c# - 隐藏 ASP.NET Core WebHost 消息

Question

我有一个 ASP.NET Core 应用程序，我想在其中隐藏启动应用程序时显示的控制台行(因为我有自己的欢迎消息)

Hosting environment: Development
Content root path: path\to\my\executable
Now listening on: http://localhost:portnumber
Application started. Press Ctrl+C to shut down.

我尝试了一种解决方案，我将 Console.Out 设置为空流，然后在我想写东西时将其设置回去。它在我的开发 PC 上运行良好，但我发现该问题出现在其他 PC 上。

    Console.Write(WelcomeMessage);
    ConsOut = Console.Out;  //Save the reference to the old out value (The terminal)
        Console.SetOut(new StreamWriter(Stream.Null));  //Hack out the console
        var host = new WebHostBuilder()
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseUrls(url)
            .UseStartup<Startup>()
            .UseApplicationInsights()
            .Build();
        host.Run();

我对这个解决方案不满意，因为它看起来像是一个 hack，而且不能始终如一地工作。

来自 How to turn off the logging done by the ASP.NET core framework ，我发现您可以在 Startup.cs 类的 Configure() 方法中禁用自动日志记录系统，所以我相信这与我正在寻找的类似，我只是不知道如何删除托管消息。

编辑:我注意到我的问题与 Asp.Net Core API disable startup complete message 相同.但是对于想隐藏启动信息，又想自己写控制台信息的问题一直没有得到满意的答复。

Answer 1

我发现 this answer也可以解决我的问题。我的方法最终看起来像这样:

     Console.Write(WelcomeMessage);
        ConsOut = Console.Out;  //Save the reference to the old out value (The terminal)
        Console.SetOut(new StreamWriter(Stream.Null));  //Remove the console output
        var host = new WebHostBuilder()
            .UseKestrel()
            .UseContentRoot(Directory.GetCurrentDirectory())
            .UseIISIntegration()
            .UseUrls(url)
            .UseStartup<Startup>()
            .UseApplicationInsights()
            .Build();
        host.Start();   //Start the host in a non-blocking way
        Console.SetOut(ConsOut);    //Put the console output back, after the messages has been written
        Console.CancelKeyPress += OnConsoleCancelKeyPress;
        var waitHandles = new WaitHandle[] {
            CancelTokenSource.Token.WaitHandle
        };
        WaitHandle.WaitAll(waitHandles);    //Wait until the cancel signal has been received

OnConsoleCancelKeyPress 方法如下所示:

    /// <summary>
    /// This method is meant as an eventhandler to be called when the Console received a cancel signal.
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private static void OnConsoleCancelKeyPress(object sender, ConsoleCancelEventArgs e)
    {
        //Got Ctrl+C from console
        Console.WriteLine("Shutting down.");
        CancelTokenSource.Cancel();
    }

由于 Start() 是一个非阻塞调用，当 WebHost 启动时返回，我可以确保启动 WebHost 时输出的消息已经写入，它们不会再打扰我的用户(我在我一开始遇到错误的机器上进行了测试)。