The type initializer for 'Syncfusion.PdfToImageConverter.PdfiumNative' threw an exception.

[Otto Moura Machado Filho]

Hi,

I'm using Syncfusion ASP.NET Core with Pdf Viewer component.

One of the problems that i have is that Pdf Viewer is not rendering on Linux container.

This is my configurations:

• dotnet 8

• <PackageReference Include="Syncfusion.EJ2.PdfViewer.AspNet.Core" Version="25.1.39" />

• Amazon Linux - Version 2023.4.20240528

• Dockerfile

  • FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env

    RUN ln -s /lib/x86_64-linux-gnu/libdl.so.2 /lib/x86_64-linux-gnu/libdl.so

    # install System.Drawing native dependencies

    RUN apt-get update && apt-get install -y --allow-unauthenticated libgdiplus libc6-dev libx11-dev

    RUN ln -s libgdiplus.so gdiplus.dll

    WORKDIR /app

    # Copy everything

    COPY . ./

    WORKDIR /app/src/Viewer

    # Restore, Build and Publish a release

    RUN dotnet publish -c Release -o out

    # Build runtime image

    FROM mcr.microsoft.com/dotnet/aspnet:8.0

    ENV DOTNET_EnableDiagnostics=0

    ENV ASPNETCORE_URLS http://*:5003

    ENV ASPNETCORE_ENVIRONMENT Production

    
    

Everything works well when deployed on Windows.

Can someone help me out with this?

[Chinnamunia Karthik Chinna Thambi]

Hi Otto,

The reported issue occurs when the PDFium dependency is missing in the environment. If you are using the PDF Viewer with Docker in the .NET 8.0 framework, please refer to the Dockerfile below for instructions on how to install the PDFium dependency:

 

• https://github.com/SyncfusionExamples/PdfViewer-Server/blob/master/Dockerfile_NET80

 

Kindly compare the above Dockerfile and modify your Dockerfile accordingly and let us know, if you are facing any issues.

[Otto Moura Machado Filho]

Hi Chinnamunia,

Thanks for your help.

Problem solved.

Analyzing your Dockerfile, I saw that the problem was the execution order of the runtime libraries, so I solved the problem by placing the part of the code that executes the libraries after building the runtime image, like this:

# First - Create runtime image

FROM mcr.microsoft.com/dotnet/aspnet:8.0

# Second

RUN ln -s /lib/x86_64-linux-gnu/libdl.so.2 /lib/x86_64-linux-gnu/libdl.so

# Install the native System.Drawing dependencies

RUN apt-get update && apt-get install -y --allow-unauthenticated libgdiplus libc6-dev libx11-dev libfontconfig

RUN ln -s libgdiplus.so gdiplus.dll

After that, I had a problem with SkiaSharp rendering the PDF. 

We solved this problem by adding a package “<PackageReference Include=”SkiaSharp.NativeAssets.Linux“ Version=”2.88.8“ />” in my project and adding this point “libfontconfig” in this line “RUN apt-get update && apt-get install -y --allow-unauthenticated libgdiplus libc6-dev libx11-dev libfontconfig”

My final Dockerfile:

FROM mcr.microsoft.com/dotnet/sdk:8.0 AS build-env

WORKDIR /app

# Copy everything

#COPY . ./

COPY ["src/Viewer/EClic.UI.Viewer", "./Viewer"]

WORKDIR /app/Viewer

# Restore, Build and Publish a release

RUN dotnet publish -c Release -o out

# Build runtime image

FROM mcr.microsoft.com/dotnet/aspnet:8.0

RUN ln -s /lib/x86_64-linux-gnu/libdl.so.2 /lib/x86_64-linux-gnu/libdl.so

# install System.Drawing native dependencies

RUN apt-get update && apt-get install -y --allow-unauthenticated libgdiplus libc6-dev libx11-dev libfontconfig

RUN ln -s libgdiplus.so gdiplus.dll

ENV DOTNET_EnableDiagnostics=0

ENV ASPNETCORE_URLS http://*:5003

ENV ASPNETCORE_ENVIRONMENT Production

WORKDIR /app

COPY --from=build-env /app/Viewer/out .

ENTRYPOINT ["dotnet", "EClic.UI.Viewer.dll"]

Thank you very much.

[Chinnamunia Karthik Chinna Thambi]

Hi Otto,

Thank you for your update. We are glad to know that your problem has been solved. 

 

Please let us know if you need any further assistance with this.