C#将图片与字节流相互转换并显示到页面上示例源码，图片转换成字节流先要转换的IMage对象，转换后返回字节流。字节流转换成图片，要转换的字节流，转换得到的Image对象，根据图片路径返回图片的字节流。
C#将图片和字节流相互转换代码：
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usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Drawing;usingSystem.IO;namespaceMicrosoft.Form.Base{classImageToByte{/// <summary>/// 图片转换成字节流/// </summary>/// <param name="img">要转换的Image对象</param>/// <returns>转换后返回的字节流</returns>publicstaticbyte[] ImgToByt(Image img){MemoryStream ms = newMemoryStream();byte[] imagedata = null;img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);imagedata = ms.GetBuffer();returnimagedata;}/// <summary>/// 字节流转换成图片/// </summary>/// <param name="byt">要转换的字节流</param>/// <returns>转换得到的Image对象</returns>publicstaticImage BytToImg(byte[] byt){MemoryStream ms = newMemoryStream(byt);Image img = Image.FromStream(ms);returnimg;}///// <summary>/// 根据图片路径返回图片的字节流byte[]/// </summary>/// <param name="imagePath">图片路径</param>/// <returns>返回的字节流</returns>privatestaticbyte[] getImageByte(stringimagePath){FileStream files = newFileStream(imagePath, FileMode.Open);byte[] imgByte = newbyte[files.Length];files.Read(imgByte, 0, imgByte.Length);files.Close();returnimgByte;}}} |
将字节流转换为图片文件显示到页面上
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//Byte[] result;System.IO.MemoryStream ms =new
MemoryStream(result, 0, result.Length) Response.ClearContent();Response.ContentType = "image/Gif";Response.BinaryWrite(ms.ToArray());或者添加一个处理图片的Handler，内容如下：<%@ WebHandler Language="C#"
Class="Handler"
%>using
System.Web;using
System.IO;public
class
Handler : IHttpHandler {public
void
ProcessRequest (HttpContext context) {int
CategoryID = int.Parse(context.Request.QueryString["CategoryID"]);//调用Categories.GetPicture取得图片streamStream stream = CategoriesPicture.GetPicture(CategoryID);if
(stream !=null) {//取得图片stream大小int
buffersize = (int)stream.Length;//建立bufferSystem.Byte[] buffer = new
System.Byte[buffersize ] ;//调用stream.Read，从stream读取到buffer，并返回countint
count = stream.Read(buffer, 0, buffersize);//返回图片字段bufferif
(count!=0)context.Response.OutputStream.Write(buffer, 0, count);}}public
bool
IsReusable {get
{return
false;}}} |