How do you show animated GIFs on a Windows Form (c#)

问题

I have a form showing progress messages as a fairly long process runs. It\'s a call to a web service so I can\'t really show a percentage complete figure on a progress bar meaningfully. (I don\'t particularly like the Marquee property of the progress bar)

I would like to show an animated GIF to give the process the feel of some activity (e.g. files flying from one computer to another like Windows copy process).

How do you do this?

回答1:

It's not too hard.

Drop a picturebox onto your form.
Add the .gif file as the image in the picturebox
Show the picturebox when you are loading.

Things to take into consideration:

Disabling the picturebox will prevent the gif from being animated.

Animated gifs:

If you are looking for animated gifs you can generate them here

Another way of doing it:

Another way that I have found that works quite well is the async dialog control that I found on the code project

回答2:

I had the same problem. Whole form (including gif) stopping to redraw itself because of long operation working in the background. Here is how i solved this.

  private void MyThreadRoutine()
  {
   this.Invoke(this.ShowProgressGifDelegate);
   //your long running process
   System.Threading.Thread.Sleep(5000);
   this.Invoke(this.HideProgressGifDelegate);
  }

  private void button1_Click(object sender, EventArgs e)
  {
   ThreadStart myThreadStart = new ThreadStart(MyThreadRoutine);
   Thread myThread = new Thread(myThreadStart);
   myThread.Start(); 
  }

I simply created another thread to be responsible for this operation. Thanks to this initial form continues redrawing without problems (including my gif working). ShowProgressGifDelegate and HideProgressGifDelegate are delegates in form that set visible property of pictureBox with gif to true/false.

回答3:

Note that in Windows, you traditionally don't use animated Gifs, but little AVI animations: there is a Windows native control just to display them. There are even tools to convert animated Gifs to AVI (and vice-versa).

回答4:

If you put it in a PictureBox control, it should just work

回答5:

It doesn't when you start a long operation behind, because everything STOPS since you'Re in the same thread.

回答6:

I had the same issue and came across different solutions by implementing which I used to face several different issues. Finally, below is what I put some pieces from different posts together which worked for me as expected.

private void btnCompare_Click(object sender, EventArgs e)
{
    ThreadStart threadStart = new ThreadStart(Execution);
    Thread thread = new Thread(threadStart);
    thread.SetApartmentState(ApartmentState.STA);
    thread.Start();
}

Here is the Execution method that also carries invoking the PictureBox control:

private void Execution()
{
    btnCompare.Invoke((MethodInvoker)delegate { pictureBox1.Visible = true; });
    Application.DoEvents();

    // Your main code comes here . . .

    btnCompare.Invoke((MethodInvoker)delegate { pictureBox1.Visible = false; });
}

Keep in mind, the PictureBox is invisible from Properties Window or do below:

private void ComparerForm_Load(object sender, EventArgs e)
{
    pictureBox1.Visible = false;
}

来源：https://stackoverflow.com/questions/165735/how-do-you-show-animated-gifs-on-a-windows-form-c

标签

winforms

animated-gif