如何在 ASP.net 核心中手动重启 BackgroundService

如何解决如何在 ASP.net 核心中手动重启 BackgroundService

我创建了 BackgroundService：

public class CustomService : BackgroundService
{
    protected override async Task ExecuteAsync(CancellationToken cancellationToken)
    {
        //...
    }
}

然后我添加到项目中：

public class Startup
{
    //...

    public void ConfigureServices(IServiceCollection services)
    {
        services.AddHostedService<CustomService>();

        //...
    }

    //...
}

如何从另一个类中找到 CustomService？
如何重新开始？

解决方法

为调用 StartAsync 创建一个接口：

public interface ICustomServiceStarter
{
    Task StartAsync(CancellationToken token = default);
}

public class CustomService : BackgroundService,ICustomServiceStarter
{
    //...
    Task ICustomServiceStarter.StartAsync(CancellationToken token = default) => base.StartAsync(token);
    //...
}

将接口注册为单例：

public class Startup
{
    //...
    public void ConfigureServices(IServiceCollection services)
    {
        //...
        services.AddSingleton<ICustomServiceStarter,CustomService>();
    }
    //...
}

并在需要时注入 ICustomServiceStarter：

public class MyServiceControllerr : Controller
{
    ICustomServiceStarter _starter;

    public MyServiceController(ICustomServiceStarter starter)
    {
        _starter = starter;
    }

    [HttpPost]
    public async Task<IActionResult> Start()
    {
        await _starter.StartAsync();

        return Ok();
    }
}