Application_End equivalent in ASP.NET Core rc2? [duplicate] - asp.net-core-mvc

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

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 4

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

Answer 5

When using .NET 6 without a Startup class, you can access the ApplicationStopping CancellationToken via the built web application in Program.cs, e.g.
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();