c# - WebHostBuilder。如何在 .NET-Core 2.0 中使用 CommandLine 设置 url 地址？

Question

我使用下面的代码在我的 .Net-Core 1.2 环境中添加 CommandLine，我可以使用像 dotnet run --urls "http://a.cn.com:5000"--environment 这样的命令行“生产”。

public static void Main(string[] args)
{
     var config = new ConfigurationBuilder()
                .AddJsonFile("hosting.json", optional: true)
                .AddCommandLine(args)
                .Build();

     var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseStartup<Startup>()
                .UseConfiguration(config)
                .Build();

     host.Run();
}

迁移到 .net core 2.0 后就变成这样了

public static void Main(string[] args)
{
    BuildWebHost(args).Run();
}

public static IWebHost BuildWebHost(string[] args)
{
    return WebHost.CreateDefaultBuilder(args)
                .ConfigureLogging((context, logging) =>
                {
                    logging.AddSerilog();
                })
                .UseStartup<Startup>()
                .Build();
 }

我使用相同的命令行，它失败了。.net core 2.0 如何添加命令？

供应:2017.08.17下面的 launchsetting.json :

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:5005/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "Robert.Project.Web": {
      "commandName": "Project",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://localhost:5006"
    }
  }
}

我期望的听力是正在收听http://a.cn.com:5000我得到的是:

并且我们不应该在 Program.cs 文件中添加任何其他代码，因为 CreateDefaultBuilder 包含 addCommandLine。更多详情，您可以查看WebHost.cs#L177

供应 2017 0817 17:44 UTC+8

[::] is the IPv6 equivalent of IPv4 0.0.0.0.

Answer 1

直接使用UseConfiguration设置args填充的url地址:

public static IWebHost BuildWebHost(string[] args)
{
        var config = new ConfigurationBuilder().AddCommandLine(args).Build();

        return WebHost.CreateDefaultBuilder(args)
            .UseConfiguration(config)
            .UseStartup<Startup>()
            .Build();
}

---

And we should not add any other code in Program.cs file, cause CreateDefaultBuilder is contain addCommandLine. for more detail, you can see WebHost.cs#L177

这不完全正确，因为链接的 CreateDefaultBuilder 实现使用 ConfigureAppConfiguration 方法，而不是 UseConfiguration。并且有区别(来自相关的 Github issue ):

The ConfigureAppConfiguration was intended to configure the IConfiguration in the application services whereas UseConfiguration is intended to configure the settings of the WebHostBuilder. Since the url address is a setting on the WebHostBuilder only UseConfiguration will work here.

Note that the WebHostBuilder's configuration is added to the application's configuration but the converse is not true; configuring the application's configuration does not affect the WebHostBuilder's configuration.