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();

}

}