Delegates and events in C #

Delegates and events in C #

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    /// <summary>    ///bad design.///Additional language needs to be changed in the late 3 places: Language enumeration, Switch-case, Methods/// </summary>     Public classBaddesign { Public enumLanguage {中文版, Chinese//Add other language        }         Public voidGreetpeople (stringname, Language Lang) {            Switch(lang) { CaseLanguage.English:EnglishGreeting (name);  Break;  CaseLanguage.Chinese:ChineseGreeting (name);  Break; //Add other language            }        }         Public voidEnglishgreeting (stringname) {Console.WriteLine ("Good Morning,"+name); }         Public voidChinesegreeting (stringname) {Console.WriteLine ("Good Morning,"+name); }        //Add Language Method    } /// <summary>    ///a relatively good design///Additional language needs to be changed in late 1 places: Language method/// </summary>    classGooddesign_delegate { Public voidGreetpeople (stringname, Greetingdelegate makegreeting)        {makegreeting (name); }         Public voidEnglishgreeting (stringname) {Console.WriteLine ("Good Morning,"+name); }         Public voidChinesegreeting (stringname) {Console.WriteLine ("Good Morning,"+name); }        //Add Language Method    } Public Delegate voidGreetingdelegate (stringname); classProgram {Static voidMain (string[] args) {            NewBaddesign (). Greetpeople ("NLH", Delegate_Event.BadDesign.Language.Chinese); NewBaddesign (). Greetpeople ("NLH", Delegate_Event.BadDesign.Language.English); NewGooddesign_delegate (). Greetpeople ("NLH",Newgooddesign_delegate ().            chinesegreeting); NewGooddesign_delegate (). Greetpeople ("NLH",Newgooddesign_delegate ().            englishgreeting);        Console.read (); }    }

Delegates and events in C #