将命令行参数传递给ASP Core中的Startup类 [英] Pass command-line arguments to Startup class in ASP Core

问题描述

我有通过命令行传递的参数

I have arguments passed in via the command-line

private static int Main(string[] args)
{

    const string PORT = "12345"    ;

    var listeningUrl = $"http://localhost:{PORT}";

    var builder = new WebHostBuilder()
        .UseStartup<Startup>()
        .UseKestrel()
        .UseUrls(listeningUrl);

    var host = builder.Build();
    WriteLine($"Running on {PORT}");
    host.Run();

    return 0;
}

这些参数之一是日志记录输出目录.如何在我的Startup类中获取此值，以便在收到请求时可以写出该目录?

One of these arguments is a logging output directory. How do I get this value into my Startup class so I can write out to this directory when I receive a request?

我想避免使用静态类.提供价值的服务是否正确?如果是这样，我如何将服务注入到我的中间件中?

I'd like to avoid using a static class. Would a service that supplies the value be the right way? If so, how do I get services injected into my middleware?

推荐答案

您应该可以使用AddCommandLine()扩展名.首先安装Nuget软件包Microsoft.Extensions.Configuration.CommandLine并确保导入正确:

You should be able to use the AddCommandLine() extension. First install the Nuget package Microsoft.Extensions.Configuration.CommandLine and ensure you have the correct import:

using Microsoft.Extensions.Configuration;

现在更新您的Main方法以包括新的配置:

Now update your Main method to include the new config:

var config = new ConfigurationBuilder()
    .AddJsonFile("hosting.json", optional: true) //this is not needed, but could be useful
    .AddCommandLine(args)
    .Build();

var builder = new WebHostBuilder()
    .UseConfiguration(config)  //<-- Add this
    .UseStartup<Startup>()
    .UseKestrel()
    .UseUrls(listeningUrl);

现在，您将命令行选项视为配置:

Now you treat the command line options as configuration:

dotnet run /MySetting:SomeValue=123

并阅读代码:

var someValue = Configuration.GetValue<int>("MySetting:SomeValue");

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