Could not load file or assembly - biztalk

Question

I want to archive a pdf version of a DESADV, therefore I create a Html page via Biztalk Custom XSLT Mapping from the original XML file and render it via Pechkin.Synchronized to a pdf (wrapper for wkhtmltopdf).
This works like a charm in my Solution, but once I try to deploy the solution to the QA System biztalk keeps nagging that it can not find the Pechkin Library.
The Libs are deployed via "gacutil -I", I even build it from source and signed it with our Biztalk signing key and changed the build mode from x86 to "any CPU".
I added all the needed dlls to the Helper Class and deployed them also manually but BizTalk is unable to access the lib. Please help me, I am trying for days without making any progress and it makes me mad.
I even struggle to debug why it can not load the dll.
I am not so fluent in BizTalk and always thought that DLLs in the GAC are accessible to BizTalk...
I also build a console application, that directly references to the DLL in GAC_MSIL and the application renders the html with the exact code, I wrote in the BizTalk Solutions helper class.

Answer 1

even this can not be considered a real answer but it solved the problem somehow.
As already someone mentioned it, the DLL had dependencies onto other libs. This in combination that I was unable to deploy the DLL to the gac and no deeper understanding of the topic I simply chose another lib as this already took to much time. meh.
I choose the shareware https://selectpdf.com/community-edition/, they have a nuget package that simply worked. (i like). The overall render speed is not as good, but in the end it is more important to stay BizTalk compatible with your project I guess.
If someone stumbles upon this:
Create XSL Mapping for your Message XML and map it to some fancy
HTML layout (css supported)
Xtract XML from BizTalk Message in Orchestration
Render PDF with a Helper Solution
My code of the helper class:
You need to add the "Microsoft.XLANGs.BaseTypes" reference from References->Add reference->Assemblies->Extensions for it to work.
using System;
using Microsoft.XLANGs.BaseTypes;
using System.IO;
namespace BIS.CLC.DESADV.Helper
{
public class HtmlHelper
{
public string xTractStringFromMessage(XLANGMessage message)
{
string retVal = string.Empty;
try
{
using (var reader = new StreamReader(message[0].RetrieveAs(typeof(Stream)) as Stream))
{
retVal = reader.ReadToEnd();
}
}
catch (Exception ex)
{
Exception logex = new Exception("BIS.CLC.DESADV.Helper.HtmlHelper.xtractStringFromMsg: string extraction failed" + ex.Message.ToString() + ex.InnerException.ToString());
BIS.Common.Helper.StaticClass.writeEventLog_BizTalk(logex.Message.ToString(), "BisLog");
throw ex;
}
finally
{
message.Dispose();
}
return retVal;
}
public void renderPDFfromHTML(string html, string targetPath)
{
try
{
//do things
SelectPdf.HtmlToPdf converter = new SelectPdf.HtmlToPdf();
SelectPdf.PdfDocument doc = converter.ConvertHtmlString(html);
doc.Save(new Uri(targetPath).LocalPath.Replace(".XML", ".PDF"));
doc.Close();
}
catch (Exception ex)
{
Exception logex = new Exception("BIS.CLC.DESADV.Helper.HtmlHelper.renderPDFfromHTML: render pdf failed " + ex.Message.ToString() + ex.InnerException.ToString());
BIS.Common.Helper.StaticClass.writeEventLog_BizTalk(logex.Message.ToString(), "BisLog");
throw ex;
}
}
}
}