The interface in C # declares a property, but there is no attribute in the hint "interface".

The interface definition properties in C # are as follows:

1 usingSystem;2 usingSystem.Collections.Generic;3 usingSystem.Linq;4 usingSystem.Text;5 6 namespacech08ex057 {8     Abstract  classHotdrink9    {Ten       floatMilk; One       floatSugar; A       -        Public intDrink (intx); -        Public intAddmilk (intx); the        Public intAddsugar (intx);  -  -    }     -  +       Public InterfaceIcup -   { +       intColor; A       intVolume; at       intRefill (intx); -       BOOLWash (); -  -    } -      classCupofcoffee:hotdrink,icup -     { in         intBeantype; -          to          Public intDrink (intx) +         { -Console.WriteLine ("Welcome,drink a cup of Coffee?? \ n"); the            *             returnx; $         }Panax Notoginseng  -       ... ... the } +  A  classCupoftea:hotdrink,icup the     { +         intLeaftype; -          $          Public intDrink (intx) $         { -Console.WriteLine ("Welcome,drink a cup of Tea?? \ n"); -            the             returnx; -         }Wuyi  the       ... ... - } Wu  -     class Program About   { $       Static voidMain (string[] args) -       { -  -Cupofcoffee coffee=NewCupofcoffee (); ACoffee.drink (2); +          ... the  -       } $  the  the  the   } the  -  in}

The above code hints error:

Lines 21st and 22nd,Interfaces cannot contain fields.

The interface in C # declares a property, but there is no attribute in the hint "interface".