Interface, the conversion relationship between parent and child classes.

Interface iperson:

Using system; <br/> namespace objectstruct <br/>{< br/> interface iperson <br/>{< br/> int age {Get; set ;} <br/> string name {Get; Set ;}< br/> string sex {Get; Set ;}< br/>}< br/>}

Base Class baseclass:

Using system; <br/> using system. collections. generic; <br/> using system. LINQ; <br/> using system. text; <br/> namespace objectstruct <br/>{< br/> class baseclass: objectstruct. iperson <br/>{< br/> Public baseclass () <br/>{</P> <p >}< br/> Public baseclass (string name, string sex, int age) <br/>{< br/> This. name = Name; <br/> This. sex = sex; <br/> This. age = age; <br/>}< br/> string name; <br/> Public string name <br/>{< br/> get {return name ;} <br/> set {name = value ;}< br/>}< br/> string sex; <br/> Public String sex <br/>{< br/> get {return sex ;}< br/> set {sex = value ;} <br/>}< br/> int age; <br/> Public int age <br/>{< br/> get {return age ;} <br/> set {age = value ;}< br/>}< br/>}

Subclass childclass:

Using system; <br/> using system. collections. generic; <br/> using system. LINQ; <br/> using system. text; <br/> namespace objectstruct <br/>{< br/> class childclass: baseclass <br/>{< br/> string grade; <br/> Public String Grade <br/>{< br/> get {return grade ;}< br/> set {grade = value ;} <br/>}< br/> Public childclass () <br/>{</P> <p >}< br/> Public childclass (string name, string sex, int age, string grade) <br/>: Base (name, sex, age) <br/>{< br/> This. grade = Grade; <br/>}</P> <p >}< br/>}

Running result: