當用戶向應用程式發出請求時，服務器將決議該請求，生成回應，然后將結果發送給客戶端，用戶可能會在服務器處理請求的時候中止請求，就比如說用戶跳轉到另一個頁面中獲取說關閉頁面，在這種情況下，我們希望停止所有正在進行的作業，以浪費不必要的資源，例如我們可能要取消SQL請求、http呼叫請求、CPU密集型操作等，
ASP.NET Core提供了HTTPContext.RequestAborted檢測客戶端何時斷開連接的屬性，我們可以通過IsCancellationRequested以了解客戶端是否中止連接，
[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>();
}
}
當然我們可以通過如下代碼片段以引數形式傳遞
[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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標籤：.NET Core