我制作了一个GIF动画用户控件，用于加载gif动画，并在我的项目中创建了大约30个动画，每个动画都有动画GIF。问题是当我检查我的CPU使用率大约是70％+ !!!我确定这有问题！ 请帮我。以下是GIF Animator控件的代码：
public class AnimatedImage : System.Windows.Controls.Image
{
private BitmapSource[] _BitmapSources = null;
private int _nCurrentFrame=0;
private bool _bIsAnimating=false;
public bool IsAnimating
{
get { return _bIsAnimating; }
}
static AnimatedImage()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(AnimatedImage), new FrameworkPropertyMetadata(typeof(AnimatedImage)));
}
public Bitmap AnimatedBitmap
{
get { return (Bitmap)GetValue(AnimatedBitmapProperty); }
set { StopAnimate(); SetValue(AnimatedBitmapProperty, value); }
}
/// <summary>
/// Identifies the Value dependency property.
/// </summary>
public static readonly DependencyProperty AnimatedBitmapProperty =
DependencyProperty.Register(
"AnimatedBitmap", typeof(Bitmap), typeof(AnimatedImage),
new FrameworkPropertyMetadata(null, new PropertyChangedCallback(OnAnimatedBitmapChanged)));
private static void OnAnimatedBitmapChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args)
{
AnimatedImage control = (AnimatedImage)obj;
control.UpdateAnimatedBitmap();
RoutedPropertyChangedEventArgs<Bitmap> e = new RoutedPropertyChangedEventArgs<Bitmap>(
(Bitmap)args.OldValue, (Bitmap)args.NewValue, AnimatedBitmapChangedEvent);
control.OnAnimatedBitmapChanged(e);
}
/// <summary>
/// Identifies the ValueChanged routed event.
/// </summary>
public static readonly RoutedEvent AnimatedBitmapChangedEvent = EventManager.RegisterRoutedEvent(
"AnimatedBitmapChanged", RoutingStrategy.Bubble,
typeof(RoutedPropertyChangedEventHandler<Bitmap>), typeof(AnimatedImage));
/// <summary>
/// Occurs when the Value property changes.
/// </summary>
public event RoutedPropertyChangedEventHandler<Bitmap> AnimatedBitmapChanged
{
add { AddHandler(AnimatedBitmapChangedEvent, value); }
remove { RemoveHandler(AnimatedBitmapChangedEvent, value); }
}
/// <summary>
/// Raises the ValueChanged event.
/// </summary>
/// <param name="args">Arguments associated with the ValueChanged event.</param>
protected virtual void OnAnimatedBitmapChanged(RoutedPropertyChangedEventArgs<Bitmap> args)
{
RaiseEvent(args);
}
private void UpdateAnimatedBitmap()
{
int nTimeFrames = AnimatedBitmap.GetFrameCount(System.Drawing.Imaging.FrameDimension.Time);
_nCurrentFrame = 0;
if (nTimeFrames > 0)
{
_BitmapSources = new BitmapSource[nTimeFrames];
for (int i = 0; i < nTimeFrames; i++)
{
AnimatedBitmap.SelectActiveFrame(System.Drawing.Imaging.FrameDimension.Time, i);
Bitmap bitmap = new Bitmap(AnimatedBitmap);
bitmap.MakeTransparent();
_BitmapSources[i] = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
bitmap.GetHbitmap(),
IntPtr.Zero,
Int32Rect.Empty,
System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
}
StartAnimate();
}
}
private delegate void VoidDelegate();
private void OnFrameChanged(object o, EventArgs e)
{
Dispatcher.BeginInvoke(DispatcherPriority.Render, new VoidDelegate(delegate { ChangeSource(); }));
}
void ChangeSource()
{
Source = _BitmapSources[_nCurrentFrame++];
_nCurrentFrame = _nCurrentFrame % _BitmapSources.Length;
ImageAnimator.UpdateFrames();
}
public void StopAnimate()
{
if (_bIsAnimating)
{
ImageAnimator.StopAnimate(AnimatedBitmap, new EventHandler(this.OnFrameChanged));
_bIsAnimating = false;
}
}
public void StartAnimate()
{
if (!_bIsAnimating)
{
ImageAnimator.Animate(AnimatedBitmap, new EventHandler(this.OnFrameChanged));
_bIsAnimating = true;
}
}
}
}