在.Net Core Worker Service中托管Web API-无法引用IWebHostEnvironment [英] Hosting Web API in .Net Core Worker Service - cannot reference IWebHostEnvironment

问题描述

我正在创建.NET Core Worker服务，并希望公开该服务的ASP.Net Core Web API.我正在使用.NET Core 3.0.最初，我的计划是将IHostBuilder替换为IWebHostBuilder，并像常规的Asp.Net Core Web应用程序一样添加Startup类(不过，这可能过于简化了).

I'm creating a .NET Core Worker Service, and want to expose ASP.Net Core Web APIs for the service. I'm using .NET Core 3.0. Initially, my plan was to replace IHostBuilder with IWebHostBuilder and add a Startup class just like a regular Asp.Net Core web app (this is probably an oversimplification, though).

我的计划是简单地尝试替换

My plan was to simply try to replace

public static IHostBuilder CreateHostBuilder(string[] args)
        {
            return Host.CreateDefaultBuilder(args)                
                .ConfigureServices((hostContext, services) =>
                {
                    services.AddHostedService<Worker>();
                });
        }

使用

public static IWebHostBuilder CreateHostBuilder(string[] args)
        {
            return WebHost.CreateDefaultBuilder(args)
                .ConfigureServices(services =>
                {
                    services.AddHostedService<Worker>();
                }).UseStartup<Startup>();            
        }

这可能根本不起作用，但至少这是一个起点...使我无法尝试这种方法的原因是，由于 IWebHostEnvironment 不可用，所以无法实现我的 Startup 类.

which may not work at all, but at least it's a starting point... What's blocking me from trying this approach is that I cannot implement my Startup class because IWebHostEnvironment is unavailable.

这是我的

<PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <UserSecretsId>dotnet-WorkerServices-0E977A2C-F0C8-49E7-B00A-5EB01B99FBEB</UserSecretsId>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.Hosting.Server.Abstractions" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Hosting" Version="3.0.0" />
    <PackageReference Include="Microsoft.Extensions.Hosting.Abstractions" Version="3.0.0" />
  </ItemGroup>

据我所知， IWebHostEnvironment 应该位于 Microsoft.Extensions.Hosting.Abstractions nuget包中，但引用它似乎不起作用.

As far as I know, IWebHostEnvironment should be in the Microsoft.Extensions.Hosting.Abstractions nuget package, but referencing it does not seem to work.

有人有什么想法吗?-谢谢！

Does anyone have any ideas? -Thanks!

推荐答案

向API项目添加服务要容易得多.那只是一条额外的线.

It is much easier to add a service to an API project. That's just one extra line.

如果您不能或不想重新开始，请手动更改项目.忘了 IWebHostBuilder ，它现在已过时或过时了.

If you can't or don't want to start over, change your project manually. Forget about IWebHostBuilder, it is now obsolete or deprecated or something.

我可以在这里发布一些片段，但要容易得多:创建一个临时API项目，复制Program和Startup类(但保留您的名称空间)，然后在Startup内部:

I could post some fragments here but much easier: create a temporary API project, copy over the Program and Startup classes (but keep your namespaces) and then, inside Startup:

public void ConfigureServices(IServiceCollection services)
{
    services.AddHostedService<Worker>();  // the worker will run
    services.AddControllers();
}

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