从访问中获取数据while while

Question

OleDbConnection conn = new OleDbConnection(@"Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" + Server.MapPath("App_Data\\people.mdb")); 
      string command = "SELECT * from Files where FileSubjectID=1"; //1 = newsLetters, 2 = Publications, 3 = Videos, 4 = Presentations, 5 = Brochures, 6 = Others 
      OleDbDataReader reader = null;  
      string fileType = string.Empty; 
      string fileIcon = string.Empty; 
      FileInfo file; 

      int count = 0; 

      try 
      { 
       using (conn) 
       { 
        using (OleDbCommand cmd = new OleDbCommand(command, conn)) 
        { 
         cmd.CommandType = CommandType.Text; 
         conn.Open(); 
         reader = cmd.ExecuteReader(); 

         Response.Write("bofore whil1e<br/>" + reader.HasRows + "<br/>"); 
         while (reader.Read()) 
         { 

          file = new FileInfo(reader["FileName"].ToString()); 
          fileIcon = setFileTypeIcon(file.Extension.ToLower()); 

          Response.Write(count++ + "<br/>"); 


          lblNewsLetters.InnerHtml += "<tr><td class='te_al_M'>" + 
           "<table><tr><td rowspan='2'><img src='images/icons/" + fileIcon + ".png' alt='" + fileIcon + "'/></td><td><span class='te_al_L lblFiles'>" + reader["FileName"].ToString() + "</span></td></td></tr><tr><td><input type='text' style='display:none' id='txtNewName_" + reader["FileID"].ToString() + "'/></td></tr></table></td>" + 


           "<td class='te_al_L' width='150'>" + getUserName(reader["UserID"].ToString()) + "</a></td>" + 
           "<td class='te_al_L' width='70'>" + Convert.ToDateTime(reader["FileUploadDate"].ToString()).ToShortDateString() + "</td>" + 
           "<td class='te_al_L' width='70'><a target='_blank' href='" + reader["FilePath"].ToString() + "''><img src='images/viewBtn.jpg' alt='View file' title='View file'/></a></td>" + 
           "<td class='te_al_L' width='70'><a target='_blank' href='" + reader["FilePath"].ToString() + "''><img src='images/downloadBtn.jpg' alt='Download file' title='Download file'/></a></td>"; 


          // only the uploader can change the file name 
          if (isCurrentUsercodeInFile(currentUsercode, reader["FileName"].ToString())) 
          { 
           lblNewsLetters.InnerHtml += "<td class='width_70'>" + 
            "<a id='rename_" + reader["FileID"].ToString() + "' href='javascript:renameFile(\"" + reader["FileID"].ToString() + "\");'><img src='images/renameBtn.jpg' alt='Rename file' title='Rename file'/></a>" + 
            "<a style='display:none;' id='save_" + reader["FileID"].ToString() + "' href='javascript:saveFile(\"" + reader["FilePath"].ToString() + "\" , \"" + reader["FileName"].ToString() + "\" , \"" + currentUsercode + "\" , \"" + reader["FileID"].ToString() + "\");'><img src='images/saveBtn.jpg' alt='Save file' title='Save file'/></a></td>"; 
          } 
          else 
          { 
           lblNewsLetters.InnerHtml += "<td class='width_70'>&nbsp;</td>"; 
          } 


          // only the uploader can delete the file 
          if (isCurrentUsercodeInFile(currentUsercode, reader["FileName"].ToString())) 
          { 
           lblNewsLetters.InnerHtml += "<td class='width_70'><a href='javascript:delFile(\"" + reader["FilePath"].ToString() + "\" , \"" + reader["FileName"].ToString() + "\" , \"" + currentUsercode + "\");'><img src='images/deleteBtn.jpg' alt='Delete file' title='Delete file'/></a></td></tr>"; 
          } 
          else 
          { 
           lblNewsLetters.InnerHtml += "<td class='width_70'>&nbsp;</td></tr>"; 
          } 
         } 
         Response.Write("b whil1e<br/>"); 
         conn.Close(); 
        } 
       } 
      } 
      catch (Exception ex) 
      { 
       //Response.Write(ex.Message); 
       conn.Close(); 
      } 

我有上面的代码，忽略所有的“Response.Write”和拼写，他们只是为我的测试。

我的问题是，要在本地编码工作，但不能联机。 “while（reader.Read（））”不能在线执行，我看到的是我之前的消息，而不是while循环中的消息，而不是while循环结束时的消息，而在本地我看到所有消息。

我做错了什么？我在这工作了两天。如果你需要更多的代码，请告诉需要什么，我很抱歉，如果这是问，但我没有找到解决我的问题。

Answer 1

你吞咽异常：

catch (Exception ex) 
{ 
    //Response.Write(ex.Message); 
    conn.Close(); 
} 

你是不是while循环后，看不到任何理由开始可能是其被抛出，但随后吞噬在片段上方例外。我会记录异常并分析它。它可能是沿线，你无法找到数据库中指定的文件：

file = new FileInfo(reader["FileName"].ToString());` 

因此，因此引发和失败。 从不燕子例外！至少登录到一个文件，以便确定发生了什么。