Design mode 12-command mode

Command mode: Encapsulate the request, parameterize the client with different requests, queue the request or log the request, and revoke the operation.

1 namespacedesignmodel. Command mode2 {3     Abstract classCommand4     {5         protectedexecer exe;6          PublicCommand (execer execer)7         {8              This. exe =Execer;9         }Ten         Abstract  Public voidexeccommand (); One     } A  -     classCommandone:command -     { the          PublicCommandone (Execer execer):Base(execer) {} -          Public Override voidexeccommand () -         { - exe. Execcommandone (); +         } -     } +     classCommandtwo:command A     { at          PublicCommandtwo (Execer execer):Base(execer) {} -          Public Override voidExecCommand () =exe. Execcommandtwo (); -  -     } -  -     classExecer in     { -          Public voidExeccommandone () = Console.WriteLine (""); to          Public voidExeccommandtwo () = Console.WriteLine (""); +      } -  the  *     classBuilder $     {Panax Notoginsengilist<command> list =NewList<command>(); -          PublicBuilder setbuilder (Command command) the         { + list. ADD (command); A             return  This; the         } +          Public voidRemove (Command command) -         { $ list. Remove (command); $         } -          Public voidNotify () -         { theList. All (x = {X.execcommand ();return true; }); -         }Wuyi     } the } -  Static voidCommand mode () Wu         { -Execer Execer =Newexecer (); AboutCommand C1 =NewCommandone (execer); $Command C2 =NewCommandtwo (execer); -             varBuilder =Newdesignmodel. Command mode. Builder (); - Builder. Setbuilder (C1). Setbuilder (C2). Notify (); -}

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Advantages:

1 command queue can be designed;

2 allow the command receiver to veto the command;

3 Adding a specific command class does not affect other parts.

Design mode 12-command mode