What is override in c#?

Question

For Example , What is the usage of override. public override string To String() { return String.Format("Name = {0}, Age = {1}", Name, Age); }

Joe Wilson · Answer

Thank you for your basic answer.

Anupam Singh · Answer

Override is basically used when you need to provide your own definition for existing method.

Abhishek Kumar · Answer

Hi Joe, Override is explained by below example. Taking an example of simple requirement , suppose we need to calculate area of different shapes which has different formula for calculating area. public abstract class shapes { // Abstract Method public abstract void calculateArea(); } here i have made calculate area is abstract method because derived shape class will implement it different way. here is first shape Square. public class sqaure : shapes { public float Area; public float length; public override void calculateArea() { // provide implementation Area = (length * length); Console.WriteLine("Sqaure Area : " + Area); } } our 2nd example shape is circle which has Area is being calculated by formula Pi*R*R where r is radius of circle. public class Circle : shapes { public double Area; public float radius; public const double Pi = 3.14; public override void calculateArea() { // provide implementation Area = (Pi* radius * radius); Console.WriteLine("Circle Area : " + Area); } } class Program { static void Main(string[] args) { sqaure sq = new sqaure(); sq.length=10; sq.calculateArea(); Circle c = new Circle(); c.radius = 10; c.calculateArea(); Console.ReadLine(); } } so basically Square and circle has override the abstract calculateArea method and implemented the formula to calculate the area of that particular shape. Hope this make senses.

Abhishek Jaiswal · Answer

hello! have a look at these links http://www.dotnet-tricks.com/Tutorial/csharp/U33Y020413-Understanding-virtual,-override-and-new-keyword-in-C http://www.c-sharpcorner.com/UploadFile/2072a9/method-overriding-in-C-Sharp/ :)

Joe Wilson · Answer

Thank you for your answer.

Joe Wilson · Answer

Thank you for This answer. by the way, could you please give me a few examples?

Abhishek Kumar · Answer

Hi There Joe, override is modifier which will be used when ever we want to change the method implementation in derived class for abstract or virtual methods from base class. In Above example tostring is the method which is used to convert object into string. By overriding the functionality here we are trying to format string by extending the tostring() method. Hope this will help. Abhishek

Abhay Shanker · Answer

you can also check below link http://msdn.microsoft.com/en-us/library/ebca9ah3.aspx

Lakshmanan Sethu Sankaranarayan · Answer

please refer www.dotnetpearls.com for samples