October 17, 2021

Programmingempire

Today I will explain a Static Class Example in C#. To begin with, let us first understand what is a static class.

Static Class in C#

Basically, a static class in C# is a class, which can’t be instantiated. Therefore, the purpose of creating a static class is to define methods that can’t be associated with any object. Whenever we create a static class in a program, the compiler makes sure that the programmer doesn’t create an object of this class. Further, a static class can have static fields, static constructor, and static methods. In general, it can’t contain any instance member.

Program Demonstrating a Static Class Example in C#

The following program shows how to create a static class in C#. Also, the static class that we create in this example contains several static members. Accordingly, it contains a static constructor and two static methods.

Since the purpose of defining the class ImportantFunctions is just to create two functions, we should create this class as a static class. This class provides the function to compute factorial, and to compute the simple interest. Hence, the class doesn’t have any attributes and behavior. Moreover, objects are real-life entities that possess properties and have a behavior. Hence, we can’t create any object of the class ImportantFunctions.

Further, the static constructor present in this class just demonstrates how to create a static constructor. It also shows, when the compiler calls a static constructor. In fact, the compiler calls the static constructor implicitly when the program execution starts. Also, in the Main() method, if we create an object of this class, it will result in a compile error. The two static functions can be called by using the class name, and the dot operator.

using System;
namespace StaticClassDemo2
{
    class Program
    {
        static void Main(string[] args)
        {
            //  ImportantFunctions ob = new ImportantFunctions();

            int f = ImportantFunctions.Factorial(12);
            Console.WriteLine("Factorial =" + f);

            double si = ImportantFunctions.FindSimpleInterest(3500, 6.9, 3);
            Console.WriteLine("Simple Interest = " + si);
        }


        static class ImportantFunctions
        {
            static ImportantFunctions()
            {
                Console.WriteLine("Inside Static Constructor");
            }

            public static int Factorial(int n)
            {
                    int fact = 1;
                    if (n == 0) return 1;
                    for(int i=1;i<=n;i++)
                    {
                        fact = fact * i;
                    }
                    return fact;
            }

            public static double FindSimpleInterest(double p, double r, double t)
            {
                double si = (p * r * t) / 100.0;
                return si;
            }
        }
    }
}

Output

Programmingempire

Static Class in C#

Program Demonstrating a Static Class Example in C#

Further Reading

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