static void Main(string[] args)
{
#region 未使用简单工厂，则需要手动创建类
var result = string.Empty;
DatabaseConnection conn;
conn = new MySqConnection();
result = conn.GetDatabaseConnection();
Console.WriteLine(result);
conn = new SqlServerConnection();
result = conn.GetDatabaseConnection();
Console.WriteLine(result);
#endregion
#region 简单工厂模式写法
var factory = DatabaseSourceFactory.GetDatabaseConnection("Mysql");
result = factory.GetDatabaseConnection();
Console.WriteLine(result);
#endregion
Console.ReadKey();
}