读取mdb文件

OdbcConnection、OleDbConnection均可读取mdb文件

OleDbConnection

private static void UseOleDbConnection(string filePath,string sql)
{
	var myConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;" +
				   $"Data Source={filePath};" +
				   "Persist Security Info=True;" +
				   "Jet OLEDB:Database Password=myPassword;";
	using (OleDbConnection myConnection = new OleDbConnection())
	{
		// 打开OleDb连接
		myConnection.ConnectionString = myConnectionString;
		myConnection.Open();

		// 执行查询
		OleDbCommand cmd = myConnection.CreateCommand();
		cmd.CommandText = sql;
		OleDbDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection); // 完成查询操作后关闭连接

		// 加载数据到DataTable
		DataTable myDataTable = new DataTable();
		myDataTable.Load(reader);
	}
}

OdbcConnection

private static void UseOdbcConnection(string filePath, string sql)
{
	var myConnectionString = @"Driver={Microsoft Access Driver (*.mdb)};" + $"Dbq={filePath};Uid=Admin;Pwd=;";
	using (OdbcConnection myConnection = new OdbcConnection())
	{
		// 打开OleDb连接
		myConnection.ConnectionString = myConnectionString;
		myConnection.Open();

		// 执行查询
		OdbcDataAdapter pAdapter = new OdbcDataAdapter(sql, myConnection);
		DataTable dataTable = new DataTable();
		pAdapter.Fill(dataTable);
	}
}

ODBC & Ole Db

OleDbConnection类的对象连接支持OLE DB的数据库，如Access；而OdbcConnection类的对象连接任何支持ODBC的数据库
二者的区别和联系：ODBC、OLEDB和ADO之间的关系 ，以及性能比较

示例代码

ReadMdbFileDemo

参考资料

How to connect to a MS Access file (mdb) using C#?
各版本Access连接字符串写法
OleDbConnection 类
OdbcConnection 类