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C# static field
2018-08-01 07:03:49

C# static field

In C#, static filed is the one which belongs to the class not instance hence we don’t need to create instance to access static field. The memory is assigned only once to a static field at the time of class loading which is common among all the objects.

Advantages:
  1. We don't need to create object to access static data that's why it is memory efficient.
  2. The data which is common among all the objects is made static to avoid redundancy of data.
Static Filed: A filed that is declared static is called static filed. Static field gets memory only once at the time of class loading. The common property among all the objects is referred by static field such as company name in case of employees, college name in case of students.

C# Static Filed Example: Let's see a simple example of static field in C#. 
using System;
public class Student
{
            int id;
            string course,name;
            static int batch=2017;
            public Student(int id,string name,string course)
            {
                        this.id=id;
                        this.name=name;
                        this.course=course;
            }
            public void show()
            {
                        Console.WriteLine(id+" "+name+" "+course+" "+batch);
            }
            public static void Main(string[] args)
            {
                        Student s1=new Student(101,"Ravi Dubey","M.C.A.");
                        Student s2=new Student(102,"Ravi Malik","B. Tech.");
                        s1.show();
                        s2.show();
            }
}
Output 
101 Ravi Dubey M.C.A. 2017
102 Ravi Malik B. Tech. 2017
C# Static field Example: Counting Number of instances 
using System;
public class Student
{
            int id;
            string course,name;
            static int batch=2017;
            static int count=0;
            public Student(int id,string name,string course)
            {
                        this.id=id;
                        this.name=name;
                        this.course=course;
                        count++;
            }
            public void show()
            {
                        Console.WriteLine(id+" "+name+" "+course+" "+batch);
            }
            public static void Main(string[] args)
            {
                        Student s1=new Student(101,"Ravi Dubey","M.C.A.");
                        Student s2=new Student(102,"Ravi Malik","B. Tech.");
                        Student s3=new Student(103,"Ravi Gautam","B.C.A.");
                        s1.show();
                        s2.show();
                        s3.show();
                        Console.WriteLine("Number of students are : "+count);
            }
}
Output 
101 Ravi Dubey M.C.A. 2017
102 Ravi Malik B. Tech. 2017
103 Ravi Gautam B.C.A. 2017
Number of students are : 3