ASP.NET Core app on Ubuntu on Raspberry PI

Question

I've installed Ubuntu Core 16.04 on a Raspberry PI 3 and managed to get a .NET Core console app running on it by using the instructions here and using .NET Core version 1.2.0-beta-001291-00 which is compatible with ARM chips.

When I do the same with a basic ASP.NET Core app I get the following error :

Unhandled Exception: System.IO.FileLoadException: Could not load file or assembly 'System.Component.Primitives, Version=4.2.0.0, Cultire=Neutral, PublicKeyToken=b03f5f7f11d50a3a'. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) at Microsoft.Extensions.FileProviders.PhysicalFileError.CreateFileWatcher(String root) at Microsoft.AspNetCore.Hosting.Internal.HostingEnvironmentExtensions.Initialize>(IHostingEnvironment hostingEnvironment, String appplicationName, String contentRootPath, WebHostOptions options) at Microsoft.AspNetCore.Hosting.WebHostBuilder.BuildHostingServices() at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build() at Program.Main(String[] args) in /home/freek/aspnetcore/program.cs: line 12 Aborted

Here is the contents of program.cs :

using System;
using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;

public class Program
{
  public static void Main(string[] args)
  {
    Console.WriteLine("Hello World API!");

    var builder = new ConfigurationBuilder()
      .SetBasePath(Directory.GetCurrentDirectory())
      .AddJsonFile("appsettings.json", optional: true)
      .Build();

    var host = new WebHostBuilder()
      .UseKestrel()
      .UseConfiguration(builder)
      .UseContentRoot(Directory.GetCurrentDirectory())
      .UseStartup<Startup>()
      .Build();

    host.Run();       
  }  
}

The code runs fine on a deskop with Ubuntu running .NET Core 1.1 but gives the error on a PI running .NET Core 1.2.0-beta-001291-00.

Woot · Accepted Answer · 2017-01-29 11:42:00Z

2

Microsoft has been matching their version numbers for all of their core projects. Most package developers are following suit. So .net core version 1.1.0 most packages that are compatible with that version are also version 1.1.0

You need to update your project dependencies to their beta versions also. If you look at your project.json and go through all the dependencies look them up on nuget.org and get their latest beta version (1.2.0-beta-something) and update the project.json version number to the one you find on nuget.org it may work. It is beta after all.

My recommendation would be to installed .net core 1.1.0 on the Raspberry Pi and then it should work fine. However if you can't do that the above should work.

answered Jan 29, 2017 at 11:42

Woot

1,8091 gold badge18 silver badges23 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Freek Nortier Over a year ago

.net core 1.2.0-beta-001291-00 is currently the only one that is compatible with arm chips. The project dependencies do not have similar versions so it is impossible at the moment. When the next version of .net core is officially released I will revisit this. I managed to get a TCP server going that does not have dependencies. Thanks for your input.

Carlos Mendible Over a year ago

Now with .net core 2.0 and corresponding sdk you can publish for arm without issues: dotnet publish -c Release -r linux-arm.

Malte R · Accepted Answer · 2020-06-07 17:10:04Z

0

It is important to publish the solution with the correct Runtime Identifier (RID).

For Raspberry Pi, you should use linux-arm or linux-arm64.

Though dotnet is compatible with most popular platforms, the applications still needs to be either built locally on the machine that should run it, or using the correct RID for the machine that should run.

You cannot just use the same files (.dlls and such) as the ones used on your desktop computer. By default, dotnet publish uses the architecture of the machine it runs on, which is fine in all other cases than when the application needs to run on a different architecture (or OS). Your Pi and your desktop computer uses different architectures.

answered Jun 7, 2020 at 17:10

Malte R

4885 silver badges17 bronze badges

Collectives™ on Stack Overflow

ASP.NET Core app on Ubuntu on Raspberry PI

2 Answers 2

2 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related