读取Excel异常定义了过多字段的解决方法

  /// <summary>
       /// 从Excel文件导入数据
     /// </summary>
       /// <param name="ExcelStr">文件的全路径</param>
       /// <param name="SheetName">Excel文档里的表名称</param>
       public static DataSet Class_ExcelSql(string ExcelStr, string SheetName)
       {
           OleDbConnection MyConn_E = new OleDbConnection();
           OleDbCommand MyComm_E = new OleDbCommand();
           OleDbDataAdapter MyAdap = new OleDbDataAdapter();
           DataSet MyTable = new DataSet();
           if (!File.Exists(ExcelStr))
           {
               DevExpress.XtraEditors.XtraMessageBox.Show("所选文件不存在！", "提示");
               return null;
           }
           string Conn_Str = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + ExcelStr + ";Extended Properties='Excel 8.0;HDR=Yes;'";
           try
           {
               MyConn_E.ConnectionString = Conn_Str;
               MyConn_E.Open();
               MyComm_E.Connection = MyConn_E;
               MyComm_E.CommandText = "select * from [" + SheetName + "$]";
               MyAdap.SelectCommand = MyComm_E;
               MyAdap.Fill(MyTable);
           }
           catch (OleDbException Err_My)
           {
               DevExpress.XtraEditors.XtraMessageBox.Show(Err_My.Message, "提示");
           }
           if (MyConn_E.State == ConnectionState.Open)
           {
               MyConn_E.Close();
               MyConn_E.Dispose();
           }
           MyComm_E.Dispose();
           MyAdap.Dispose();
           return MyTable;
       }  

其中MyComm_E.CommandText = "select * from [" + SheetName + "$]";抛出异常“"定义了过多字段"”

此问题可以有三种解决办法

办法一：隐藏Excel多余的列开始-格式-隐藏和取消隐藏-选择隐藏列

办法二：把查询语句改为指定开始到结束列

如："select * from [" + SheetName + "$A:IU]";其中A:IU代表查询第A列到第IU列。

办法三：查询指定列

如："select 第一列，第二列 from [" + SheetName + "$]";。

以上三种方法都可以解决“定义了过多字段”