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DGN to PDF conversion exception in .NET

GroupDocs.Conversion Product Family
, ,
#1

Experimenting with the trial version, created a simple console app to convert a DGN file to a PDF file. Exception is GroupDocs.Conversion.ExceptionsGroupDocsConversionException - Object reference not set to an instance of an object.
I’m using a microstation file v8 exported back to v7
Console app is as follows:
using System;
using System.Drawing;

namespace ConvertToPdf
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine(“Hello World!”);
System.Diagnostics.Trace.Write(“running application”);
var converter = new GroupDocs.Conversion.Converter(“C:\tmp\txe20037.dgn”);
var convertOptions = converter.GetPossibleConversions()[“pdf”].ConvertOptions;
converter.Convert(“c:\tmp\converted.pdf”, convertOptions);ERROR HERE
}
}
}

#2

@jochanan1234

Please specify the API version (e.g. 20.1, 21.1) and share the problematic file with us. We’ll then investigate this issue.

#3

My download was GroupDocs.Conversion for .NET 21.2 MSI installer.
I’m not seeing any way to upload my .dgn file to you.

1 Like
#4

@jochanan1234

You’ve to compress the file to a ZIP format or in case of file size issue, you can upload it to some cloud storage (e.g. Google drive) and share link here.

#5

You can find the file at this link:
https://bartonmalow.box.com/s/x7335uu7bajxuh4fnbguqixjf4hi6noi

1 Like
#6

@jochanan1234

We cannot reproduce this issue using API version 21.2. Please have a look at this output.zip (1.3 MB). Could you please share a sample console application using that issue could be reproduced?

#7

I’ve sent you a link to my application .zip file.

#8

@jochanan1234

Could you please send the link again?

#9

https://bartonmalow.box.com/s/8i6ghmvb4an3xcvexuvnisaaunmygine

#10

Ok, I have my code working… now it crashes if I try to convert dgn to PDF using the Grayscale property. It works if I use options in the
converter.Convert(@“c:\tmp\converted.pdf”, options);
How do I implement the PdfOptions shown as part of the PdfConvertOptions class?

using GroupDocs.Conversion.Options.Convert;
using GroupDocs.Conversion.FileTypes;
using GroupDocs.Conversion.Contracts;

namespace ConvertToPdf
{
class Program
{
static void Main(string[] args)
{

        var converter = new GroupDocs.Conversion.Converter(@"C:\tmp\txe20037.dgn");
        PdfOptions po = new PdfOptions(); KILLS MY APP IF i USE po in place of the options below.
        po.Grayscale = true;

        PdfConvertOptions options = new PdfConvertOptions
        {
            PageNumber = 2,
            PagesCount = 1,
            //Rotate = Rotation.On90,
            PdfOptions (not allowed in this class) 
            Dpi = 300,
            Width = 1024,
            Height = 768
        };

            converter.Convert(@"c:\tmp\converted.pdf", options);
       
    }
}

}

1 Like
#11

@jochanan1234

Please have a look at the following code:

PdfConvertOptions options = new PdfConvertOptions
{ 
	Height = 768,
	PdfOptions =
	{
		Grayscale = true
	}
};

Then you can pass options to the Convert method. Please note that setting Grayscale to True will excess CPU load and the resultant PDF could in in large size.

#12

So many troubles!
I’ve implemented the PdfOptions class into the PdfConvertOptions…
Last line of debugger:
Exception thrown: ‘System.Reflection.AmbiguousMatchException’ in System.Private.CoreLib.dll

#13

@jochanan1234

Can you please share a sample application using that issue could be reproduced? Do you face the same issue with API NuGet package?

#14

Yes NuGet has been installed. If I don’t use the PdfOptions={Grayscale=true} option it will work with all the other “PdfConvertOptions” options.
link to zip file https://bartonmalow.box.com/s/uy39i2kmba243dxk6k4r1o575fs151zg

#15

@jochanan1234

This issue is reproduced at our end. Hence, we’ve logged it in our internal issue tracking system with ID CONVERSIONNET-4548. You’ll be notified in case of any update.