使用c＃.net将数据从excel文件导入数据库时​​出错

码：

constr = string.Format(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=""Excel 12.0 Xml;HDR=YES;""", FilePath); Econ = new OleDbConnection(constr); ExcelConn(FilePath); Econ.Open(); Query = string.Format("Select [Emp ID],[Emp Name],[Log Date],[LogTime],[Type] FROM [{0}]", "One Month Report$"); OleDbCommand Ecom = new OleDbCommand(Query, Econ); DataSet ds = new DataSet(); OleDbDataAdapter oda = new OleDbDataAdapter(Query, Econ); Econ.Close(); oda.Fill(ds); DataTable Exceldt = ds.Tables[0]; //creating object of SqlBulkCopy SqlBulkCopy objbulk = new SqlBulkCopy(conn); //assigning Destination table name objbulk.DestinationTableName = " Attendancetable"; //Mapping Table column objbulk.ColumnMappings.Add("Emp ID", "Emp ID"); objbulk.ColumnMappings.Add("Emp Name", "Emp Name"); objbulk.ColumnMappings.Add("Log Date", "Log Date"); objbulk.ColumnMappings.Add("LogTime", "LogTime"); objbulk.ColumnMappings.Add("Type", "Type"); //inserting Datatable Records to DataBase conn.Open(); objbulk.WriteToServer(Exceldt); conn.Close(); 

在打开的Excel工作表上传成功，但在closures的Excel工作表file upload过程中显示出这样的错误：

外表不符合预期的格式。