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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.IO;
using System.Security.Principal;
using System.Web.Caching;
using System.Web.WebPages.Html;
using System.Web.WebPages.Instrumentation;
namespace System.Web.WebPages
{
[SuppressMessage("Microsoft.Design", "CA1053:StaticHolderTypesShouldNotHaveConstructors", Justification = "Even though this is essentially a static class, we need helper classes to inherit from it to get their static methods")]
public class HelperPage
{
private static WebPageContext _pageContext;
private static InstrumentationService _instrumentationService = null;
private static InstrumentationService InstrumentationService
{
get
{
if (_instrumentationService == null)
{
_instrumentationService = new InstrumentationService();
}
return _instrumentationService;
}
}
public static HttpContextBase Context
{
get { return new HttpContextWrapper(HttpContext.Current); }
}
public static WebPageRenderingBase CurrentPage
{
get { return PageContext.Page; }
}
public static dynamic Page
{
get { return CurrentPage.Page; }
}
public static dynamic Model
{
get
{
WebPage currentWebPage = CurrentPage as WebPage;
if (currentWebPage == null)
{
return null;
}
return currentWebPage.Model;
}
}
public static ModelStateDictionary ModelState
{
get
{
WebPage currentWebPage = CurrentPage as WebPage;
if (currentWebPage == null)
{
return null;
}
return currentWebPage.ModelState;
}
}
public static HtmlHelper Html
{
get
{
WebPage currentWebPage = CurrentPage as WebPage;
if (currentWebPage == null)
{
return null;
}
return currentWebPage.Html;
}
}
public static WebPageContext PageContext
{
get { return _pageContext ?? WebPageContext.Current; }
set { _pageContext = value; }
}
public static HttpApplicationStateBase AppState
{
get
{
if (Context != null)
{
return Context.Application;
}
return null;
}
}
public static dynamic App
{
get { return CurrentPage.App; }
}
public static string VirtualPath
{
get { return PageContext.Page.VirtualPath; }
}
public static Cache Cache
{
get
{
if (Context != null)
{
return Context.Cache;
}
return null;
}
}
public static HttpRequestBase Request
{
get
{
if (Context != null)
{
return Context.Request;
}
return null;
}
}
public static HttpResponseBase Response
{
get
{
if (Context != null)
{
return Context.Response;
}
return null;
}
}
public static HttpServerUtilityBase Server
{
get
{
if (Context != null)
{
return Context.Server;
}
return null;
}
}
public static HttpSessionStateBase Session
{
get
{
if (Context != null)
{
return Context.Session;
}
return null;
}
}
public static IList<string> UrlData
{
get { return CurrentPage.UrlData; }
}
public static IPrincipal User
{
get { return CurrentPage.User; }
}
public static bool IsPost
{
get { return CurrentPage.IsPost; }
}
public static bool IsAjax
{
get { return CurrentPage.IsAjax; }
}
public static IDictionary<object, dynamic> PageData
{
get { return PageContext.PageData; }
}
protected static string HelperVirtualPath { get; set; }
public static string Href(string path, params object[] pathParts)
{
return CurrentPage.Href(path, pathParts);
}
public static void WriteTo(TextWriter writer, object value)
{
WebPageBase.WriteTo(writer, value);
}
public static void WriteLiteralTo(TextWriter writer, object value)
{
WebPageBase.WriteLiteralTo(writer, value);
}
public static void WriteTo(TextWriter writer, HelperResult value)
{
WebPageBase.WriteTo(writer, value);
}
public static void WriteLiteralTo(TextWriter writer, HelperResult value)
{
WebPageBase.WriteLiteralTo(writer, value);
}
public static void WriteAttributeTo(TextWriter writer, string name, PositionTagged<string> prefix, PositionTagged<string> suffix, params AttributeValue[] values)
{
CurrentPage.WriteAttributeTo(VirtualPath, writer, name, prefix, suffix, values);
}
public static void BeginContext(string virtualPath, int startPosition, int length, bool isLiteral)
{
BeginContext(PageContext.Page.GetOutputWriter(), virtualPath, startPosition, length, isLiteral);
}
public static void BeginContext(TextWriter writer, string virtualPath, int startPosition, int length, bool isLiteral)
{
// Double check that the instrumentation service is active because WriteAttribute always calls this
if (InstrumentationService.IsAvailable)
{
InstrumentationService.BeginContext(Context,
virtualPath,
writer,
startPosition,
length,
isLiteral);
}
}
public static void EndContext(string virtualPath, int startPosition, int length, bool isLiteral)
{
EndContext(PageContext.Page.GetOutputWriter(), virtualPath, startPosition, length, isLiteral);
}
public static void EndContext(TextWriter writer, string virtualPath, int startPosition, int length, bool isLiteral)
{
// Double check that the instrumentation service is active because WriteAttribute always calls this
if (InstrumentationService.IsAvailable)
{
InstrumentationService.EndContext(Context,
virtualPath,
writer,
startPosition,
length,
isLiteral);
}
}
}
}
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