What is difference between Private and static Constructor??

Priyanka Singh

6y1.2kVisual Basic .NET

Why we need constructors in our program??What is difference between private and static constructors??

7 Replies

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Rajeev Kumar3y ago
Hi Priyanka

Static constructor is called before the first instance of class is created, wheras private constructor is called after the first instance of class is created. 2. Static constructor will be executed only once, whereas private constructor is executed everytime, whenever it is called.
0
Rajanikant Hawaldar6y ago
Need of constructor is to initialize the object of a class. Allow to constructor overloading, allow to change access modifiers.
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Farhan Ahmed6y ago
https://www.c-sharpcorner.com/article/different-types-of-constructor-in-c-sharp/
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Mageshwaran R6y ago
Hi Priyanka,

Private constructors are still instance constructors - they are not static. They're no different from public constructors, except they define who can call them, just like the difference between a public and private regular method.
Some possible use cases for a private constructor would be for singletons, a private constructor whose functionality is shared by multiple public constructors, or using static methods to build your class instead of constructors.
Example:
public class Bar {
     private Bar() { }
     private static readonly Bar _instance = new Bar();
     public static Bar GetInstance() { return _bar; }
}

public class Baz {
    private string _msg;
    private Baz(string msg) { // Not accessible publicly
        _msg = msg;
    }

    // These two are accessible publicly, and both call
    // the private constructor
    public Baz(int i) : this(i + " is an integer") { }
    public Baz(decimal d) : this(d + " is a decimal") { }
}

public class Foo {
    private Foo() { // Not accessible publicly
    }
    public static Foo CreateFoo() {
        // Do some stuff here that you can't normally do in a constructor.
        return new Foo();
    }
}
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Rajanikant Hawaldar6y ago
Hello Priyank,

They are not same in execution:A static constructor is called before the first instance is created. So its kind of global initializer. Whereas Private constructor is called after the instance of the class is created. Inheritance-wise both are same.There is difference between the two.Static constructor will be called first time when the class is referenced. A static constructor is used to initialize static members of the class. In the non static class the private or public constructor will not be called. Static members will not be initialized either by the private or public constructor. This concept can be understood by the following example.
using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace OOPConcepts

{

   class Program

   {

       static void Main(string[] args)

       {

           OnlyOne.SetMyName("I m the only one."); //static constructor will be called first time when the class will be referenced.

           Console.WriteLine(OnlyOne.GetMyName());

           NoInstance.SetMyName("I have private constructor"); //No constructor will be called when the class will be referenced

           Console.WriteLine(NoInstance.GetMyName());

           Console.Read();

      }

   }

   static class OnlyOne

  {

       static string name;// This will be called first time when even the class will be referenced.

      static OnlyOne()

     {

         name = string.Empty;

         Console.WriteLine("Static constructor is called");

     }

     public static string GetMyName()

     {

          return name;

     }

     public static void SetMyName(string newName)

     {

         name = newName;

     }

}

public class NoInstance

{

   static string name;

   private NoInstance()

   {

      name = string.Empty;

      Console.WriteLine("No instance private constructor is called");

   }

   public static string GetMyName()

   {

       return name;

   }

   public static void SetMyName(string newName)

   {

      name = newName;

   }

}

}
+1
Hiten Pandya6y ago
Hi Priyanka Singh,

I think you should take a look at below forum discussions and you will get to know what is the exact differece.

Note : Pay attention on question asked in stackoverflow. That person has explained very well and I think he covers every main point.

https://stackoverflow.com/questions/30331957/what-is-the-main-difference-between-a-static-constructor-and-private-constructor#:~:text=A%20static%20constructor%20cannot%20access,first%20instance%20of%20a%20class.&text=However%2C%20Private%20Constructor%20is%20used,class%20contains%20only%20static%20members.

https://www.c-sharpcorner.com/interview-question/what-is-difference-between-private-and-static-constructor

Hope you find this helpful

Thanks
+2
Vikas Jha6y ago
On your first question , you can refer this below link, it is nicely explained.
https://www.w3schools.com/cs/cs_constructors.asp
https://www.c-sharpcorner.com/UploadFile/0c1bb2/constructors-and-its-types-in-C-Sharp/

On private constructor and Public Constructor
https://www.tutlane.com/tutorial/csharp/csharp-private-constructor-with-examples
https://www.c-sharpcorner.com/blogs/private-constructor-in-c-sharp
https://www.dotnetperls.com/constructor

Going through these links will help you understand better.
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