Code Access Security - System.Security .SecurityExcept ion: Request failed.

[Chris Crowe [MVP 2005/2006]]

I have written a Web User Control that runs inside of Sharepoint, but when I
want to use a custom convertor class to convert an XML attribute I get the
following error:

System.Security .SecurityExcept ion: Request failed.

Basically I start with a DataSet that I then want to transform into HTML via
an XSL stylesheet.

I do not appear to be able to use the XsltArgumentLis t Extension Object.

From what I have found this object requires FULL TRUST.

If I comment out the args.AddExtensi onObject("urn:t rimble-date",

Convertor); the code works fine.

This code basically installs an extension object which in my case converts
date/times to a format that I want to use in my XSL

To make this worse this needs to run as part of a sharepoint application.

I have tried adjusting the security on the DLL that this code is part of and
it does not help.

Does anyone have any thoughts?

try

{

XmlDataDocument datadoc = new XmlDataDocument (ds);

XslTransform myXslTrans = new XslTransform() ;

myXslTrans.Load (XSLFileSpec);

// Add an object to convert DateTime format.

HelpdeskDateCon vertor Convertor = new HelpdeskDateCon vertor();

XsltArgumentLis t args = new XsltArgumentLis t();

args.AddExtensi onObject("urn:t rimble-date", Convertor);

myXslTrans.Tran sform(datadoc,n ull, stWrite,null);

}

catch(Exception ex)

{

stWrite.Write(e x.ToString());

}

Chris