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(); }}
