如果在ASP.NET Core中使用IApplicationLifetime.ApplicationStopping
但是没有被触发,可能是由于以下几个原因:
IApplicationLifetime
服务。在Startup.cs
文件中的ConfigureServices
方法中,确保已经注册了IApplicationLifetime
服务:services.AddSingleton();
ApplicationStopping
事件处理程序。在Startup.cs
文件中的Configure
方法中,确保已经添加了ApplicationStopping
事件处理程序:app.ApplicationStopping.Register(() =>
{
// 在应用程序停止时执行的代码
});
ApplicationStopping
事件的处理程序是同步执行的,如果其中包含了长时间运行的异步代码,可能会导致事件无法触发。为了解决这个问题,可以将异步代码移到独立的线程中执行,以确保ApplicationStopping
事件能够正常触发。下面是一个完整的示例,演示了如何正确使用IApplicationLifetime.ApplicationStopping
事件:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
namespace ApplicationStoppingExample
{
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddSingleton();
}
public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IApplicationLifetime appLifetime)
{
appLifetime.ApplicationStopping.Register(() =>
{
Console.WriteLine("ApplicationStopping event triggered.");
// 在应用程序停止时执行的代码
});
app.Run(async (context) =>
{
await context.Response.WriteAsync("Hello, World!");
});
}
}
public class ApplicationLifetime : IApplicationLifetime
{
private readonly IHostApplicationLifetime _hostApplicationLifetime;
public ApplicationLifetime(IHostApplicationLifetime hostApplicationLifetime)
{
_hostApplicationLifetime = hostApplicationLifetime;
}
public CancellationToken ApplicationStarted { get; } = CancellationToken.None;
public CancellationToken ApplicationStopping { get; } = CancellationToken.None;
public CancellationToken ApplicationStopped { get; } = CancellationToken.None;
public void StopApplication()
{
_hostApplicationLifetime.StopApplication();
}
}
public class Program
{
public static void Main(string[] args)
{
CreateHostBuilder(args).Build().Run();
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureWebHostDefaults(webBuilder =>
{
webBuilder.UseStartup();
});
}
}
通过以上步骤,您应该能够正确触发IApplicationLifetime.ApplicationStopping
事件并执行相应的代码。