.NET Framework 2.0 SP1 - TagMapping Undocumented hotfix

Thursday, January 17, 2008

.NET ASP.NET

While searching a way to solve the HtmlControls tag mapping problem I found that the new SP1 bring an extra undocumented hotfix.

This undocumented hotfix changes MainTagNameToTypeMapper.GetControlType method so that, for every tag name regardless is kind, a tag type mapping is always performed.

This little change enables us to tag map HtmlControls the same way we map WebControls and UserControls. Here is an example: [more]

  <system.web>
    <pages>
      <tagMapping>
        <add tagType="System.Web.UI.HtmlControls.HtmlForm, System.Web, Version=2.0.0.0"
          mappedTagType="tagmapping.controls.Form, tagmapping" />
      </tagMapping>
    </pages>
  </system.web>

This tag mapping problem is also fixed for .NET Framework 3.5.

For those of you who still use .NETFX 2.0 without SP1 the only solution I found available is:

  <system.web>
    <pages>
      <controls>
        <add tagPrefix="html" namespace="System.Web.UI.HtmlControls" 
             assembly="System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"/>
      </controls>
      <tagMapping>
        <add tagType="System.Web.UI.HtmlControls.HtmlForm, System.Web, Version=2.0.0.0"
             mappedTagType="tagmapping.controls.Form, tagmapping" />
        </tagMapping>
    </pages>
  </system.web>

Then you should replace the <form> tag with an <html:HtmlForm> tag in your pages.

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