用命令模式实现限制用户角色的行为

命令模式的一个好处是容易管理行为的权限,由于行为被封装为命令对象,因些可以使用命令与角色的权限对应,在命令执行时判断是否符合权限,进而实现对行为的安全控制


public abstract class Command




...{


public Command()




...{


}




public abstract void Execute();


}




public class InsertCommand:Command




...{


public override void Execute()




...{


MessageBox.Show("Insert Comand Execute");


}




}




public class UpdateCommand:Command




...{


public override void Execute()




...{


MessageBox.Show("Update Command Execute");


}




}




public class DeleteCommand:Command




...{


public override void Execute()




...{


MessageBox.Show("Delete Command Execute");


}




}




public class SecurityCommand:Command




...{


private Command c;




public SecurityCommand(Command c)




...{


this.c=c;


}




public override void Execute()




...{


MessageBox.Show("在这里加入权限判断");


c.Execute();


}


}