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;
 }
 }
}

以上就是本文的全部内容，希望对大家学习c#将图片和字节流互相转换并显示到页面上有所帮助。