ASP.NET Core中的Startup.cs中kestrel关闭function

Question

Is there a shutdown function when using Microsoft.AspNet.Server.Kestrel ? ASP.NET Core (formerly ASP.NET vNext ) clearly has a Startup sequence, but no mention of shutdown sequence and how to handle clean closure.

Answer 1

In ASP.NET Core you can register to the cancellation tokens provided by IApplicationLifetime

public class Startup 
{
    public void Configure(IApplicationBuilder app, IApplicationLifetime applicationLifetime) 
    {
        applicationLifetime.ApplicationStopping.Register(OnShutdown);
    }

    private void OnShutdown()
    {
         // Do your cleanup here
    }
}

IApplicationLifetime is also exposing cancellation tokens for ApplicationStopped and ApplicationStarted as well as a StopApplication() method to stop the application.

For .NET Core 3.0+

From comments @Horkrine

For .NET Core 3.0+ it is recommended to use IHostApplicationLifetime instead, as IApplicationLifetime will be deprecated soon. The rest will still work as written above with the new service

Answer 2

In addition to the original answer, I had an error while trying to wire the IApplicationLifetime within the constructor.

I solved this by doing:

public class Startup 
{
    public void Configure(IApplicationBuilder app) 
    {
        var applicationLifetime = app.ApplicationServices.GetRequiredService<IApplicationLifetime>();
        applicationLifetime.ApplicationStopping.Register(OnShutdown);
    }

    private void OnShutdown()
    {
         // Do your cleanup here
    }
}

Answer 3

This class is now obsolete, please refer to the new interface IHostApplicationLifetime . More info here .

Answer 4

I solved it with the application lifetime callback events

Startup.cs

public void Configure(IHostApplicationLifetime appLifetime) {
 appLifetime.ApplicationStarted.Register(() => {
  Console.WriteLine("Press Ctrl+C to shut down.");
 });

 appLifetime.ApplicationStopped.Register(() => {
  Console.WriteLine("Terminating application...");
  System.Diagnostics.Process.GetCurrentProcess().Kill();
 });
}

---

Program.cs

Also, use UseConsoleLifetime() while building the host.

Host.CreateDefaultBuilder(args).UseConsoleLifetime(opts => opts.SuppressStatusMessages = true);

Answer 5

When using .NET 6 without a Startup class, you can access the ApplicationStopping CancellationToken via the built web application in Program.cs, eg

var app = builder.Build();
...
app.Lifetime.ApplicationStopping.Register(() => ...);
...
app.Run();

Answer 6

In.Net 6 if you are not using Startup.cs. You could use ApplicationStopping method in Program.cs

var builder = WebApplication.CreateBuilder(new WebApplicationOptions
{   
    Args = args,
    ContentRootPath = Directory.GetCurrentDirectory(),
    WebRootPath = "wwwroot"
});

var app = builder.Build();

app.Lifetime.ApplicationStopping.Register(() =>
{
 // Do Something
});

app.Run();