C#byte數組與Image的相互轉換實例代碼
功能需求：
1、把一張圖片（png bmp jpeg bmp gif）轉換為byte數組存放到數據庫。
2、把從數據庫讀取的byte數組轉換為Image對象，賦值給相應的控件顯示。
3、從圖片byte數組得到對應圖片的格式，生成一張圖片保存到磁盤上。
這里的Image是System.Drawing.Image。
//Get an image from file Image image = Image.FromFile("D://test.jpg"); Bitmap bitmap = new Bitmap("D://test.jpg");以下三個函數分別實現了上述三個需求：
using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using System.IO;using System.Linq;using System.Text;namespace NetUtilityLib{ public static class ImageHelper { /// <summary> /// Convert Image to Byte[] /// </summary> /// <param name="image"></param> /// <returns></returns> public static byte[] ImageToBytes(Image image) { ImageFormat format = image.RawFormat; using (MemoryStream ms = new MemoryStream()) { if (format.Equals(ImageFormat.Jpeg)) { image.Save(ms, ImageFormat.Jpeg); } else if (format.Equals(ImageFormat.Png)) { image.Save(ms, ImageFormat.Png); } else if (format.Equals(ImageFormat.Bmp)) { image.Save(ms, ImageFormat.Bmp); } else if (format.Equals(ImageFormat.Gif)) { image.Save(ms, ImageFormat.Gif); } else if (format.Equals(ImageFormat.Icon)) { image.Save(ms, ImageFormat.Icon); } byte[] buffer = new byte[ms.Length]; //Image.Save()會改變MemoryStream的Position，需要重新Seek到Begin ms.Seek(0, SeekOrigin.Begin); ms.Read(buffer, 0, buffer.Length); return buffer; } } /// <summary> /// Convert Byte[] to Image /// </summary> /// <param name="buffer"></param> /// <returns></returns> public static Image BytesToImage(byte[] buffer) { MemoryStream ms = new MemoryStream(buffer); Image image = System.Drawing.Image.FromStream(ms); return image; } /// <summary> /// Convert Byte[] to a picture and Store it in file /// </summary> /// <param name="fileName"></param> /// <param name="buffer"></param> /// <returns></returns> public static string CreateImageFromBytes(string fileName, byte[] buffer) { string file = fileName; Image image = BytesToImage(buffer); ImageFormat format = image.RawFormat; if (format.Equals(ImageFormat.Jpeg)) { file += ".jpeg"; } else if (format.Equals(ImageFormat.Png)) { file += ".png"; } else if (format.Equals(ImageFormat.Bmp)) { file += ".bmp"; } else if (format.Equals(ImageFormat.Gif)) { file += ".gif"; } else if (format.Equals(ImageFormat.Icon)) { file += ".icon"; } System.IO.FileInfo info = new System.IO.FileInfo(file); System.IO.Directory.CreateDirectory(info.Directory.FullName); File.WriteAllBytes(file, buffer); return file; } }}感謝閱讀，希望能幫助到大家，謝謝大家對本站的支持！
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