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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