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以下介绍两种方法:
1.利用WebRequest,WebResponse 类
WebRequest wreq=WebRequest.Create("//img.jbzj.com/file_images/article/201205/logo.gif");
    HttpWebResponse wresp=(HttpWebResponse)wreq.GetResponse();
    Stream s=wresp.GetResponseStream();   
    System.Drawing.Image img;
    img = System.Drawing.Image.FromStream(s); 
    img.Save("D:\\aa.gif",ImageFormat.Gif);   //保存
//下面直接输出
MemoryStream ms=new MemoryStream();
    img.Save(ms,ImageFormat.Gif);
    img.Dispose();
    Response.ClearContent();
    Response.ContentType="image/gif";
    Response.BinaryWrite(ms.ToArray());
2.利用 WebClient 类
WebClient my=new WebClient();
    byte[] mybyte; 
    mybyte=my.DownloadData("//img.jbzj.com/file_images/article/201205/logo.gif");            MemoryStream ms=new MemoryStream(mybyte);  
    System.Drawing.Image img;
    img = System.Drawing.Image.FromStream(ms); 
    img.Save("D:\\a.gif",ImageFormat.Gif);   //保存
//下面直接输出
Response.ClearContent();
    Response.ContentType="image/gif";
    Response.BinaryWrite(mybyte);
如果是真实的图片地址直接用
my.DownloadFile("//img.jbzj.com/file_images/article/201205/logo.gif","D:\\a.gif");   //保存
直接可以保存
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清风细雨楼 Design By www.eepep.com