C#将图片和字节流互相转换并显示到页面上

图片转换成字节流先要转换的IMage对象，转换之后返回字节流。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，感兴趣的朋友看下下面的代码。

C#将图片和字节流相互转换代码：

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

//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stream
Stream stream = CategoriesPicture.GetPicture(CategoryID);
if (stream !=null) {
//取得图片stream大小
int buffersize = (int)stream.Length;
//建立buffer
System.Byte[] buffer = new System.Byte[buffersize ] ;
//调用stream.Read，从stream读取到buffer，并返回count
int count = stream.Read(buffer, 0, buffersize);
//返回图片字段buffer
if (count!=0)
context.Response.OutputStream.Write(buffer, 0, count);
}
}
public bool IsReusable {
get {
return false;
}
}
}