efcore: Could not load System.Diagnostics.DiagnosticSource

Could not load file or assembly ‘System.Diagnostics.DiagnosticSource, Version=4.0.1.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51’.

I am seeing a ton of people hitting this when using netcoreapp1.1. (See #7869, #7557, #7742, #7358 & #5627) We thought dotnet/corefx#15031 was going to fix it, but there must be another underlying issue somewhere.

About this issue

Original URL
State: closed
Created 7 years ago
Comments: 32 (11 by maintainers)

Commits related to this issue

CLI Tools: Use project's runtime framework version Fixes aspnet/EntityFramework#7889 — committed to aspnet/EntityFramework.Tools by bricelam 7 years ago
CLI Tools: Use project's runtime framework version Fixes aspnet/EntityFramework#7889 — committed to aspnet/EntityFramework.Tools by bricelam 7 years ago

Most upvoted comments

Looks like this only occurs on Class Library projects targeting netcoreapp1.1. The issue is that we fallback to using ef.runtimeconfig.json which targets Microsoft.NETCore.App version 1.0.0.

Workaround

You can workaround the issue by forcing a runtime config to be generated by the project. This avoids falling back to running on 1.0. To do this, add the following to the project’s *.csproj

<PropertyGroup>
  <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
</PropertyGroup>

+42

bricelam on Mar 15, 2017

Note, a fix has been checked into dev and should be available soon on the nightly build feed.

bricelam on Mar 22, 2017