The strategy mode of behavioral design pattern

Structure
Intention	Define a series of algorithms, encapsulate them one by one, and make them interchangeable with each other. This mode allows the algorithm to be independent of the customers who use it.
Applicability	Many of the related classes are simply behavior-specific. Policy provides a way to configure a class with one behavior in multiple behaviors. You need to use different variants of an algorithm. For example, you might define algorithms that reflect different spatial/temporal tradeoffs. When these variants are implemented as a class hierarchy of an algorithm [H O 8 7], the policy mode can be used. The algorithm uses data that the customer should not know about. You can use the policy mode to avoid exposing complex, algorithmic-related data structures. A class defines a variety of behaviors, and these behaviors appear as multiple conditional statements in the operation of this class. The related conditional branches are moved into their respective s t r a t e G y classes in place of these conditional statements.

1 usingSystem;2 3     4     Abstract classStrategy5     {6         Abstract  Public voiddoalgorithm ();7     }8 9     classFirststrategy:strategyTen     { One         Override  Public voidDoalgorithm () A         { -Console.WriteLine ("In first strategy");  -         } the     } -  -     classSecondstrategy:strategy -     { +         Override  Public voidDoalgorithm () -         { +Console.WriteLine ("In second strategy");  A         } at     } -  -     classContext -     { - strategy S; -          PublicContext (Strategy strat) in         { -s =Strat;  to         } +  -          Public voidDoWork () the         { *             //some of the context ' s own code goes here $         }Panax Notoginseng  -          Public voiddostrategywork () the         { +             //Now we can hand off to the strategy to do some A             // More work the s.doalgorithm (); +         } -     } $  $     /// <summary> -     ///Summary description for Client. -     /// </summary> the      Public classClient -     {Wuyi          Public Static intMain (string[] args) the         {     -Firststrategy Firststrategy =Newfirststrategy (); WuContext C =NewContext (firststrategy); - c.dowork (); About c.dostrategywork (); $  -             return 0; -         } -}

Policy Mode

The strategy mode of behavioral design pattern