ITemplate parsing order issueRSS

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  Owen Byrne

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  ITemplate parsing order issue

  Aug 12, 2011 06:49 PM|Owen Byrne|LINK

  Hi there,

  I've created a custom server control with a few ITemplate inner properties.  I'd like to allow for mixed use of these template tags like this:

  <x:CustomTag>
       <Tem1>First</Tem1>
       <Tem2>Second</Tem2>
       <Tem1>Third</Tem1>
       <Tem2>Fourth</Tem2>
  </x:CustomTag>

  Unfortunately, the ITemplate property setters are called in a different order than the template tags in the markup. The parser seems to see a Tem1 tag first, so it runs a setter for all the Tem1 tags, then for all the Tem2 tags. The result is: First, Third, Second, Fourth.

  Is there a way to retain the order of template tags when their setters are called, or alternately a way within the setter to find the location in the aspx of the tag that initiated the setter?  Or am I missing something?

  Thanks very much.

• • Reply
  Decker Dong...

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  Re: ITemplate parsing order issue

  Aug 13, 2011 11:48 PM|Decker Dong - MSFT|LINK

  Owen Byrne

  Is there a way to retain the order of template tags when their setters are called, or alternately a way within the setter to find the location in the aspx of the tag that initiated the setter?  Or am I missing something?

  Hello：）

  Not very clear about what you say……

  Would you mind showing us your screenshot about the actual result and plz tell us what you are expecting....

  Thx again

• • Reply
  Owen Byrne

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  Re: ITemplate parsing order issue

  Aug 15, 2011 05:04 PM|Owen Byrne|LINK

  Hi there,

  Here's an example:

  index.aspx:

  <%@ Register TagPrefix="tl" Namespace="CustomTagTest1" Assembly="CustomTagTest1" %>
  <tl:CustomTag runat="server">
      <Template1>First</Template1>
      <Template2>Second</Template2>
      <Template1>Third</Template1>
      <Template2>Fourth</Template2>
  </tl:CustomTag>

  CustomTag.cs:

  using System.Collections.Generic;
  using System.Web.UI;
  using System.Web.UI.WebControls;
  
  namespace CustomTagTest1
  {
      [ParseChildren(true), PersistChildren(false)]
      public class CustomTag : WebControl
      {
          private List<ITemplate> list = new List<ITemplate>();
  
          [PersistenceMode(PersistenceMode.InnerProperty)]
          [TemplateContainer(typeof(TemplateInstance))]
          public ITemplate Template1 { set { list.Add(value); } }
  
          [PersistenceMode(PersistenceMode.InnerProperty)]
          [TemplateContainer(typeof(TemplateInstance))]
          public ITemplate Template2 { set { list.Add(value); } }
  
          protected override void CreateChildControls()
          {
              foreach (ITemplate t in list)
              {
                  TemplateInstance i = new TemplateInstance();
                  t.InstantiateIn(i);
                  Controls.Add(i);
              }
          }
      }
  
      public class TemplateInstance : WebControl, INamingContainer
      {
          protected override void Render(HtmlTextWriter writer) { RenderContents(writer); }
      }

  Expected Result:

  FirstSecondThirdFourth

  Actual Result:

  FirstThirdSecondFourth

  I would expect the parser to run the ITemplate setters in the order they exist in the markup, but it doesn't.  I can provide a more real-world example if this doesn't help clarify things.

  Thanks again!

• • Reply
  jkirkerx

  Contributor

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  855 Posts

  Re: ITemplate parsing order issue

  Aug 17, 2011 12:16 AM|jkirkerx|LINK

  There not custom tags

  It's a control collection.

  You have to build a control collection to properly access the internal tags. It takes about 3 pages of code to construct.

  Google control collection for more information. I would list examples, but it would be like 10 feet long in space.