private void buttonPingGoogle_Click(object sender, EventArgs e)
{
// this is kind of an odd flow.
TimeCorrection timeCorrection = null;
// set up the asyn operation complete with continuation, catch and finally delegates
// the async operation will use the synchronization context to post the continuation,
// catch, and finally delegates to run on the UI thread. Since we are creating this object
// on the UI thread it will use the UI synchronization context.
AsyncOperation getTimeCorrectionOperation = new AsyncOperation(() => // on background threadpool thread
{
timeCorrection = Ntp.GetTimeCorrectionFromGoogle();
},
() => // continuation on UI thread
{
var offset = timeCorrection.CorrectionFactor;
var totalSeconds = Math.Abs(offset.TotalSeconds);
if (totalSeconds == 0)
{
MessageBox.Show("Your time is perfect according to Google's servers");
}
else if (totalSeconds <= 5)
{
MessageBox.Show("Your time is off by five seconds or less from Google's servers. You should be just fine.");
}
else if (totalSeconds <= 30)
{
MessageBox.Show(string.Format("Your time is off by {0} seconds from Google's servers. You are probably OK but correcting couldn't hurt.", totalSeconds));
}
else
{
MessageBox.Show(string.Format("Your time is off by {0} seconds from Google's servers. Try correcting the difference and try again.", totalSeconds));
}
},
ex => MessageBox.Show(ex.Message, "Error"), // catch on UI thread
() => // finally on UI thread
{
this.buttonPingGoogle.Visible = true;
this.progressBarGettingTimeCorrection.Visible = false;
});
this.buttonPingGoogle.Visible = false;
this.progressBarGettingTimeCorrection.Visible = true;
getTimeCorrectionOperation.Run();
}
