第二十一节：Asp.NetCore中使用托管服务实现后台任务

 1 public class TestBackService1 : BackgroundService
 2     {
 3         protected async override Task ExecuteAsync(CancellationToken stoppingToken)
 4         {
 5            
 6             while (!stoppingToken.IsCancellationRequested)
 7             {
 8                 try
 9                 {
10                     StreamWriter sw = System.IO.File.AppendText("Log/test.txt");
11                     //追加文本               
12                     await sw.WriteLineAsync($"当前时间为:{DateTime.Now}");//自动换行
13                     sw.Close();
14 
15                     await Task.Delay(TimeSpan.FromSeconds(60));
16 
17                     //测试报错，进入catch停止后台任务
18                     //int.Parse("dsfs");
19 
20                 }
21                 catch (Exception ex)
22                 {
23                     StreamWriter sw = System.IO.File.AppendText("Log/test.txt");
24                     await sw.WriteLineAsync($"当前时间为:{DateTime.Now}，报错了：{ex.Message}");//自动换行
25                     sw.Close();
26 
27                     //根据实际业务情况，决定报错了是继续执行还是停止改后台任务
28                     //await base.StopAsync(stoppingToken);
29                 }
30             }
31         }
32     }

1       public void ConfigureServices(IServiceCollection services)
2         {
3             services.AddControllersWithViews();
4 
5             //注册后台托管服务
6             services.AddHostedService();
7         }