2020-05-26

ASP.NET Core中处理中止的请求

ASP.NET Core中处理中止的请求


当用户向应用程序发出请求时,服务器将解析该请求,生成响应,然后将结果发送给客户端。用户可能会在服务器处理请求的时候中止请求。就比如说用户跳转到另一个页面中获取说关闭页面。在这种情况下,我们希望停止所有正在进行的工作,以浪费不必要的资源。例如我们可能要取消SQL请求、http调用请求、CPU密集型操作等。

ASP.NET Core提供了HTTPContext.RequestAborted检测客户端何时断开连接的属性,我们可以通过IsCancellationRequested以了解客户端是否中止连接。

[ApiController][Route("[controller]")]public class WeatherForecastController : ControllerBase{ [HttpGet] public async Task<WeatherForecast> Get() {  CancellationToken cancellationToken = HttpContext.RequestAborted;  if (cancellationToken.IsCancellationRequested)  {   //TODO aborted request  }  return await GetWeatherForecasts(cancellationToken); } private async Task<WeatherForecast> GetWeatherForecasts(CancellationToken cancellationToken) {  await Task.Delay(1000, cancellationToken);   return Array.Empty<WeatherForecast>(); }}

当然我们可以通过如下代码片段以参数形式传递

[ApiController][Route("[controller]")]public class WeatherForecastController : ControllerBase{ [HttpGet] public async Task<WeatherForecast> Get(CancellationToken cancellationToken) {  return await GetWeatherForecasts(cancellationToken); } private async Task<WeatherForecast> GetWeatherForecasts(CancellationToken cancellationToken) {  await Task.Delay(1000, cancellationToken);   return Array.Empty<WeatherForecast>(); }}

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