来自 ASP.net 中的 ftp 的 Pdf 在浏览器中看起来是空的

Question

我想在浏览器中显示来自 ftp 的 pdf 文件。我找到了一些代码，我已经尝试过了。 pdf 显示在浏览器中，但文件为空。它具有所有页面作为原始文件，但没有页面上的内容。

string filename = Request.QueryString["view"];    
FileInfo objFile = new FileInfo(filename);

System.Net.FtpWebRequest request = (System.Net.FtpWebRequest)WebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + objFile.Name));
request.Credentials = new NetworkCredential(Ftp_Login_Name,Ftp_Login_Password);

System.Net.FtpWebResponse response = (System.Net.FtpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(responseStream);

Stream responseStream = response.GetResponseStream();
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.ContentEncoding = reader.CurrentEncoding;
Response.ContentType = "application/pdf";            
Response.AddHeader("Content-Disposition", "inline; filename=" + Request.QueryString["name"]);
Response.Write(reader.ReadToEnd());
Response.End();

如何在浏览器中正确显示？ http://i.stack.imgur.com/8weMr.png

Answer 1

试试这个：

FileInfo objFile = new FileInfo(filename);
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(new Uri("ftp://" + ftpServerIP + "/" + filename));
request.Credentials = new NetworkCredential(Ftp_Login_Name, Ftp_Login_Password);

FtpWebResponse response = (FtpWebResponse)request.GetResponse();

Stream responseStream = response.GetResponseStream();
StreamReader reader = new StreamReader(responseStream);

byte[] bytes = null;
using (var memstream = new MemoryStream())
{
    reader.BaseStream.CopyTo(memstream);
    bytes = memstream.ToArray();
}

Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/pdf";
Response.AddHeader("Content-Disposition", "inline; filename=" + objFile.Name);
Response.BinaryWrite(bytes);
Response.End();

Answer 2

Response.Write 用于向客户端发送文本。 PDF 文件包含二进制内容，因此内容可能会被错误地转换。

请改用Response.BinaryWrite。此外，在您的代码中，您没有发送文件。试试这个：

FileStream fs = File.OpenRead(filename);

int length = (int)fs.Length;
BinaryReader br = new BinaryReader(fs);
byte[] buffer = br.ReadBytes(length);

Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.ContentEncoding = reader.CurrentEncoding;
Response.ContentType = "application/pdf";            
Response.AddHeader("Content-Disposition", "inline; filename=" + Request.QueryString["name"]);
Response.BinaryWrite(buffer);