.NET Azure Functions - 依赖注入问题

Question

在我的 Azure Function v2 项目中的 Startup.cs 上：

using Microsoft.Azure.Functions.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using MyCompany.MyLib.Contracts; //namespace from external library

[assembly: FunctionsStartup(typeof(Startup))]
namespace Test
{
    public class Startup : FunctionsStartup
    {
       public override void Configure(IFunctionsHostBuilder builder)
      {            
        builder.Services.AddTransient(typeof(Logging.ILogger<>), typeof(Logging.Logger<>));
        builder.Services.AddTransient<IUserLogic, UserLogic>();
        builder.Services.AddTransient<IBillingLogic, BillingLogic>(); //---> loads up from above referenced "MyCompany.MyLib.Contracts" namespace and this namespace is from externally referenced class library but with in same solution
    }
}

}

上面的代码带有我自己在函数应用项目中的自定义类，比如“EmailLogic”、“Logger”工作正常。

但是，当我将自定义类添加到服务容器中时，例如“BillingLogic”来自外部 C# 库项目，它是作为参考项目从现有的 Visual Studio 解决方案添加的，它引发了以下问题：

“在启动操作 '945918c0-af3a-4d50-ab1d-ac405d4f1c7b' 期间发生主机错误。[2/3/2020 2:11:02 PM] MyFunction.FunctionApp：无法加载文件或程序集'MyCompany.MyLib.Contracts，Version=1.0.0.0，Culture=neutral，PublicKeyToken=null'。找不到或加载特定文件。（HRESULT 异常：0x80131621）。System.Private。 CoreLib：无法加载文件或程序集“MyCompany.MyLib.Contracts，Version=1.0.0.0，Culture=neutral，PublicKeyToken=null”

如果“引用的外部项目”中的这些行被删除，

using MyCompany.MyLib.Contracts;
builder.Services.AddTransient<IBillingLogic, BillingLogic>();

startup.cs 按预期工作，但我的解决方案必须从引用的项目中引用这个外部类。

我的 Azure 函数 csproj 文件：

     <Project Sdk="Microsoft.NET.Sdk">
      <PropertyGroup>
        <TargetFramework>netstandard2.0</TargetFramework>
        <AzureFunctionsVersion>v2</AzureFunctionsVersion>
        <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
        <AutoGenerateBindingRedirects>false</AutoGenerateBindingRedirects>
      </PropertyGroup>
      <ItemGroup>
        <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.0.0" />
        <PackageReference Include="Microsoft.Azure.Storage.Queue" Version="11.1.2" />
        <PackageReference Include="Microsoft.Azure.WebJobs.Extensions.Storage" Version="3.0.8" />
        <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="2.2.0" />
        <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.29" />
        <PackageReference Include="NLog" Version="4.6.8" />
        <PackageReference Include="Newtonsoft.Json" Version="12.0.3" />
        <PackageReference Include="NLog.Extensions.AzureStorage" Version="1.1.4" />
        <PackageReference Include="Microsoft.Azure.DocumentDB.Core" Version="2.9.2" />

      </ItemGroup>
      <ItemGroup>
        <ProjectReference Include="..\MyCSharpLib.DataStore\MyCSharpLib.DataStore.csproj">
          <Private>true</Private>
        </ProjectReference>
      </ItemGroup>
      <ItemGroup>
        <None Update="appsettings.json">
          <CopyToOutputDirectory>Always</CopyToOutputDirectory>
          <CopyToPublishDirectory>Always</CopyToPublishDirectory>
        </None>
        <None Update="host.json">
          <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
        </None>
        <None Update="local.settings.json">
          <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
          <CopyToPublishDirectory>Never</CopyToPublishDirectory>
        </None>
        <None Update="nlog.config">
          <CopyToOutputDirectory>Always</CopyToOutputDirectory>
          <CopyToPublishDirectory>Always</CopyToPublishDirectory>
        </None>
      </ItemGroup>
    </Project>

MyCSharpLib.DataStore.csproj 文件：

      <PropertyGroup>
        <TargetFramework>netstandard2.0</TargetFramework>
        <RuntimeIdentifier>win7-x64</RuntimeIdentifier>
        <Platforms>x64</Platforms>
      </PropertyGroup>

      <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" />

      <ItemGroup>
        <PackageReference Include="Microsoft.Azure.Cosmos.Table" Version="1.0.6" />
        <PackageReference Include="Microsoft.Azure.DocumentDB.Core" Version="2.9.2" />
        <PackageReference Include="Microsoft.Azure.Storage.Blob" Version="11.1.1" />
        <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
        <PackageReference Include="Newtonsoft.Json.Bson" Version="1.0.1" />
        <PackageReference Include="Polly" Version="5.3.1" />
        <PackageReference Include="StackExchange.Redis" Version="1.2.6" />
      </ItemGroup>

      <ItemGroup>
        <ProjectReference Include="..\MyContractLib.Contracts\MyContractLib.Contracts.csproj" />          
      </ItemGroup>

    </Project>

Answer 1

MyCSharpLib.DataStore

.\MyContractLib.Contracts\MyContractLib.Contracts.csproj

我的 Azure 函数 csproj 文件：

<ProjectReference Include="..\MyCSharpLib.DataStore\MyCSharpLib.DataStore.csproj">

所以

using MyCompany.MyLib.Contracts;

通过对 DataStore 的引用，然后引用到 MyContractLib.Contracts

但它并没有把 dll 当作愚蠢的东西来处理，所以要么让 Azure 函数 csproj 引用 MyLib.Contracts 或者这样做 How to set dependencies when I use .NET Standard 2.0 DLL libraries with a .NET Framework console application?

在你所有的标准库上添加

<RestoreProjectStyle>PackageReference</RestoreProjectStyle>

你的两个标准库都这样

<PropertyGroup>
    <TargetFramework>netstandard2.0</TargetFramework>
    <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
</PropertyGroup>

如果这不起作用，我将删除