a 'satellite' page like a user control or master
internal bool TopLevelPage { get; set; }
public override HttpContextBase Context
{
get
{
if (_context == null)
{
return PageContext.HttpContext;
}
return _context;
}
set { _context = value; }
}
public HtmlHelper Html { get; private set; }
public ValidationHelper Validation
{
get { return PageContext.Validation; }
}
public dynamic Model
{
get
{
if (_model == null)
{
// Instead of directly returning the model, we wrap it in our own custom DynamicObject.
// This allows it to perform private reflection, which would normally fail. This is useful
// when dealing with anonymous objects, which are always internal
_model = ReflectionDynamicObject.WrapObjectIfInternal(PageContext.Model);
}
return _model;
}
}
public ModelStateDictionary ModelState
{
get { return PageContext.ModelState; }
}
public static void RegisterPageExecutor(IWebPageRequestExecutor executor)
{
_executors.Add(executor);
}
public override void ExecutePageHierarchy()
{
using (ScopeStorage.CreateTransientScope(new ScopeStorageDictionary(ScopeStorage.CurrentScope, PageData)))
{
ExecutePageHierarchy(_executors);
}
}
internal void ExecutePageHierarchy(IEnumerable<IWebPageRequestExecutor> executors)
{
// Call all the executors until we find one that wants to handle it. This is used to implement features
// such as AJAX Page methods without having to bake them into the framework.
// Note that we only do this for 'top level' pages, as these are request-level executors that should not run for each user control/master
if (!TopLevelPage || !executors.Any(executor => executor.Execute(this)))
{
// No executor handled the request, so use normal processing
base.ExecutePageHierarchy();
}
}
public override HelperResult RenderPage(string path, params object[] data)
{
return base.RenderPage(path, data);
}
protected override void InitializePage()
{
base.InitializePage();
Html = new HtmlHelper(ModelState, Validation);
}
}
}
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