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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