(.NET Core C#) Async Progress Info Log

Demonstrates checking for progress info updates when running a task asynchronously.

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// All Chilkat classes can be unlocked at once at the beginning of a program
// by calling UnlockBundle.  It requires a Bundle unlock code.
Chilkat.Global chilkatGlob = new Chilkat.Global();
bool success = chilkatGlob.UnlockBundle("Anything for 30-day trial.");
if (success != true) {
    Debug.WriteLine(chilkatGlob.LastErrorText);
    return;
}

// The mailman object is used for sending and receiving email.
Chilkat.MailMan mailman = new Chilkat.MailMan();

// Set the SMTP server and any required settings.
mailman.SmtpHost = "smtp.mymailserver.com";
mailman.SmtpUsername = "myLogin";
mailman.SmtpPassword = "myPassword";
mailman.StartTLS = true;

// Create a new email object
Chilkat.Email email = new Chilkat.Email();

email.Subject = "This is a test";
email.Body = "This is a test";
email.From = "Chilkat Support <support@chilkatsoft.com>";
success = email.AddTo("Chilkat Admin","admin@chilkatsoft.com");

// Call the async version of the SendEmail method to return a task object.
// The task object is loaded, but is in the Inert state -- meaning it is
// not yet scheduled to run on Chilkat's background thread pool.
Chilkat.Task task = mailman.SendEmailAsync(email);
if (mailman.LastMethodSuccess == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

// Before starting the task, tell it to keep an in-memory log of what would've been
// ProgressInfo event callbacks.
task.KeepProgressLog = true;

// Schedule the task for running on the thread pool.  This changes the task's state
// from Inert to Live.
success = task.Run();
if (success != true) {
    Debug.WriteLine(task.LastErrorText);

    return;
}

// The application is now free to do anything else
// while the email is being sent.

// For this example, we'll simply sleep and periodically
// check to see if the SendEmail if finished.  While checking
// however, we'll report on the progress.
int curPctDone = 0;
string name;
string value;

while (task.Finished != true) {

    if (task.PercentDone != curPctDone) {
        curPctDone = task.PercentDone;
        Debug.WriteLine(Convert.ToString(curPctDone) + " percent done");
    }

    // Check the progress info log.
    // Emit any log entries..
    while ((task.ProgressLogSize > 0)) {
        // Get the 1st entry, emit it, and then remove it..
        name = task.ProgressInfoName(0);
        value = task.ProgressInfoValue(0);
        Debug.WriteLine(name + ": " + value);
        task.RemoveProgressInfo(0);
    }

    // Sleep 100 ms.
    task.SleepMs(100);

}

// Just in case there are any remaining entries...
while ((task.ProgressLogSize > 0)) {
    // Get the 1st entry, emit it, and then remove it..
    name = task.ProgressInfoName(0);
    value = task.ProgressInfoValue(0);
    Debug.WriteLine(name + ": " + value);
    task.RemoveProgressInfo(0);
}

// A finished task could be one that was canceled, aborted, or truly finished.  

// If the task was "canceled", it was canceled prior to actually starting.  This could
// happen if the task was canceled while waiting in a thread pool queue to be scheduled by Chilkat's
// background thread pool scheduler.  

// If the task was "aborted", it indicates that it was canceled while running in a background thread.  
// The ResultErrorText will likely indicate that the task was aborted.

// If the task "completed", then it ran to completion, but the actual success/failure of the method
// is determined by the result obtained via a GetResult* method.  (A "completed" task will
// have a StatusInt equal to 7.   If the task finished, but was not completed, then it must've
// been aborted or canceled:
if (task.StatusInt != 7) {
    Debug.WriteLine("Task did not complete.");
    Debug.WriteLine("task status: " + task.Status);

    return;
}

// The SendEmail method returns a boolean.  Therefore, after the task is finished,
// we can get the boolean result by calling GetResultBool.  This is the return value had
// we called SendEmail synchronously.
success = task.GetResultBool();
if (success != true) {
    // The task's ResultErrorText contains what would have been in the LastErrorText property had
    // the SendEmail method been called synchronously.
    Debug.WriteLine(task.ResultErrorText);
}
else {
    Debug.WriteLine("Email sent asynchronously.");
}

success = mailman.CloseSmtpConnection();
if (success != true) {
    Debug.WriteLine("Connection to SMTP server not closed cleanly.");

}