我目前正在尝试在 WPF 中显示和播放动画 gif，但运气不佳
我已经尝试了找到的所有解决方案 here包括问题中的那个
这是我目前拥有的
<Window x:Class="Sooooothing.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Attached="clr-namespace:Sooooothing"
Title="MainWindow" Height="327.861" Width="525">
<Grid>
<MediaElement x:Name="gif" MediaEnded="myGif_MediaEnded" UnloadedBehavior="Manual"
Source="Images\7c6516d73fc8643abf1df969fcc1a72c.gif"
LoadedBehavior="Play" Stretch="None"/>
</Grid>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace Sooooothing
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
//gif.Play();
}
private void myGif_MediaEnded(object sender, RoutedEventArgs e)
{
gif.Position = new TimeSpan(0, 0, 1);
gif.Play();
}
}
}
当应用程序启动时，我得到的只是窗口的白色背景，起初我以为是 gif 没有加载，但我让它静置几分钟，没有任何变化。
这是我的解决方案
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace Sooooothing
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
GifBitmapDecoder decoder2;
int ImageNumber = 0;
bool mouseIn = true;
double opasity = 0;
List<Thread> threadList = new List<Thread>();
bool programClosed = false;
public MainWindow()
{
InitializeComponent();
Classes.DataHouse.load(); //Im storing all my gif links in this List<string> so i can
// loop through them with buttons on the window
#region thread gif frame changer
Uri myUri = new Uri(Classes.DataHouse.images[ImageNumber], UriKind.RelativeOrAbsolute);
decoder2 = new GifBitmapDecoder(myUri, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
BitmapSource bitmapSource2; // Decode the gif using GifBitmapDecoder then start a thread to
int frameCount = decoder2.Frames.Count;// loop through all the images and put them one after
Thread th = new Thread(() => {// another into an image on your window
while (!programClosed)
{
for (int i = 0; i < frameCount; i++)
{
try{
this.Dispatcher.Invoke(new Action(delegate()
{
frameCount = decoder2.Frames.Count;
if (frameCount >= i)
{
bitmapSource2 = decoder2.Frames[i];
image.Source = bitmapSource2;
}
}));
}
catch
{
//the thread was probably aborted
}
System.Threading.Thread.Sleep(100);
}
}
});
threadList.Add(th);
th.Start();
#endregion
}
private void Window_MouseDown(object sender, MouseButtonEventArgs e)
{
if (e.ChangedButton == MouseButton.Left)
this.DragMove();
}
private void img_forward_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (ImageNumber+1 >= Classes.DataHouse.images.Count)
ImageNumber = 0;
else
ImageNumber++;
Uri myUri = new Uri(Classes.DataHouse.images[ImageNumber], UriKind.RelativeOrAbsolute);
decoder2 = new GifBitmapDecoder(myUri, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
}
private void Grid_MouseEnter(object sender, MouseEventArgs e)
{
mouseIn = true;
Thread th = new Thread(() =>
{
while (opasity < 100 && mouseIn)
{
System.Threading.Thread.Sleep(25);
opasity++;
try
{
this.Dispatcher.Invoke(new Action(delegate()
{
img_forward.Opacity = opasity / 100;
img_exit.Opacity = opasity / 100;
img_backward.Opacity = opasity / 100;
}));
}
catch
{
//the thread was probably aborted
}
}
});
threadList.Add(th);
th.Start();
}
private void Grid_MouseLeave(object sender, MouseEventArgs e)
{
mouseIn = false;
Thread th = new Thread(() =>
{
while (opasity > 0 && !mouseIn)
{
System.Threading.Thread.Sleep(25);
opasity--;
try{
this.Dispatcher.Invoke(new Action(delegate()
{
img_forward.Opacity = opasity / 100;
img_exit.Opacity = opasity / 100;
img_backward.Opacity = opasity / 100;
}));
}
catch
{
//the thread was probably aborted
}
}
});
threadList.Add(th);
th.Start();
}
private void img_backward_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (ImageNumber - 1 < 0)
ImageNumber = Classes.DataHouse.images.Count-1;
else
ImageNumber--;
Uri myUri = new Uri(Classes.DataHouse.images[ImageNumber], UriKind.RelativeOrAbsolute);
decoder2 = new GifBitmapDecoder(myUri, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
}
private void img_exit_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
foreach (Thread th in threadList)
{
while(th.ThreadState == ThreadState.Running)
th.Abort();
}
programClosed = true;
this.Close();
}
}
}
最佳答案
不幸的是，在 Microsoft 开发 WPF 时，动画 GIF 图像在某种程度上是一个疏忽，因此没有处理此问题的“内置”功能。在网上找到了几个有效的示例，但您仍然应该知道代码需要在 UI 线程上运行才能为这些图像设置动画。
因此，某些情况下，例如在加载期间尝试使用“繁忙”的 GIF 将无法正常工作，因为 UI 线程已经很忙了。
宣布该免责声明后，您可以在 Thomas Levesque 的 GitHub 项目中找到一些工作代码来执行您想要的操作，链接如下:
关于c# - 在 WPF 中播放 Gif，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30803184/