c# - Asp.Net 核心长时间运行/后台任务

Question

以下是在 Asp.Net Core 中实现长时间运行的后台工作的正确模式吗？或者我应该使用某种形式的 Task.Run/TaskFactory.StartNew 和 TaskCreationOptions.LongRunning 选项吗？

    public void Configure(IApplicationLifetime lifetime)
    {
        lifetime.ApplicationStarted.Register(() =>
        {
            // not awaiting the 'promise task' here
            var t = DoWorkAsync(lifetime.ApplicationStopping);

            lifetime.ApplicationStopped.Register(() =>
            {
                try
                {
                    // give extra time to complete before shutting down
                    t.Wait(TimeSpan.FromSeconds(10));
                }
                catch (Exception)
                {
                    // ignore
                }
            });
        });
    }

    async Task DoWorkAsync(CancellationToken token)
    {
        while (!token.IsCancellationRequested)
        {
            await // async method
        }
    }

Answer 1

同时检查 .NET Core 2.0 IHostedService。这是 documentation .从 .NET Core 2.1 开始，我们将拥有 BackgroundService 抽象类。可以这样使用:

public class UpdateBackgroundService: BackgroundService
{
    private readonly DbContext _context;

    public UpdateTranslatesBackgroundService(DbContext context)
    {
        this._context= context;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        await ...
    }
}

在您的初创公司中，您只需注册类(class):

public static IServiceProvider Build(IServiceCollection services)
{
    //.....
    services.AddSingleton<IHostedService, UpdateBackgroundService>();
    services.AddTransient<IHostedService, UpdateBackgroundService>();  //For run at startup and die.
    //.....
}