About Inheritance

Question

What is multiple inheritance in C# with example

Santhosh Kumar · Answer

Generally, Multiple inheritance is a class that can be derived from more than one class , which means that it can inherit data and functions from multiple base classes. Because C# does not support multiple inheritance, it uses interface. So multiple inheritance in c# can be done by interfaces. Example of interface in C# (mutliple inheritance) : using System ; namespace InheritanceApplication { class Shape { public void setWidth ( int w ) { width = w ; } public void setHeight ( int h ) { height = h ; } protected int width ; protected int height ; } // Base class PaintCost public interface PaintCost { int getCost ( int area ); } // Derived class class Rectangle : Shape , PaintCost { public int getArea () { return ( width * height ); } public int getCost ( int area ) { return area * 70 ; } } class RectangleTester { static void Main ( string [] args ) { Rectangle Rect = new Rectangle (); int area ; Rect . setWidth ( 5 ); Rect . setHeight ( 7 ); area = Rect . getArea (); // Print the area of the object. Console . WriteLine ( "Total area: {0}" , Rect . getArea ()); Console . WriteLine ( "Total paint cost: ${0}" , Rect . getCost ( area )); Console . ReadKey (); } } } Output: Total area: 35 Total paint cost: $2450

Bikesh Srivastava · Answer

Hi, You can not inherit multiple class at a time in a class.but interfaces can, due to ambiguity problem in c#

Mayank · Answer

Multiple inheritance causes problems, if one or more of the parent classes defines members with same identifier. You would have to decide which parent to use to handle each method call, and the operation of class can be then very different than intended. Example: using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace MultipleInheritApplication { interface calc1 { int add( int a, int b); } interface calc2 { int sub( int x, int y); } interface calc3 { int mul( int r, int s); } interface calc4 { int div( int c, int d); } class Calculation : calc1 , calc2 , calc3 , calc4 { public int result1; public int add( int a, int b) { return result1 = a + b; } public int result2; public int sub( int x, int y) { return result2 = x - y; } public int result3; public int mul( int r, int s) { return result3 = r * s; } public int result4; public int div( int c, int d) { return result4 = c / d; } class Program { static void Main( string [] args) { Calculation c = new Calculation (); c.add(8, 2); c.sub(20, 10); c.mul(5, 2); c.div(20, 10); Console .WriteLine( "Multiple Inheritance concept Using Interfaces :
 " ); Console .WriteLine( "Addition: " + c.result1); Console .WriteLine( "Substraction: " + c.result2); Console .WriteLine( "Multiplication :" + c.result3); Console .WriteLine( "Division: " + c.result4); Console .ReadKey(); } } } } If this resolve your issue then please mark as answer.

Rajeesh Menoth · Answer

Hi, C# only support Multi Level Inheritence. It doesn't allowed Multiple Inheritence. So you can achieve this task using Interface. Reference : http://www.c-sharpcorner.com/UploadFile/sekarbalag/interface-best-example-in-csharp/ https://msdn.microsoft.com/en-us/library/87d83y5b.aspx

Ravi Patel · Answer

Hi, refer this http://www.dotnetfunda.com/articles/show/1185/multiple-inheritance-in-csharp

Pramod Thakur · Answer

Hi Prem, You can not achieve multiple inheritance in C#. If you want that then you have to go with interface. Using interface you can implement multiple inheritance. For more detail you can read this article.. http://www.c-sharpcorner.com/blogs/multiple-inheritance-in-c-sharp-using-interfaces1 If you fond that this is helpful to you mark as answer. Thanks

Shubham Kumar · Answer

Hi, Prem There is no term in c# like Multiple Inheritance. Instead of multiple inheritance here we use interface take a look of given link below https://blogs.msdn.microsoft.com/csharpfaq/2004/03/07/why-doesnt-c-support-multiple-inheritance/ https://msdn.microsoft.com/en-us/library/ms173156.aspx https://www.dotnetperls.com/interface http://www.c-sharpcorner.com/blogs/multiple-inheritance-in-c-sharp-using-interfaces1