How do i...instead of creating new object everytime I want to use already existing created object for accessing in C#

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Instead of creating new object everytime i want to use already existing created object for accessing in C#

What I have tried:

C#

Instead of creating new object everytime i want to use already existing created object for accessing in C#

C#

if (obj1== null)
			{
				obj1= new obj1();
			}

Posted 9-Nov-16 0:22am

NManikantan912

Updated 9-Nov-16 1:50am

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CPallini · Answer 1 · 2016-11-09T00:27:00

Solution 1

Well, no one prevents you in doing that. If your variable holds a valid reference to an object then use it. On the other hand, if your variable holds just null then you have to create an instance of the class (using the proper syntax, of course).

Posted 9-Nov-16 0:27am

CPallini

Midi_Mick · Answer 2 · 2016-11-09T01:50:00

It's a very common pattern called a singleton, where there is only ever one instance of an object created. Google "Singleton pattern", and you'll find lots of stuff about it, but the basic formula is what you have there.

C#

class MyClass {
    private MyClass();
    private static MyClass _instance = null;

    public static MyClass TheInstance {
        get {
            if (_instance == null)
                _instance = new MyClass();
            return _instance;
        }
    }
    ...
}

// Then when you want to use it:
MyClass.TheInstance.SomeMethod();
var value = MyClass.TheInstance.SomeProperty;