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//------------------------------------------------------------------------------
// <copyright file="AdPostCacheSubstitution.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
/*
* The class is used internally to handle post-cache substitution mechanism in
* AdRotator.
*
* Copyright (c) 2002 Microsoft Corporation
*/
namespace System.Web.UI.WebControls {
using System.Globalization;
using System.IO;
using System.Web.Util;
internal class AdPostCacheSubstitution {
private AdRotator _adRotatorHelper;
private AdPostCacheSubstitution() {}
internal AdPostCacheSubstitution(AdRotator adRotator) {
_adRotatorHelper = new AdRotator();
_adRotatorHelper.CopyFrom(adRotator);
_adRotatorHelper.IsPostCacheAdHelper = true;
_adRotatorHelper.Page = new Page();
}
internal void RegisterPostCacheCallBack(HttpContext context,
Page page,
HtmlTextWriter writer) {
// Assumption: called from AdRotator's Render phase
HttpResponseSubstitutionCallback callback = new HttpResponseSubstitutionCallback(Render);
context.Response.WriteSubstitution(callback);
}
internal string Render(HttpContext context) {
//
Debug.Assert(_adRotatorHelper != null && _adRotatorHelper.Page != null);
// In PostCache Substitution, we use a string writer to return the markup.
StringWriter stringWriter = new StringWriter(CultureInfo.CurrentCulture);
HtmlTextWriter htmlWriter = _adRotatorHelper.Page.CreateHtmlTextWriter(stringWriter);
Debug.Assert(htmlWriter != null);
_adRotatorHelper.RenderControl(htmlWriter);
// Dump the content out as needed for post-cache substitution.
return stringWriter.ToString();
}
}
}
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