c# Bitmap转bitmapImage高效方法

网上有很多人都记录以下方法进行转换，这个方法存在一个问题，就是低效，我在进行图片拼接时，图片大了之后就会很慢。所以我有找了一个高效的替代方法。

 public BitmapImage BitmapToBitmapImage(System.Drawing.Bitmap bitmap)
        {
            System.Drawing.Bitmap bitmapSource = new System.Drawing.Bitmap(bitmap.Width, bitmap.Height);
            int i, j;
            for (i = 0; i < bitmap.Width; i++)
                for (j = 0; j < bitmap.Height; j++)
                {
                    System.Drawing.Color pixelColor = bitmap.GetPixel(i, j);
                    System.Drawing.Color newColor = System.Drawing.Color.FromArgb(pixelColor.R, pixelColor.G, pixelColor.B);
                    bitmapSource.SetPixel(i, j, newColor);
                }
            MemoryStream ms = new MemoryStream();
            bitmapSource.Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);
            BitmapImage bitmapImage = new BitmapImage();
            bitmapImage.BeginInit();
            bitmapImage.StreamSource = new MemoryStream(ms.ToArray());
            bitmapImage.EndInit();
 
            return bitmapImage;
        }

这种方法快多了。赶紧快去试试吧：

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

补：C# Byte[]、Image、Bitmap 之间的相互转换

/// <summary>  
        /// 将图片Image转换成Byte[]  
        /// </summary>  
        /// <param name="Image">image对象</param>  
        /// <param name="imageFormat">后缀名</param>  
        /// <returns></returns>  
        public static byte[] ImageToBytes(Image Image, System.Drawing.Imaging.ImageFormat imageFormat)  
        {  
  
            if (Image == null) { return null; }  
  
            byte[] data = http://www.cnblogs.com/peasana/archive/2012/02/13/null;  
  
            using (MemoryStream ms= new MemoryStream())  
            {  
  
                 using (Bitmap Bitmap = new Bitmap(Image))  
                {  
  
                    Bitmap.Save(ms, imageFormat);  
  
                    ms.Position = 0;  
  
                    data = http://www.cnblogs.com/peasana/archive/2012/02/13/new byte[ms.Length];  
  
                    ms.Read(data, 0, Convert.ToInt32(ms.Length));  
  
                    ms.Flush();  
  
                }  
  
            }  
  
            return data;  
  
        }  

            /// <summary>  
            /// byte[]转换成Image  
            /// </summary>  
            /// <param name="byteArrayIn">二进制图片流</param>  
            /// <returns>Image</returns>  
            public static System.Drawing.Image byteArrayToImage(byte[] byteArrayIn)  
            {  
                if (byteArrayIn == null)  
                    return null;  
                using (System.IO.MemoryStream ms = new System.IO.MemoryStream(byteArrayIn))  
                {  
                    System.Drawing.Image returnImage = System.Drawing.Image.FromStream(ms);  
                    ms.Flush();  
                    return returnImage;  
                }  
            }    
  
    //Image转换Bitmap  
  
   1. Bitmap img = new Bitmap(imgSelect.Image);  
  
   2. Bitmap bmp = (Bitmap)pictureBox1.Image;  
  
     
//Bitmap转换成Image  
  
using System.IO;  
  
private static System.Windows.Controls.Image Bitmap2Image(System.Drawing.Bitmap Bi)  
        {             
            MemoryStream ms = new MemoryStream();  
            Bi.Save(ms, System.Drawing.Imaging.ImageFormat.Png);  
            BitmapImage bImage = new BitmapImage();  
            bImage.BeginInit();  
            bImage.StreamSource = new MemoryStream(ms.ToArray());  
            bImage.EndInit();  
            ms.Dispose();  
            Bi.Dispose();  
            System.Windows.Controls.Image i = new System.Windows.Controls.Image();  
            i.Source = bImage;  
            return i ;  
        }    
  
//byte[] 转换 Bitmap  
 public static Bitmap BytesToBitmap(byte[] Bytes)   
        {   
            MemoryStream stream = null;   
            try   
            {   
                stream = new MemoryStream(Bytes);   
                return new Bitmap((Image)new Bitmap(stream));   
            }   
            catch (ArgumentNullException ex)   
            {   
                throw ex;   
            }   
            catch (ArgumentException ex)   
            {   
                throw ex;   
            }   
            finally   
            {   
                stream.Close();   
            }   
        }    
   
//Bitmap转byte[]    
        public static byte[] BitmapToBytes(Bitmap Bitmap)   
        {   
            MemoryStream ms = null;   
            try   
            {   
                ms = new MemoryStream();   
                Bitmap.Save(ms, Bitmap.RawFormat);   
                byte[] byteImage = new Byte[ms.Length];   
                byteImage = ms.ToArray();   
                return byteImage;   
            }   
            catch (ArgumentNullException ex)   
            {   
                throw ex;   
            }   
            finally   
            {   
                ms.Close();   
            }   
        }   
    }   

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