XslLoadException: Resolving of external URIs was prohibited

Question

I have xslt sheet the have include tags for another xslt files, the all files compiled right and error free but when run the following code i got exception

var myXslTrans = new XslCompiledTransform();
XsltSettings sets = new XsltSettings();
sets.EnableScript = true;
myXslTrans.Load("visio.xsl",sets,null);
myXslTrans.Transform("page1.xml", "page.html");

following the exception text and stacktrace:

System.Xml.Xsl.XslLoadException: 
  XSLT compile error. An error occurred \bin\Debug\visio.xsl(116,40). 
  ---> System.Xml.XmlException: Resolving of external URIs was prohibited.
    at System.Xml.Xsl.Xslt.XsltLoader.Load(XmlReader reader)
       at System.Xml.Xsl.Xslt.XsltLoader.Load(Compiler compiler, Object stylesheet, XmlResolver xmlResolver)
       at System.Xml.Xsl.Xslt.Compiler.Compile(Object stylesheet, XmlResolver xmlResolver, QilExpression& qil)
       at System.Xml.Xsl.XslCompiledTransform.LoadInternal(Object stylesheet, XsltSettings settings, XmlResolver stylesheetResolver)
       at System.Xml.Xsl.XslCompiledTransform.Load(String stylesheetUri, XsltSettings settings, XmlResolver stylesheetResolver)

I try to solve the problem by this but the problem still exist

Answer 1

Quotes from comments / updated question:

i copy the files to the project to use it, path variable to get the base directory for the app

Yes, but the path variable is not used, so it has not effect.

System.Xml.Xsl.XslLoadException: XSLT compile error. An error occurred \bin\Debug\visio.xsl(116,40). ---> System.Xml.XmlException: Resolving of external URIs was prohibited.

This may mean one or more of several things:

• Your settings do not allow loading external documents (this is the default for XslCompiledTransform, see documentation).
• Your stylesheet contains a URI either directly (through xsl:import, xsl:include, document()) or indirectly (via a DTD or to resolve external entities).
• If the above is not (entirely) true, at least the error points to exactly the point where the problem is. You didn't copy this in your question, but you will find it at (116, 40).

To resolve, just allow loading of external documents:

Replace this:

XsltSettings sets = new XsltSettings();
sets.EnableScript = true;

with this:

XsltSettings sets = new XsltSettings(true, true);

Update (after your comment)

I noticed another thing. You are setting the last argument to null, which according to Microsoft should give you a ArgumentNullException. It is not allowed to be null, but apparently Microsoft now allows it but then it has the effect that the UriResolver cannot resolve anything, because hey, it is null...

Not quite sure why you set it to null, but try setting it to a valid value, i.e.:

var resolver = new XmlUrlResolver();
myXslTrans.Load("visio.xsl", sets, resolver);