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I have to send report via email everyday at a particular time.
In order to do that I used BackgroundService in Asp.Net Core MVC for preparing a report to be sent later via email.
The thing is that it sends two emails in same time even though i created it in a singleton pattern and it with 1 min delay.
I didn't encounter any problem when I debugged it with Visual Studio and it sent only once on localhost instead of azure.
As I mentioned above when it was run on Azure it sent the email twice.

While i prepare report i give its name like yyyyMMdd_HH_mm_ss so two emails name are Report_20201223_22_00_36 and Report_20201223_22_00_46.
So I feel like there are two thread instead of one thread.

The code what i wrote is below.

What I have tried:

public class SendReportWorker : BackgroundService
    private readonly SendReportWorkerSettings SendReportWorkerSettings;
	private readonly ILogger<SendReportWorker> logger;
    public SendReportWorker(ILogger<SendReportWorker> logger,
        SendReportWorkerSettings SendReportWorkerSettings)
        this.SendReportWorkerSettings = SendReportWorkerSettings;
		this.logger = logger;
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
        while (!stoppingToken.IsCancellationRequested)
                var now = DateTimeOffset.UtcNow;
				//SendReportWorkerSettings.ExecuteHourMinuteUtc = ["12:00"]
                if (Array.Exists(SendReportWorkerSettings.ExecuteHourMinuteUtc, q => q == now.ToString("HH':'mm")))

                        logger.LogInformation("SendReportWorker running at: {time}", DateTimeOffset.Now);
						// Preparing Report ...
						// Sending Report Via Email ...
            catch (Exception ex)
            await Task.Delay(TimeSpan.FromMinutes(1), stoppingToken);

 public void ConfigureServices(IServiceCollection services)
Updated 1-Apr-22 10:41am

1 solution

You have a "while" loop; and you send without breaking out.
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amagitech 25-Dec-20 1:07am    
In fact in loop i have await Task.Delay(TimeSpan.FromMinutes(1), stoppingToken);
I don't want to stop it after sending mail. Because it has to send email again 12:00 in next days. It's daily job so it must repeat everyday.

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