WebJobsStartup in Azure Functions v2 not working when targeting netcoreapp2.1

user_2972 0
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I have an Azure Function v2 app, that I originally targeted netcoreapp2.1.

I then have a Startup.cs class, annotated with [assembly: WebJobsStartup(typeof(Startup))] to set up dependency injection, but it did not register Startup in the extensions.json file.

This is happening during build. Publish has another issue at the moment.

When I change the TargetFramework in the project file to netstandard2.0 it successfully adds Startup to extensions.json:

{
  "extensions":[
    { "name": "AzureStorage", "typeName":"Microsoft.Azure.WebJobs.Extensions.Storage.AzureStorageWebJobsStartup, Microsoft.Azure.WebJobs.Extensions.Storage, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"},
    { "name": "Startup", "typeName":"MyApp.Functions.Startup, MyApp.Functions, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"}
  ]
}

While I do not have exact reasons to target netcoreapp2.1, I am curious to figure out why it doesn't work, as v2 was changed to target .Net Core by default.

azure-functions .net-core azure
3 Answers

I have upgraded the Microsoft.NET.SDK.Functions to version 1.0.26 from manage nuget packages and it worked.

enter image description here

user_23620010

This looks fixed now just upgrade Microsoft.NET.SDK.Functions to version 1.0.25 +

user_13486110

In my case, I had simply missed to explicitly set host.json to be copied. Adding these rows to the csproj file did the works:

  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>
user_13766910
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