从System.Drawing.Bitmap加载WPF BitmapImage

我有一个System.Drawing.Bitmap的实例，并希望以System.Windows.Media.Imaging.BitmapImage的forms提供给我的WPF应用程序。

什么是最好的办法呢？

Answer 1

从MemoryStream加载它怎么样？

 using(MemoryStream memory = new MemoryStream()) { bitmap.Save(memory, ImageFormat.Png); memory.Position = 0; BitmapImage bitmapImage = new BitmapImage(); bitmapImage.BeginInit(); bitmapImage.StreamSource = memory; bitmapImage.CacheOption = BitmapCacheOption.OnLoad; bitmapImage.EndInit(); } 

Answer 2

感谢Hallgrim，这里是我结束的代码：

 ScreenCapture = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap( bmp.GetHbitmap(), IntPtr.Zero, System.Windows.Int32Rect.Empty, BitmapSizeOptions.FromWidthAndHeight(width, height)); 

我也结束了绑定到一个BitmapSource，而不是像我原来的问题

Answer 3

我知道这已经被回答，但是这里有几个扩展方法（用于.NET 3.0+）来进行转换。 🙂

  /// <summary> /// Converts a <see cref="System.Drawing.Image"/> into a WPF <see cref="BitmapSource"/>. /// </summary> /// <param name="source">The source image.</param> /// <returns>A BitmapSource</returns> public static BitmapSource ToBitmapSource(this System.Drawing.Image source) { System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(source); var bitSrc = bitmap.ToBitmapSource(); bitmap.Dispose(); bitmap = null; return bitSrc; } /// <summary> /// Converts a <see cref="System.Drawing.Bitmap"/> into a WPF <see cref="BitmapSource"/>. /// </summary> /// <remarks>Uses GDI to do the conversion. Hence the call to the marshalled DeleteObject. /// </remarks> /// <param name="source">The source bitmap.</param> /// <returns>A BitmapSource</returns> public static BitmapSource ToBitmapSource(this System.Drawing.Bitmap source) { BitmapSource bitSrc = null; var hBitmap = source.GetHbitmap(); try { bitSrc = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap( hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); } catch (Win32Exception) { bitSrc = null; } finally { NativeMethods.DeleteObject(hBitmap); } return bitSrc; } 

和NativeMethods类（为了安抚FxCop）

  /// <summary> /// FxCop requires all Marshalled functions to be in a class called NativeMethods. /// </summary> internal static class NativeMethods { [DllImport("gdi32.dll")] [return: MarshalAs(UnmanagedType.Bool)] internal static extern bool DeleteObject(IntPtr hObject); } 

Answer 4

我花了一些时间来使转换工作双向，所以这里是我提出的两个扩展方法：

 using System.Drawing; using System.Drawing.Imaging; using System.IO; using System.Windows.Media.Imaging; public static class BitmapConversion { public static Bitmap ToWinFormsBitmap(this BitmapSource bitmapsource) { using (MemoryStream stream = new MemoryStream()) { BitmapEncoder enc = new BmpBitmapEncoder(); enc.Frames.Add(BitmapFrame.Create(bitmapsource)); enc.Save(stream); using (var tempBitmap = new Bitmap(stream)) { // According to MSDN, one "must keep the stream open for the lifetime of the Bitmap." // So we return a copy of the new bitmap, allowing us to dispose both the bitmap and the stream. return new Bitmap(tempBitmap); } } } public static BitmapSource ToWpfBitmap(this Bitmap bitmap) { using (MemoryStream stream = new MemoryStream()) { bitmap.Save(stream, ImageFormat.Bmp); stream.Position = 0; BitmapImage result = new BitmapImage(); result.BeginInit(); // According to MSDN, "The default OnDemand cache option retains access to the stream until the image is needed." // Force the bitmap to load right now so we can dispose the stream. result.CacheOption = BitmapCacheOption.OnLoad; result.StreamSource = stream; result.EndInit(); result.Freeze(); return result; } } } 

Answer 5

最简单的是，如果你可以直接从文件中创buildWPF位图。

否则，你将不得不使用System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap。

Answer 6

 /// <summary> /// Converts a <see cref="System.Drawing.Bitmap"/> into a WPF <see cref="BitmapSource"/>. /// </summary> /// <remarks>Uses GDI to do the conversion. Hence the call to the marshalled DeleteObject. /// </remarks> /// <param name="source">The source bitmap.</param> /// <returns>A BitmapSource</returns> public static System.Windows.Media.Imaging.BitmapSource ToBitmapSource(this System.Drawing.Bitmap source) { var hBitmap = source.GetHbitmap(); var result = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, System.Windows.Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()); DeleteObject(hBitmap); return result; } 

Answer 7

我在一家影像供应商工作，并为我们的图像格式写了一个适用于WPF的适配器，类似于System.Drawing.Bitmap。

我写这个知识库给我们的客户解释：

http://www.atalasoft.com/kb/article.aspx?id=10156

那里有代码。 你需要用BitmapreplaceAtalaImage，并且做同样的事情，我们正在做 – 它应该是非常简单的。

Answer 8

我从这些资源build立起来的。 https://stackoverflow.com/a/7035036 https://stackoverflow.com/a/1470182/360211

 using System; using System.Drawing; using System.Runtime.ConstrainedExecution; using System.Runtime.InteropServices; using System.Security; using System.Windows; using System.Windows.Interop; using System.Windows.Media.Imaging; using Microsoft.Win32.SafeHandles; namespace WpfHelpers { public static class BitmapToBitmapSource { public static BitmapSource ToBitmapSource(this Bitmap source) { using (var handle = new SafeHBitmapHandle(source)) { return Imaging.CreateBitmapSourceFromHBitmap(handle.DangerousGetHandle(), IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions()); } } [DllImport("gdi32")] private static extern int DeleteObject(IntPtr o); private sealed class SafeHBitmapHandle : SafeHandleZeroOrMinusOneIsInvalid { [SecurityCritical] public SafeHBitmapHandle(Bitmap bitmap) : base(true) { SetHandle(bitmap.GetHbitmap()); } [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] protected override bool ReleaseHandle() { return DeleteObject(handle) > 0; } } } } 

Answer 9

你可以通过编写一个自定义的bitmapsource来共享这两个命名空间（Media和Drawing）之间的像素数据。 转换将立即发生，不会分配额外的内存。 如果你不想明确地创build你的位图的副本，这是你想要的方法。

 class SharedBitmapSource : BitmapSource, IDisposable { #region Public Properties /// <summary> /// I made it public so u can reuse it and get the best our of both namespaces /// </summary> public Bitmap Bitmap { get; private set; } public override double DpiX { get { return Bitmap.HorizontalResolution; } } public override double DpiY { get { return Bitmap.VerticalResolution; } } public override int PixelHeight { get { return Bitmap.Height; } } public override int PixelWidth { get { return Bitmap.Width; } } public override System.Windows.Media.PixelFormat Format { get { return ConvertPixelFormat(Bitmap.PixelFormat); } } public override BitmapPalette Palette { get { return null; } } #endregion #region Constructor/Destructor public SharedBitmapSource(int width, int height,System.Drawing.Imaging.PixelFormat sourceFormat) :this(new Bitmap(width,height, sourceFormat) ) { } public SharedBitmapSource(Bitmap bitmap) { Bitmap = bitmap; } // Use C# destructor syntax for finalization code. ~SharedBitmapSource() { // Simply call Dispose(false). Dispose(false); } #endregion #region Overrides public override void CopyPixels(Int32Rect sourceRect, Array pixels, int stride, int offset) { BitmapData sourceData = Bitmap.LockBits( new Rectangle(sourceRect.X, sourceRect.Y, sourceRect.Width, sourceRect.Height), ImageLockMode.ReadOnly, Bitmap.PixelFormat); var length = sourceData.Stride * sourceData.Height; if (pixels is byte[]) { var bytes = pixels as byte[]; Marshal.Copy(sourceData.Scan0, bytes, 0, length); } Bitmap.UnlockBits(sourceData); } protected override Freezable CreateInstanceCore() { return (Freezable)Activator.CreateInstance(GetType()); } #endregion #region Public Methods public BitmapSource Resize(int newWidth, int newHeight) { Image newImage = new Bitmap(newWidth, newHeight); using (Graphics graphicsHandle = Graphics.FromImage(newImage)) { graphicsHandle.InterpolationMode = InterpolationMode.HighQualityBicubic; graphicsHandle.DrawImage(Bitmap, 0, 0, newWidth, newHeight); } return new SharedBitmapSource(newImage as Bitmap); } public new BitmapSource Clone() { return new SharedBitmapSource(new Bitmap(Bitmap)); } //Implement IDisposable. public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } #endregion #region Protected/Private Methods private static System.Windows.Media.PixelFormat ConvertPixelFormat(System.Drawing.Imaging.PixelFormat sourceFormat) { switch (sourceFormat) { case System.Drawing.Imaging.PixelFormat.Format24bppRgb: return PixelFormats.Bgr24; case System.Drawing.Imaging.PixelFormat.Format32bppArgb: return PixelFormats.Pbgra32; case System.Drawing.Imaging.PixelFormat.Format32bppRgb: return PixelFormats.Bgr32; } return new System.Windows.Media.PixelFormat(); } private bool _disposed = false; protected virtual void Dispose(bool disposing) { if (!_disposed) { if (disposing) { // Free other state (managed objects). } // Free your own state (unmanaged objects). // Set large fields to null. _disposed = true; } } #endregion } 

Answer 10

我来到这个问题，因为我想这样做，但在我的情况下，位图来自资源/文件。 我发现最好的解决scheme是在以下链接中描述：

http://msdn.microsoft.com/en-us/library/system.windows.media.imaging.bitmapimage.aspx

 // Create the image element. Image simpleImage = new Image(); simpleImage.Width = 200; simpleImage.Margin = new Thickness(5); // Create source. BitmapImage bi = new BitmapImage(); // BitmapImage.UriSource must be in a BeginInit/EndInit block. bi.BeginInit(); bi.UriSource = new Uri(@"/sampleImages/cherries_larger.jpg",UriKind.RelativeOrAbsolute); bi.EndInit(); // Set the image source. simpleImage.Source = bi;