ASP.NET下载远程图片保存到本地的方法、保存抓取远程图片

以下介绍两种方法：

1.利用WebRequest，WebResponse 类 

WebRequest wreq=WebRequest.Create("http://www.xueit.com/eimg/uploadfile/downpig/20098/098215331763.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("http://www.xueit.com/eimg/uploadfile/downpig/20098/098215331763.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("http://www.xueit.com/eimg/uploadfile/downpig/20098/098215331763.gif","D:\\a.gif");   //保存 

直接可以保存