导入Excel文件：Could not find installable ISAM

原因

1.连接字符串格式错误

如：Data Source 写成DataSource，Extended Properties 写成 ExtendedProperties，中间要有空格！

参考：

Office 2007

Provider=Microsoft.ACE.OLEDB.12.0;Data Source={_FileName};Extended Properties='Excel 8.0;HDR=YES;IMEX=1';Mode=ReadWrite;Persist Security Info=False;

Office 2010+

Provider=Microsoft.ACE.OLEDB.12.0;Data Source={_FileName};Extended Properties='Excel 12.0;HDR=YES;IMEX=1';Mode=ReadWrite;Persist Security Info=False;

2.没有安装ACE驱动

Microsoft ACE：AccessDatabaseEngine 下载地址：

https://www.microsoft.com/en-us/download/confirmation.aspx?id=13255