SqlConnection 类不是数据库连接的基类；其目的是连接到 MS SQL Server DB.你想要的是一个基本的 OleDbConnection 或 OdbcConnection；如果您的 MySql 实例支持，我会使用 OleDb.

The SqlConnection class is not the base class for a DB connection; its purpose is to connect to MS SQL Server DBs. What you want is a basic OleDbConnection or OdbcConnection; I would use OleDb if your MySql instance supports it.