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”