Dotnet console Application on arm32: Missing Name.dll

[mechaproject]

Hello there,

I have a problem and I can’t get any further. I have an Edge Box with Docker installed. Now I want to run a C# application on this Edge Box. The Edge Box itself does not have an Internet connection, which is why I create the Docker image locally on the PC (AMD architecture) and then save it as a .tar file and then import it to the Edge Box via Portainer. However, when I run this image on the Edge Box, I get the error message:

"Unhandled exception. System.IO.FileNotFoundException: Could not load file or assembly '/Name.dll'. The System cannot find the file specified.

As already mentioned, the PC has an AMD architecture, the Edge Box an arm32 architecture. So I create the image like this:

docker build --platform=linux/arm/v7 -t imagename .

I´ve tried it as a dotnet and as a dotnet Core application.

I wrote the Dockerfile as follows:

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build-env

COPY bin/Release/net6.0/publish .

EXPOSE 80

ENTRYPOINT ["dotnet", "Name.dll"]

I´ve tried many Base Images there. For example: mcr.microsoft.com/dotnet/runtime:6.0

Is it even possible to run a C# (.net / .net Core) application on an arm32 architecture?

I used many hours for this problem and I have no more idea how to solve it. Any ideas?

Thank You!

[rimelek (Ákos Takács)]

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@mechaproject

Is it even possible to run a C# (.net / .net Core) application on an arm32 architecture?

Since this is a “file not found” error, it has nothing to do with the architecture probably. If running dotnet apps on ARM were impossible, you could not pull a compatible image. It is possible however that Name.dll is not available for ARM. I would be surprised, but it is possible.

Have you tried to run the container on AMD architecture? If the DLL is missing on AMD too, I can’t tell you which base image contains it or how you can download one for ARM.

[mechaproject]

Hello,

Yes, I tried it on AMD architecture and it works.
So I can Run the container on the PC I built the Image.
But it’s not working on the Edge Box with Arm32 architecture.

Any Ideas?

Thanks!

[rimelek (Ákos Takács)]

@mechaproject

Any Ideas?

Not really. You need someone who works with dotnet containers on ARM. If you can build it and run it on AMD without platform option, then I guess Name.dll is not available for ARM or if it is, you need to download it from somewhere and install it during the build.

Normally I would say that you should ask the maintainer of the image. In this case the maintainer is Microsoft. Maybe you could try it on a Microsoft forum.

Update:

I also noticed that you mentioned arm32, not arm64. Is your PC AMD64 or AMD32? If you have AMD64, then maybe the problem is thatit is not available for a 32 bit CPU.

P.S.: I changed the title to fix a typo and addthe name of the DLL so it will be less general.