C # overriding IComparer interface

First define the comparison class inherits from Icomparer<racer>

1  Public classRacercomparer:icomparer<racer>2     {3          Public enumComparetype4         {5 FirstName, LastName, country, Wins6         }7         PrivateComparetype Comparetype;8          Publicracercomparer (comparetype comparetype)9         {Ten              This. Comparetype =Comparetype; One         } A          Public intCompare (Racer x, Racer y) -         { -             if(x = =NULL&& y = =NULL)return 0; the             if(x = =NULL)return-1; -             if(Y = =NULL)return 1; -  -             intresult; +             Switch(Comparetype) -             { +                  CaseComparetype.firstname: A                     return string. Compare (X.firstname, y.firstname); at                  CaseComparetype.lastname: -                     return string. Compare (X.lastname, y.lastname); -                  CaseComparetype.country: -result =string. Compare (X.country, y.country); -                     if(Result = =0) -                         return string. Compare (X.lastname, y.lastname); in                     Else -                         returnresult; to                  CaseComparetype.wins: +                     returnX.wins.compareto (y.wins); -                 default: the                     Throw NewArgumentException ("Invalid Compare Type"); *             } $         }Panax Notoginseng}

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1 classRacer:icomparable<racer>2     {3          Public intId {Get;Private Set; }4          Public stringFirstName {Get;Set; }5          Public stringLastName {Get;Set; }6          Public stringCountry {Get;Set; }7          Public intWins {Get;Set; }8          Public Override stringToString ()9         {Ten             returnString.Format ("{0} {1}", FirstName, LastName); One         } A          PublicRacer (intIdstringFirstName,stringLastName,stringcountry) -: This(ID, FirstName, lastName, country, wins:0) -         { the         } -          PublicRacer (intIdstringFirstName,stringLastName,stringCountry,intwins) -         { -              This. Id =ID; +              This. FirstName =FirstName; -              This. LastName =LastName; +              This. Country =Country; A              This. Wins =wins; at         } -          Public intCompareTo (Racer other) -         { -             if(Other = =NULL)return-1; -             intCompare =string. Compare ( This. LastName, other. LastName); -             if(Compare = =0) in                 return string. Compare ( This. FirstName, other. FirstName); -             returnCompare; to         } +}

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Call comparison method

1  varGraham =NewRacer (7,"Graham","Hill","UK", -);2             varEmerson =NewRacer ( -,"Emerson","Fittipaldi","Brazil", -);3             varMario =NewRacer ( -,"Mario","Andretti","USA", A);4 5             varRacers =NewList<racer> ( -) {Graham, Emerson, Mario};6Racers. Sort (NewRacercomparer (RacerComparer.CompareType.Country));

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C # overriding IComparer interface