問題閱讀excel表

Question

SqlDataReader reader; 
string r=""; 
if ((FileUpload1.PostedFile != null)&&(FileUpload1.PostedFile.ContentLength > 0)) 
{ 
    r = System.IO.Path.GetFullPath(FileUpload1.PostedFile.FileName); 
} 
OleDbConnection oconn = 
    new OleDbConnection 
    (@"Provider=Microsoft.Jet.OLEDB.4.0;" 
    + @"Data Source="+r+";" 
    + @"Extended Properties=""Excel 8.0;HDR=Yes;"""); 
oconn.Open(); 
OleDbCommand dbcom = new OleDbCommand("SELECT * FROM [Sheet1$]", oconn); 
OleDbDataReader dbreader = dbcom.ExecuteReader(); 
int rni = dbreader.GetOrdinal ("RollNo"); 
int mki = dbreader.GetOrdinal ("marks"); 

這裏程序只有在項目文件夾中存在excel工作表。如果對Excel工作表進行了任何更改，然後程序再次運行，那麼只有之前存在的行被提取，而不是稍後添加的那些。請幫我.....在此先感謝.....

Answer 1

嗨請張貼的完整代碼，或者你可以導入整個工作表的DataTable對象與下面的方法和檢索數據表所需的列和行

static public DataTable ExecuteOleDataTable(string sql, string oledbconnectionstring) 
    { 
     using (OleDbCommand command = new OleDbCommand()) 
     { 
      command.CommandType = CommandType.Text; 

      OleDbConnection oledbconnection = new OleDbConnection(oledbconnectionstring); 
      command.Connection = new OleDbConnection(oledbconnectionstring); ; 
      command.CommandText = sql; 

      if (oledbconnection.State == System.Data.ConnectionState.Open) 
       oledbconnection.Close(); 
      oledbconnection.Open(); 
      OleDbDataAdapter sda = new OleDbDataAdapter(command); 
      DataTable datatable = new DataTable(); 
      sda.Fill(datatable); 
      oledbconnection.Close(); 
      return datatable; 
     } 
    }