Updates from February, 2010 Toggle Comment Threads | Keyboard Shortcuts

  • Ali BaderEddin 2:48 am on February 24, 2010 Permalink | Reply
    Tags: AbsoluteUri, GetResponseUri, , SPUrlZone, SPWebApplication, Url   

    SPWebApplication Url 


    I was trying to get the url of a SharePoint web application, but I couldn’t find a Url property for that class. Trying out several properties, I finally found an easy way to get the Url:

    string webUrl = webApp.GetResponseUri(SPUrlZone.Default).AbsoluteUri;

    where webApp is a reference to an object of type SPWebApplication. For example, here is a sample code that displays all web urls in the Farm (except for Central Admin WebApp).

    foreach (SPWebApplication webApp in SPWebService.ContentService.WebApplications)
    {
        string webUrl = webApp.GetResponseUri(SPUrlZone.Default).AbsoluteUri;
        Console.WriteLine(webUrl);
    }
     
  • Ali BaderEddin 4:50 am on February 11, 2010 Permalink | Reply  

    C# Windows Form is Busy 


    There are two very common ways of telling the user that your application is busy. One is to show a progress bar that gets updated based on the progress getting done, and another is to show the “Waiting” cursor while the application is doing work.

    Waiting Cursor

    To show the user the Waiting cursor while your program is busy, all you have to do is to set the current cursor to the Waiting cursor before your code runs, then set it back to an arrow after your code completes.

    Cursor.Current = Cursors.WaitCursor;
    
    //  Your Code
    
    Cursor.Current = Cursors.Default;

    Progress Bar

    The progress bar is a more user-friendly solution, but in most cases showing the waiting cursor does the job. Here is the simplest way to use a progress bar:

    int totalSteps = 10;
    for (int i = 1; i <= totalSteps; i++)
    {
        //  One chunk of your code
    
        int progress = i * 100 / totalSteps;
        blocksProgressBar.Value = progress;
    }
    blocksProgressBar.Value = 0;

    Yes, it’s that easy to implement a progress bar that gets updated based on the work done by your app. However, while progress is shown, the user can’t interact with the UI or do any other operation (the UI thread is the single thread doing the work here). To get the multi-threaded behavior, the easiest way is to use a background worker process, as shown below:

    So instead of putting your code in the event handler method, you will replace it with a call to start the worker process then move the code to the worker process events.

    private void doButton_Click(object sender, EventArgs e)
    {
        backgroundWorker.RunWorkerAsync();
    }

    The worker process will do its work in the DoWork event. To show progress, the code needs to be split into segments and the background worker ReportProgress method needs to be called whenever a segment of code is executed.

    private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e)
    {
        int totalSteps = 10;
    
        for (int i = 1; i <= totalSteps; i++)
        {
            //  One chunk of your code
    
            int progress = i * 100 / totalSteps;
            backgroundWorker.ReportProgress(progress);
        }
    }

    Whenever progress changes, we need to update the value of the progress bar.

    private void backgroundWorker_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        blocksProgressBar.Value = e.ProgressPercentage;
    }

    When the worker process is done (progress = 100%), we reset the progress bar.

    private void backgroundWorker_Completed(object sender, RunWorkerCompletedEventArgs e)
    {
        blocksProgressBar.Value = 0;
    }

    Below is a Windows Form application that lets you try the concepts explained above, and also shows you how the Marquee progress bar works, which is shockingly harder than the more realistic single-threaded progress bar we’ve discussed above.

    Download source and exe from here.

     
    • Paul 9:09 am on May 11, 2011 Permalink | Reply

      Thank You! That is exactly what I was looking for.

    • Mike 10:45 am on October 4, 2011 Permalink | Reply

      How do you tie a progress bar to sql query, returning data into a datagridview? It doesn’t have to be totally accurate, just doing something while the data is loading, then stopping once it has loaded…

    • Rudi Larno 8:49 am on December 8, 2011 Permalink | Reply

      Seems like the Marquee style does its work using the UI thread. So then it is logical that your options using System.Threading.Thread.Sleep(milliSecondsToWait); do not work, as you are blocking the UI Thread, not allowing your UI to get updated.

      Nice write up however.

    • yogesh makwana 8:58 pm on January 18, 2012 Permalink | Reply

      i want to know how to use marque in c#.net windowform…??????

    • Ankit Baria 5:31 am on September 14, 2012 Permalink | Reply

      Really helpful post. Thanks

    • http://tinyurl.com/guileasy48296 3:31 am on January 9, 2013 Permalink | Reply

      “C# Windows Form is Busy The Code Log” was
      in fact a truly awesome post, . Keep publishing and I’ll try to continue to keep reading through! Thanks for your time ,Louie

    • Khursheed Fateh 10:17 pm on May 12, 2014 Permalink | Reply

      See the modifivations I made to ylour program. Now Timer base progressbar is working.


      private Stopwatch s = new Stopwatch(); // Stopwatch
      private void progressButton2_Click(object sender, EventArgs e)
      {
      showProgress = true;
      timer.Enabled = true;
      timer.Start();

      s.Start(); // start stopwatch in this method

      marqueeProgressBar.Style = ProgressBarStyle.Marquee; // set progressbar style in this method
      }

      private void timer_Tick(object sender, EventArgs e)
      {
      if ( s.Elapsed < TimeSpan.FromSeconds((double)secondsToWaitSpinner2.Value))
      {
      // as long as elapsed time is less then the delay time
      // keep going
      toolStripStatusLabel1.Text = s.Elapsed.ToString(); // show elapsed time
      }
      else
      {
      marqueeProgressBar.Style = ProgressBarStyle.Blocks;
      timer.Stop();
      s.Stop(); // stop stop-watch here
      s.Reset(); // reset stop watch so that when you click again
      // it starts from begining and
      // not from where it stoped last time
      timer.Enabled = false;
      toolStripStatusLabel1.Text = "";
      }
      }

    • Khursheed Fateh 10:32 pm on May 12, 2014 Permalink | Reply

      “Before and after” part of your code is not working because it is freezing/stoping UI/Form for specified time. Because for the duration marquee is set Form remain froozen/unresponsive progressbar fails to show. You can see this by commenting last statement of method like this. Now you will see progressbar marquee was started but was unable to update itself because form was not responding during that time.

      private void progressButton_Click(object sender, EventArgs e)
      {
      marqueeProgressBar.Style = ProgressBarStyle.Marquee;

      int milliSecondsToWait = (int)secondsToWaitSpinner.Value * 1000;
      System.Threading.Thread.Sleep(milliSecondsToWait);

      // marqueeProgressBar.Style = ProgressBarStyle.Blocks;
      }

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