从System.Drawing.Bitmap加载WPF BitmapImage

我有一个实例，System.Drawing.Bitmap并且希望以的形式将其提供给我的WPF应用System.Windows.Media.Imaging.BitmapImage。

最好的方法是什么？

如何从MemoryStream加载它？

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();
}

感谢Hallgrim，这是我最终得到的代码：

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

我也最终绑定到BitmapSource而不是原始问题中的BitmapImage

我知道已经回答了，但是这里有一些扩展方法（用于.NET 3.0+）可以进行转换。:)

        /// <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（以安抚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);
}

我花了一些时间才能使转换同时进行，所以这是我想到的两种扩展方法：

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;
        }
    }
}

最简单的方法是，您可以直接从文件中制作WPF位图。

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

// at class level;
[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);    // https://stackoverflow.com/a/1546121/194717


/// <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;
}

您只需编写自定义位图源，即可在两个名称空间（媒体和图形）之间共享pixeldata。转换将立即发生，并且不会分配额外的内存。如果您不想显式创建位图的副本，则可以使用这种方法。

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
}

我在图像处理供应商处工作，并为WPF编写了一个适配器，将其转换为类似于System.Drawing.Bitmap的图像格式。

我写了这个知识库，向我们的客户解释：

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

那里有执行此操作的代码。您需要用Bitmap替换AtalaImage并执行我们正在做的等效工作-它应该非常简单。

我对此有很多了解。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;
            }
        }
    }
}

我之所以遇到这个问题，是因为我试图这样做，但就我而言，位图来自资源/文件。我发现最佳解决方案如以下链接所述：

http://msdn.microsoft.com/zh-CN/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;