How to create a single instance of class

Question

How to make single instance of class and how to use in all the modules

Mageshwaran R · Answer

Hi, public sealed class Singleton { public static readonly Singleton instance = new Singleton(); private Singleton() {} }

Vinay Singh · Answer

Hi Please report it to the write of the article :-) :-)

ketan borsdiya · Answer

Hi Rafnas, I dont think so NameOfClass obj=new NameOfClass(); is to possible create global instance. for single instance of class you might have to use singleton pattern. Prefer below code public class Test { Private Test() { } static Test _testInstance; public static Test TestInstance { get { if _testInstance;== null) { lock (_lock) { if _testInstance;== null) { _testInstance;= new Test(); } } } return _testInstance; } } Public int Add(int a, int b) { return a+b; } //Add here Methods or Members whatever you want required } Now you have to access Add method in your project write below sentence Test.TestInstance.Add(10,20);

ketan borsdiya · Answer

Hi Vinay, as per you provide details about static class and singleton class is wrong. Because static class has only one static constructor and also I think we are not creating object of singleton class bacause singleton class means object itself. I suggest code to Rafnas is singleton class pattern singleton class has private constructor. So, we are not able to create object of that class.

Vinay Singh · Answer

Check the link http://csharpindepth.com/Articles/General/Singleton.aspx https://msdn.microsoft.com/en-us/library/ff650316.aspx http://www.dotnetperls.com/singleton

Vinay Singh · Answer

Hi Yes i am agree with you. but it's not the way to use singleton.

Rafnas T P · Answer

I wanted to create one instance of class like for ex, NameOfClass obj=new NameOfClass(); and then I want this obj to use it in every window or pages, can you tell me how it is possible

ketan borsdiya · Answer

Hi Vinay, I know, we are not able to create instance of static class. But We are creating Instance property of Normal class so its allow the static. I am not sayin to put static keyword before class name. I have already used it and its working fine.

Vinay Singh · Answer

Hi Ketan There is huge difference between Static class and singleton have a look of the difference. Static Class: You cannot create the instance of static class. Loaded automatically by the .NET Framework common language runtime (CLR) when the program or namespace containing the class is loaded. Static Class cannot have constructor. We cannot pass the static class to method. We cannot inherit Static class to another Static class in C#. Singleton: You can create one instance of the object and reuse it. Singleton instance is created for the first time when the user requested. Singleton class can have constructor. You can create the object of singleton class and pass it to method. Singleton class does not say any restriction of Inheritance. We can dispose the objects of a singleton class but not of static class. For detail check the link http://www.dotnetperls.com/singleton-static http://www.c-sharpcorner.com/UploadFile/akkiraju/singleton-vs-static-classes/

ketan borsdiya · Answer

Hi Rafnas, Write below property in static _test; public static Test { get { if _test;== null) { lock (_lock) { if _test;== null) { _test;= new (); } } } return _test; } } Now you may use Test as class instance in your project like .Test.

Vinay Singh · Answer

Hi By using singleton pattern of of c#. you can create single instance of class http://csharpindepth.com/Articles/General/Singleton.aspx https://msdn.microsoft.com/en-us/library/ff650316.aspx http://www.dotnetperls.com/singleton

How to create a single instance of class

Answers (11)