获取 aspx 网站 文件原名

Question

            string _url = @"http://www.site.com/getImg.aspx?id=123";
            string _filename = "how to get filename from site";
            //尝试 _HttpWebResponse.Headers["Content-Disposition"]，抓取得到的是空值

Answer 1

请给出完整的代码——你用WebRequest和WebResponse来做的吗？

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Answer 2

            HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(pUrl);
            HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
            for (int i = 0; i < myHttpWebResponse.Headers.Count; ++i)
                Console.WriteLine("Header Name:{0}, Value :{1}", myHttpWebResponse.Headers.Keys[i], myHttpWebResponse.Headers[i]);
            myHttpWebResponse.Close(); 

输出的信息如下，没有 Content-Disposition ：
Header Name:Cache-Control, Value :private

Header Name:Content-Type, Value :image/gif

Header Name:Set-Cookie, Value :.ASPXANONYMOUS=iJOG6vBvzgEkAAAAM2E5YmZmN2ItZTk2OC00MjBjLWJmZjgtYzQ0YTliODcyYzdhTewXLP6UnKbwfD78_r4XugAAAAA1; expires=Sun, 23-Jun-2013 09:06:15 GMT; path=/; HttpOnly,ASP.NET_SessionId=o5uzge45or3hbmuzoo4d0x55; path=/; HttpOnly,AD_RS_COOKIE=20080916; expires=Mon, 15-Apr-2013 22:26:16 GMT; path=/;

Header Name:Server, Value :Microsoft-IIS/7.5

Header Name:X-AspNet-Version, Value :2.0.50727

Header Name:X-Powered-By, Value :ASP.NET

Header Name:Date, Value :Sun, 14 Apr 2013 22:26:15 GMT

Header Name:Content-Length, Value :1870

Answer 3

            using (WebClient client = new WebClient())
            {
                using (Stream rawStream = client.OpenRead(pUrl))
                {
                    string contentDisposition = client.ResponseHeaders["content-disposition"];
                    if (!string.IsNullOrEmpty(contentDisposition))
                    {
                        string lookFor = "filename=";
                        int index = contentDisposition.IndexOf(lookFor, StringComparison.CurrentCultureIgnoreCase);
                        if (index >= 0)
                        {
                            string fileName = contentDisposition.Substring(index + lookFor.Length);
                            Console.WriteLine(fileName);
                        }
                    }
                    else
                        Console.WriteLine("null");
                }
            }

得到的结果也是空值

Answer 4

有很多时候不一定能拿到这个值。

最简单的办法是使用webclient的downloadfile方法，直接下载文件。

有些有扩展名，有些没有，没有的需要你通过页面其他条件来判断了。

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family as water

Answer 5

采用 webclient的downloadfile方法，就无法获取 原文件名了。

Answer 6

一般都是要重命名的

原来名称不规范，或者可能存在重名情况。

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family as water

Answer 7

很感谢您的回复！但是答非所问，对不起。