Use Telerik AJAX in Medium Trust

Environment

Product

Progress® Telerik® UI for ASP.NET AJAX

Description

How can I use Telerik UI for ASP.NET AJAX in Medium Trust?

Solution

When your application is running in Medium Trust and you want to use Telerik AJAX on your pages, you need to use any of the following approaches to make Telerik AJAX work properly. Note that in all cases when the application is running in Medium Trust, you can have only one Telerik AJAX control in the whole page hierarchy. Therefore, in complex Master/Content Page applications, it is recommended that you use a single AjaxManager on the Master page which will handle all available Ajax scenarios. This limitation is due to the fact that in Medium Trust the reflection permissions are not granted.

• Inherit your page from the RadAjaxPage as shown below:

  <div class='tabbedCode'><pre lang="C#"><code>
  public partial class MyPage: System.We.UI.Page {}
  //should be changed to:
  public partial class MyPage: Telerik.Web.UI.RadAjaxPage {}
  
  ````
  

          Partial Public Class MyPage
          Inherits System.We.UI.Page
      End Class
      'should be changed to:
      Partial Public Class MyPage
          Inherits Telerik.Web.UI.RadAjaxPage
      End Class
      ````
  

• Set the RestoreOriginalDelegate property of the Telerik AJAX control to false:

  <div class='tabbedCode'><pre lang="ASP.NET"><code>        &lt;telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" RestoreOriginalRenderDelegate="false"&gt;
  &lt;/telerik:RadAjaxManager&gt;
  
  Or
  
  &lt;telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" RestoreOriginalRenderDelegate="false"&gt;
  &lt;/telerik:RadAjaxPanel&gt;
  ````
  

• Implement the IRadAjaxPage interface:

  <div class='tabbedCode'><pre lang="C#"><code>        public class MyPage : System.Web.UI.Page, Telerik.Web.UI.IRadAjaxPage
  {
      private System.Web.UI.RenderMethod _onRenderDelegate;
      #region IRadAjaxPage Members
      public void AttachOnRender(System.Web.UI.RenderMethod renderMethod)
      {
          _onRenderDelegate = renderMethod;
      }
  ````
  

          Public Class MyPage
          Inherits System.Web.UI.Page
          Implements Telerik.Web.UI.IRadAjaxPage
          Private _onRenderDelegate As System.Web.UI.RenderMethod
  
      Public Sub AttachOnRender(ByVal renderMethod As System.Web.UI.RenderMethod)
          _onRenderDelegate = renderMethod
      End Sub
  
      Protected Overloads Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
          If Not _onRenderDelegate Is Nothing Then
              _onRenderDelegate(writer, Me)
          End If
          MyBase.Render(writer)
      End Sub
  End Class
  ````