将BitmapImage转换为Bitmap，反之亦然

无需使用外部库。

将BitmapImage转换为Bitmap：

private Bitmap BitmapImage2Bitmap(BitmapImage bitmapImage){    // BitmapImage bitmapImage = new BitmapImage(new Uri("../Images/test.png", UriKind.Relative));    using(MemoryStream outStream = new MemoryStream())    {        BitmapEnprer enc = new BmpBitmapEnprer();        enc.frames.Add(Bitmapframe.Create(bitmapImage));        enc.Save(outStream);        System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(outStream);        return new Bitmap(bitmap);    }}

要将位图转换回BitmapImage：

[System.Runtime.InteropServices.Dllimport("gdi32.dll")]public static extern bool DeleteObject(IntPtr hObject);private BitmapImage Bitmap2BitmapImage(Bitmap bitmap){    IntPtr hBitmap = bitmap.GetHbitmap();    BitmapImage retval;    try    {        retval = (BitmapImage)Imaging.CreateBitmapSourceFromHBitmap(          hBitmap,          IntPtr.Zero,          Int32Rect.Empty,          BitmapSizeOptions.FromEmptyOptions());    }    finally    {        DeleteObject(hBitmap);    }    return retval;}