Azure 函数 V3 无法使用 EF 核心 5.0-rc1 加载文件或程序集 Microsoft.Extensions.DependencyInjection.Abstractions，版本 = 5.0.0.0

问题描述

案例

我们正在使用 .netcore 3.1 创建 azure function v3.使用 EF core 5.0-rc1 和 依赖注入

1) 依赖注入

[程序集:FunctionsStartup(typeof(xxxxx.Startup))]命名空间 xxxxx{公共类启动:FunctionsStartup{公共覆盖无效配置(IFunctionsHostBuilder 构建器){var services = builder.Services;var configBuilder = 新的 ConfigurationBuilder().SetBasePath(Environment.CurrentDirectory).AddJsonFile("local.settings.json", true, reloadOnChange: true).AddEnvironmentVariables() ;配置服务(服务)；ConfigureAppSettings(services, configBuilder.Build());配置记录(服务，configBuilder.Build())；}}}

2) EF 核心 5.0 rc-1

虽然 Entity Framework Core 5.0 RC1 不能在 .Net 标准 2.0 平台上运行，但它需要 .net 标准 2.1.所以它找不到 Microsoft.Azure.Functions.Extensions.

更多细节可以参考这个文章.

Case

We are creating azure function v3 with .netcore 3.1. Using EF core 5.0-rc1 and Depdency Injection

1) DependecyInjection

[assembly: FunctionsStartup(typeof(xxxxx.Startup))]
namespace xxxxx
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            var services = builder.Services;
            var configBuilder = new ConfigurationBuilder()
                .SetBasePath(Environment.CurrentDirectory)
                .AddJsonFile("local.settings.json", true, reloadOnChange: true)
                .AddEnvironmentVariables() ;
            ConfigureServices(services);
            ConfigureAppSettings(services, configBuilder.Build());
            ConfigureLogging(services, configBuilder.Build());
        }
    }
}

2) EF core 5.0 rc-1

https://devblogs.microsoft.com/dotnet/announcing-entity-framework-core-efcore-5-0-rc1/

Error

Could not load file or assembly 'Microsoft.Extensions.DependencyInjection.Abstractions, Version=5.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. The system cannot find the file specified.

Packages

Following are the packages referenced

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <AzureFunctionsVersion>v3</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.ServiceBus" Version="4.1.0" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="5.0.0-rc.1.20451.14" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.7" />
    <PackageReference Include="Serilog.Extensions.Logging" Version="3.0.1" />
    <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
</Project>

Troubleshooting

commenting the following line in startup.cs (Dependency injection) solves the problem

[assembly: FunctionsStartup(typeof(xxxxx.Startup))]

解决方案

The Microsoft.Azure.Functions.Extensions depends on .net standard 2.0.

While the Entity Framework Core 5.0 RC1 will not run on .Net standard 2.0 platforms, it requires .net standard 2.1. So it could not find the Microsoft.Azure.Functions.Extensions.

For more details, you could refer to this article.

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