This can be achieved by getting the host's cancelation token and registering a callback with it like so
public class Startup
{
public void Configuration(IAppBuilder app)
{
var context = new OwinContext(app.Properties);
var token = context.Get<CancellationToken>("host.OnAppDisposing");
if (token != CancellationToken.None)
{
token.Register(() =>
{
// code to run
});
}
}
}
I was told by someone on the Katana team that this key is for host specific functionality and therefore may not exist on all hosts. Microsoft.Owin.Host.SystemWeb does implement this, but I'm not sure about the others.
The easiest way to verify if this will work for you is to check app.Properties
for the host.OnAppDisposing
key.