WPF跑GIF文件的方法

注：本工程来codeproject

WPF默认的IMAGE是无法让GIF文件动起来的。

下面为一种可以让GIF在WPF中动起来的办法。

关键还在AnimatedGIFControl.cs文件中。

/****************************** Module Header ******************************\
Module Name:    AnimatedGIFControl.cs
Project:        CSWPFAnimatedGIF
Copyright (c) Microsoft Corporation.

The CSWPFAnimatedGIF demonstrates how to implement
an animated GIF image in WPF.

This source is subject to the Microsoft Public License.
See
All other rights reserved.

THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR PURPOSE.
\***************************************************************************/

using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media.Imaging;
using System.Windows.Threading;

namespace CSWPFAnimatedGIF
{
    public class AnimatedGIFControl : System.Windows.Controls.Image
    {
        private Bitmap _bitmap; // Local bitmap member to cache image resource
        private BitmapSource _bitmapSource;
        public delegate void FrameUpdatedEventHandler();


        ///
        /// Delete local bitmap resource
        /// Reference: (VS.85).aspx
        ///
        [DllImport("gdi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern bool DeleteObject(IntPtr hObject);

        ///
        /// Override the OnInitialized method
        ///
        protected override void OnInitialized(EventArgs e)
        {
            base.OnInitialized(e);
            this.Loaded += new RoutedEventHandler(AnimatedGIFControl_Loaded);
            this.Unloaded += new RoutedEventHandler(AnimatedGIFControl_Unloaded);
        }

        ///
        /// Load the embedded image for the Image.Source
        ///
        void AnimatedGIFControl_Loaded(object sender, RoutedEventArgs e)
        {
            // Get GIF image from Resources
            if (Properties.Resources.ProgressIndicator != null)
            {
                _bitmap = Properties.Resources.ProgressIndicator;
                Width = _bitmap.Width;
                Height = _bitmap.Height;

                _bitmapSource = GetBitmapSource();
                Source = _bitmapSource;
            }
        }

        ///
        /// Close the FileStream to unlock the GIF file
        ///
        private void AnimatedGIFControl_Unloaded(object sender, RoutedEventArgs e)
        {
            StopAnimate();
        }

        ///
        /// Start animation
        ///
        public void StartAnimate()
        {
            ImageAnimator.Animate(_bitmap, OnFrameChanged);
        }

        ///
        /// Stop animation
        ///
        public void StopAnimate()
        {
            ImageAnimator.StopAnimate(_bitmap, OnFrameChanged);
        }

        ///
        /// Event handler for the frame changed
        ///
        private void OnFrameChanged(object sender, EventArgs e)
        {
            Dispatcher.BeginInvoke(DispatcherPriority.Normal,
                                   new FrameUpdatedEventHandler(FrameUpdatedCallback));
        }

        private void FrameUpdatedCallback()
        {
            ImageAnimator.UpdateFrames();

            if (_bitmapSource != null)
                _bitmapSource.Freeze();

            // Convert the bitmap to BitmapSource that can be display in WPF Visual Tree
            _bitmapSource = GetBitmapSource();
            Source = _bitmapSource;
            InvalidateVisual();
        }

        private BitmapSource GetBitmapSource()
        {
            IntPtr handle = IntPtr.Zero;

            try
            {
                handle = _bitmap.GetHbitmap();
                _bitmapSource = Imaging.CreateBitmapSourceFromHBitmap(
                    handle, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
            }
            finally
            {
                if (handle != IntPtr.Zero)
                    DeleteObject(handle);
            }

            return _bitmapSource;
        }

    }
}

测试工程代码：
Show GIF animation in WPF (CSWPFAnimatedGIF).rar