Singleton classes in Objective-C vs C#?

Question

I'm used to Objective-C and so I know that to create a singleton method all I do is this:

+ (void)myMethod

and to call it I type

#import MyClass;
[MyClass myMethod];

How do I do the same thing in C#?

That's not a singleton in objective-c, that's a class method. — bryanmac, Dec 10 '11 at 02:04
possible duplicate of [What is a singleton in C#?](http://stackoverflow.com/questions/2155688/what-is-a-singleton-in-c) — bryanmac, Dec 10 '11 at 02:06
The `+` indicates that it's a class method (vs an instance method). — Hot Licks, Dec 10 '11 at 02:09
the + is a class method. Here's one way to do an objective-c singleton http://stackoverflow.com/questions/5381085/how-to-create-singleton-class-in-objective-c — bryanmac, Dec 10 '11 at 02:09
http://stackoverflow.com/questions/1053592/objective-c-class-vs-instance-methods — bryanmac, Dec 10 '11 at 02:10
(A class method is essentially the same as a "static method", though the Objective-C purists will scream that there's no resemblance.) — Hot Licks, Dec 10 '11 at 02:11
a singleton has a class or static method which always returns the same instance of the object - usually with some synchronization for thread safety. — bryanmac, Dec 10 '11 at 02:11
As Hot Licks pointed out a static C# function is *similar* to a class method. As for the C# singleton, see the possible duplicate I linked. — bryanmac, Dec 10 '11 at 02:14

score 1 · Answer 1 · answered Dec 10 '11 at 02:03

1

Here is the closest thing to your code in C# (it is not exactly the same, because in Objective-C you can "override" static methods, but in C# you cannot).

class MyClass {
    static public void MyMethod() {
        // Do something
    }
}

public class Program {
    public static void Main(string[] args) {
        MyClass.MyMethod();
    }
}

answered Dec 10 '11 at 02:03

Sergey Kalinichenko

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@dtb Now it should compile (I added an empty body to the method). – Sergey Kalinichenko Dec 10 '11 at 02:05
@bryanmac I know, but the OP asked to translate Objective C to C#, that's what I did. – Sergey Kalinichenko Dec 10 '11 at 02:09
OK - I didn't down vote - I simply clarified ... I realized you answered the exact question :\ – bryanmac Dec 10 '11 at 02:17

score 0 · Answer 2 · answered Dec 10 '11 at 09:48

I don't really understand from this debate what you really need. Here is the singleton pattern in C#:

public class MyClass
{
    private static MyClass instance;

    private MyClass()
    {
    }

    public static GetInstance()
    {
        if(instance == null)
            instance = new MyClass();
        return instance;
    }
}

Singleton classes in Objective-C vs C#?

2 Answers2