後端 API 針對前端發出的請求若已經跳出網頁時的中斷機制實作方式
[HttpPost("[action]")] public async Task<IActionResult> 查詢(查詢參數 參數, CancellationToken ct) { try { ct.ThrowIfCancellationRequested(); var a = await context1.table1.Select(...).ToListAsync(ct); await Parallel.ForEachAsync(訊息s, new ParallelOptions { MaxDegreeOfParallelism = 8, CancellationToken = ct }, async (x, token) => { token.ThrowIfCancellationRequested(); var a = await context1.table1.Select(...).ToListAsync(token); }); } catch (OperationCanceledException) { // 用戶端中止，結束不再寫回應 return new EmptyResult(); } }