itext7 pdfHtml Xamarin.Forms 'Value cannot be null. Parameter name: assembly'

Question

When trying to generate a pdfHtml report in Xamarin.Forms using a .netStandard2 project, the exception System.ArgumentNullException: 'Value cannot be null. Prameter name: assembly.

This is the code that is run:

var assembly = Assembly.GetExecutingAssembly();
var resourceName = "Data.test.html";

using (Stream stream = assembly.GetManifestResourceStream(resourceName))
using (StreamReader reader = new StreamReader(stream))
using (FileStream pdfDest = File.Open(targetPath, FileMode.Create))
{
    string result = reader.ReadToEnd();
    ConverterProperties converterProperties = new ConverterProperties();
    HtmlConverter.ConvertToPdf(result, pdfDest, converterProperties);
}

The code works, when run in a .net6 console application.

Please do not post code or errors as images – Jason Nov 23 '22 at 11:10 — Jason, Nov 23 '22 at 11:10

Liqun Shen-MSFT · Answer 1 · 2022-11-25T05:49:11.087

You could check the resourceName. Please refer to Xamarin.Forms Can not Read Text file from Resources Returned Null. One way to get the resourceName of all the project is using:

assembly.GetManifestResourceNames() //get all resource

var resourcePath = assembly.GetManifestResourceNames()
        .Single(str => str.EndsWith("filename.html"));  // get your html resource

Also remember to set the build action of the file to EmbeddedResource.

Hope it works for you.

itext7 pdfHtml Xamarin.Forms 'Value cannot be null. Parameter name: assembly'

1 Answers1