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”