C# | Method returning an object
In C#, a method can return any type of data including objects. In other words, methods are allowed to return objects without any compile time error.
Example 1:
// C# program to illustrate the concept // of the method returning an object using System; class Example { // Private data member private string str; // Method to set the value of str public void setdata( string s) { str = s; } // Method to display the value of str public void Display() { Console.WriteLine( "String is: " + str); } // Method that return object public Example Astr(Example ex) { // Creating object of Example Example obj = new Example(); // Adding the value of passed // an object in the current object // and adding the sum in another object obj.str = str + ex.str; // Returning the object return obj; } } // Driver Class class GFG { // Main method static void Main() { // Declaring objects of Example Example o1 = new Example(); Example o2 = new Example(); // Initialize the values to the objects o1.setdata( "Beginner" ); o2.setdata( "forBeginner" ); // Adding value of both objects // and the result will be // assigned into third object Example o3 = o1.Astr(o2); // Display the data o1.Display(); o2.Display(); o3.Display(); } } |
String is: Beginner String is: forBeginner String is: w3wiki
Explanation: In the above example, we have a class named as Example. Example class contains setdata() method which is used to set the value of str, and Display() method is used to display the value of str, and Astr() is used to add the value of passed object in current object and adding the sum in another object. In Main method, three objects o1, o2, and o3 of Example class are created. In this statement, Example o3 = o1.Astr(o2);, the value of o1 and o2 object is added and the result is assigned into o3 object.
Example 2:
// C# program to illustrate the // concept that how method returns // an object using System; class Triangle { // Data member of class int Base; int Height; // Constructor of class public Triangle( int b, int h) { Base = b; Height = h; } // Method return area of triangle public int Area() { return ((Base * Height) / 2); } // Method display the dimension of triangle public void Display() { Console.WriteLine( "\nBase of the triangle is: " + Base + "\nHeight of the triangle is: " + Height); } public Triangle newdimension( int d) { return new Triangle(Base * d, Height * d); } } class GFG { // Main method public static void Main() { // Creating and initializing object Triangle t1 = new Triangle(2, 8); // Display the dimensions and area of triangle Console.Write( "Dimensions of Triangle is: " ); t1.Display(); Console.Write( "Area of Triangle is: {0}" , t1.Area()); Console.WriteLine(); Console.WriteLine(); Triangle t2 = t1.newdimension(2); Console.Write( "New Dimensions of Triangle is: " ); t2.Display(); Console.Write( "New area of Triangle is: {0}" , t2.Area()); } } |
Dimensions of Triangle is: Base of the triangle is: 2 Height of the triangle is: 8 Area of Triangle is: 8 New Dimensions of Triangle is: Base of the triangle is: 4 Height of the triangle is: 16 New area of Triangle is: 32
Explanation: In the above example, we have a class named as the Triangle. The Triangle class contains constructor Triangle(), method Area() to find the area of the triangle, method Display() to display the dimension of the triangle, and method newdimension() to provide a new dimension of the triangle. The value of the dimension is returned by the object. Now in the Main method there are two objects named as t1 and t2. In this statement Triangle t2 = t1.newdimension(2);, the previous dimension, i.e. 2 and 8 of the triangle is enlarged by 2 and the result assigned to the t2 object.