save the file in 1 min interval if some changes happened in wpf c#

Question

I have a xml file which i have to load in richtextbox in wpf. if some changes occure in txt file then it will save in different path automatically after a time interval of 1 min. Let the 1st changes happens in 10:11 then all the changes made up to 10:12 will save.File creation time will be 10:12 then again the richtextbox will be modified at 10:50 then the file modified time will be 10:51.The loading and the saving path is different.

  private void startSaveTimer()
    {
        Timer saveTimer = new Timer(60000);
        saveTimer.Elapsed += saveTimer_Elapsed;
        saveTimer.Start();
    }

    private void saveTimer_Elapsed(object sender, ElapsedEventArgs e)
    {
        string filepath = @"C:\mydoc.txt";//file save path
        if (File.Exists(filepath))
        {
            FileStream file = new FileStream(filepath, FileMode.Open);
            //geting the content  from file and compare with richtextbox data
            //if not same then saving it again
        }
       else
       {
        //save file
       }
    }

    private void richText_TextChanged(object sender, TextChangedEventArgs e)
    {
        startSaveTimer();
    }

but this code calledin each single changed so
FileStream file = new FileStream(filepath, FileMode.Open); is showing error as used by different user. try to keep lock still got the same error.

score 0 · Answer 1 · edited May 23 '17 at 12:05

See the following:

WPF Timer Like C# Timer

This gives you an event to fire your saves. I think you are also saying you only want to save when a change has occurred. So, you'll want to set some sort of dirty flag when the user makes a change so the timer event can check it, save, and reset it.

UPDATE: I think I understand your requirements better now. Since you just want a delayed save (not saving every minute), you could just do something like this:

private bool _isSaving = false;

private void richText_TextChanged(object sender, TextChangedEventArgs e)
{            
    delayedSaveAsync();
}

private async void delayedSaveAsync()
{
    // if already waiting, get out
    if (_isSaving) return;

    _isSaving = true;
    await Task.Delay(60000);

    // save

    _isSaving = false;
}

You need to keep track if you are already saving, or every keystroke is going to spawn another saving thread.

Instead of comparing file content (which could be heavy, or large files). You could just have a module level variable to track if the textbox is dirty or not - bool _textIsDirty = false; Then, you set it to true in the TextChanged event. After saving, you would set it back to false. — snow_FFFFFF, Jun 15 '15 at 13:32

save the file in 1 min interval if some changes happened in wpf c#

1 Answers1