c# image控件显示bitmap

最新推荐文章于 2025-03-04 19:44:41 发布

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最新推荐文章于 2025-03-04 19:44:41 发布

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文章标签： c#

本文链接：https://blog.youkuaiyun.com/qq_30206643/article/details/127012584

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本文介绍了两种将System.Drawing.Bitmap转换为WPF BitmapSource的方法：一种是通过创建BitmapImage并使用MemoryStream保存为PNG格式，这种方法较慢；另一种是直接利用CreateBitmapSourceFromHBitmap进行转换，速度较快。同时提供了具体的实现代码。

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//慢 1000ms
afterImg.Source = ToBitmapImage(bmp);
public BitmapImage ToBitmapImage(System.Drawing.Bitmap ImageOriginal)
   {
       BitmapImage bitmapImage = new BitmapImage();
       using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
       {
           bitmapImage.BeginInit();
           ImageOriginal.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
           bitmapImage.StreamSource = ms;
           bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
           bitmapImage.EndInit();
           bitmapImage.Freeze();
       }
       return bitmapImage;
   }

//快速 88ms

 public static class BitmapSourceConvert
  {
       /// <summary>
       /// Delete a GDI object
       /// </summary>
       /// <param name="o">The poniter to the GDI object to be deleted</param>
       /// <returns></returns>
       [DllImport("gdi32")]

       private static extern int DeleteObject(IntPtr o);
       /// <summary>
       /// Convert an Bitmap to a WPF BitmapSource. The result can be used in the Set Property of Image.Source
       /// </summary>
       /// <param name="image">Bitmap</param>
       /// <returns>The equivalent BitmapSource</returns>
       public static BitmapSource ToBitmapSource(System.Drawing.Bitmap image)
       {
           IntPtr ptr = image.GetHbitmap();//obtain the Hbitmap
           BitmapSource bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap
           (
               ptr,
               IntPtr.Zero,
               Int32Rect.Empty,
               System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions()
           );
           DeleteObject(ptr);//release the HBitmap
           return bs;
       }
   }
afterImg.Source = BitmapSourceConvert.ToBitmapSource(bmp);