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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