using constructor

Question

how to restrict class from creating object using constructor

Tapan Patel · Answer

if not misunderstood, you are looking at singleton design pattern where you need only one object throughout the application. below could be one of the possible implementations if that's what you are looking for (also not that, this is not thread-safe.) Having private constructor will not allow other classes to create an object. class TestPvtConstructior { private static TestPvtConstructior _pvtmemeber; private TestPvtConstructior() { } public static TestPvtConstructior GetInstance() { if (_pvtmemeber== null ) { _pvtmemeber = new TestPvtConstructior(); } return _pvtmemeber; } } And in your main method you can get only one object by doing: var instance = TestPvtConstructior.GetInstance();

Ankit Sahu · Answer

By using Private constructor restrict class object to create Because it inaccessible due to it protection level. Private access is the least permissive access level. Private members are accessible only within the body of the class or the struct in which they are declared. using System; namespace ConsoleApplication1 { public class UsersData { private UsersData() { } } class Program { static void Main(string[] args) { UsersData users = new UsersData(); Console.ReadKey(); } } } Compile time Error :- If you define public constructor It’s accessible everywhere in your project . using System; namespace ConsoleApplication1 { public class UsersData { public UsersData() { } } class Program { static void Main(string[] args) { UsersData users = new UsersData(); Console.ReadKey(); } } } Build Successfully.

Ravi Patel · Answer

Hi, If we declare a private constructor then you can not create object outside of this class but you can create object in same class where you created a private constructor. there is no other way to restrict the object creation by using constructor. alternate way make a class as Abstract Static Class