What is the use of private constructor in C#

Question

If we declare private modifier in front of the class constructor and we place break point to that constructor and run the program can we inspect that break point at run time? Yes Or NO If Yes Then How? and If NO then What is the reason?

Biswa Pujarini Mohapatra · Answer

Basically you can not instantiate the class if the constructor is private Then you need to create a method/property to instantiate the class in that case when you will insatiate the class private constructor get fired and breakpoint hits. see the example below public class SingletonDemo { private static volatile SingletonDemo instance = null; private SingletonDemo() { } public static SingletonDemo getInstance() { if (instance == null) instance = new SingletonDemo(); return instance; } } using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { SingletonDemo.getInstance(); } } } keep breakpoint in the constructor and see it will hit

sathish · Answer

Private Constructor is a special instance constructor used in class that contains static memory only. public class Sample { public string param1 param2; public Sample( string a string b) { param1 = a; param2 = b; } private Sample() { Console .WriteLine( Private Constructor with no prameters ); } } class Program { static void Main( string [] args) { Sample obj = new Sample ( Hello  World ); Console .WriteLine(obj.param1 +   + obj.param2); Console .ReadLine(); } } }

Ravi Chandra Yadav · Answer

We can use one of the overloads of Activator.CreateInstance to create the instance of class class Program { public static void Main(string[] args) { Type type = typeof(Foo); Foo f = (Foo)Activator.CreateInstance(type true); f.Show(); Console.WriteLine(ravi); } } class Foo { private Foo() { } public void Show() { Console.WriteLine(Private Class); } }

Mahesh Guttedar · Answer

If i put break point infront Private cons. Debugger will not hit.

Pranay Rana · Answer

Private constructors are used to prevent creating instances of a class when there are no instance fields or methods or when a method is called to obtain an instance of a class. Generally they are used in singleton design patterns where the code ensures that only one instance of a class can ever be created. http://en.m.wikipedia.org/wiki/Singleton_pattern

Vulpes · Answer

If by 'class constructor' you mean a static constructor then you're not allowed to put any access modifier in front of it even though it's implicitly private. If you try to do so you'll get a compiler error. However if you mean an instance constructor then the answer to your question is YES. The Visual Studio debugger can follow the execution of the code at run time through any method property or constructor whether it's declared private or not. If you try this simple program place a break-point on the highlighted line and hover your mouse over the 'i' variable when execution is paused you'll see that it has a value of 3: using System; namespace ConsoleApplication1 { class MyClass { public readonly int I; public static MyClass Create(int i) { return new MyClass(i); } private MyClass(int i) { I = i; Console.WriteLine(Instance created with I = {0} i); } } class Program { static void Main(string[] args) { MyClass.Create(3); Console.ReadKey(); } } }

Avinash Aher · Answer

If i am putting break point in front of Private Constructor and run the program Is the program control hitting to break point?

Priti Kumari · Answer

Please Refer This link:Its help you to understand the usage of private constructor. http://www.dotnetperls.com/private-constructor http://www.aspdotnet-suresh.com/2013/09/csharp-constructor-example-types-of-constructor-in-csharp.html http://www.wiziq.com/tutorial/158418-c-interview-questions-What-is-the-use-of-private-constructor http://www.codeproject.com/Questions/668006/What-is-the-use-of-a-Private-Constructors-in-Cshar