使用C＃從oracle數據庫顯示pdf文件（pdf路徑存儲在數據庫中）？

Question

C＃代碼：

HyperLink1.NavigateUrl = "Pdfhandler.ashx?empid=" + TextBox8.Text; 

Pdfhandler.ashx代碼：

{ 

     MemoryStream memoryStream = new MemoryStream(); 

     string sql = "SELECT pdfpath FROM pdfstore WHERE empl_code = " + id + ""; 

     OracleCommand cmd = new OracleCommand(sql, connection); 
     //cmd.Parameters.AddWithValue("@id", id); 
     connection.Open(); 

     OracleDataReader reader = cmd.ExecuteReader(); 
     reader.Read(); 
     if (reader.HasRows) 
     { 
      //byte[] file = Encoding.ASCII.GetBytes("imgpath"); 
      //byte[] file = Encoding.UTF8.GetBytes("imgpath"); 
      //Get Image Data 
      //byte[] file = (byte[])reader["imgpath"]; 
      byte[] file = File.ReadAllBytes(reader["pdfpath"].ToString()); 

      reader.Close(); 
      connection.Close(); 
      memoryStream.Write(file, 0, file.Length); 
      context.Response.Buffer = true; 
      context.Response.BinaryWrite(file); 
      memoryStream.Dispose(); 
     } 
     else 
     { 

     } 

當我運行代碼我可以能夠通過輸入僱員代碼來顯示的PDF爲一個僱員，但如果我進入另一個僱員代碼在文本框中，特定員工的pdf沒有被顯示。任何人都可以解決這個問題嗎？

Answer 1

你可以嘗試這樣的事情

if (reader.HasRows) 
{ 
    context.Response.Clear(); 
    context.Response.ContentType = "application/pdf"; 
    context.Response.TransmitFile(reader["pdfpath"].ToString()); //the path must be actual physical path of the file 
    contest.Response.End(); 
} 
else 
{ 
    context.Response.Clear(); 
    context.Response.ContentType = "text/plain"; 
    context.Response.Write("No file found"); 
    contest.Response.End(); 
}