display an animation gif in WPF

问题:

I would like to display an animation gif such as loading... in my XAML as my procedure is progressing. I found out that this cannot be easily done in WPF as I loaded my Gif and it just shows the first frame. What are the best ways to display an animation in WPF.

回答1:

I had this issue, until I discovered that in WPF4, you can simulate your own keyframe image animations. First, split your animation into a series of images, title them something like "Image1.gif", "Image2,gif", and so on. Import those images into your solution resources. I'm assuming you put them in the default resource location for images.

You are going to use the Image control. Use the following XAML code. I've removed the non-essentials.

<Image Name="Image1">
   <Image.Triggers>
      <EventTrigger RoutedEvent="Image.Loaded"
         <EventTrigger.Actions>
            <BeginStoryboard>
               <Storyboard>
                   <ObjectAnimationUsingKeyFrames Duration="0:0:1" Storyboard.TargetProperty="Source" RepeatBehavior="Forever">
                      <DiscreteObjectKeyFrames KeyTime="0:0:0">
                         <DiscreteObjectKeyFrame.Value>
                            <BitmapImage UriSource="Images/Image1.gif"/>
                         </DiscreteObjectKeyFrame.Value>
                      </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:0.25">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image2.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:0.5">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image3.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:0.75">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image4.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                     <DiscreteObjectKeyFrames KeyTime="0:0:1">
                        <DiscreteObjectKeyFrame.Value>
                           <BitmapImage UriSource="Images/Image5.gif"/>
                        </DiscreteObjectKeyFrame.Value>
                     </DiscreteObjectKeyFrames>
                  </ObjectAnimationUsingKeyFrames>
               </Storyboard>
            </BeginStoryboard>
         </EventTrigger.Actions>
      </EventTrigger>
   </Image.Triggers>
</Image>

回答2:

You could embed a MediaElement

<MediaElement LoadedBehavior="Play" Source="path/to.file" />

or winforms PictureBox:

    <wfi:WindowsFormsHost>
        <winForms:PictureBox x:Name="pictureBoxLoading">
        </winForms:PictureBox>
    </wfi:WindowsFormsHost>

However, I'd recommend finding a way to do this in WPF. Have a look at StoryBoards and animations. Without knowing what you're trying to achieve or why you want to do this it's hard to advise further.

回答3:

Simply Right Click on .gif file and change two properties:

Build Action : Embedded Resource

Copy To Output Directory : Copy if Newer

Then

 <MediaElement x:Name="myGif" UnloadedBehavior="Manual" Source="giphy_s.gif" MediaEnded="MediaElement_MediaEnded"/>

and set Event For Continue Running

private void MediaElement_MediaEnded(object sender, RoutedEventArgs e)
        {
            myGif.Position = new TimeSpan(0, 0, 1);
            myGif.Play();
        }