#295 – When Is a Static Constructor Called?

You cannot dictate when a static constructor will be called and you can’t call it directly.

More specifically, a static constructor will be called just before you do one of the following:

  • Create an instance of the type
  • Access any static data in the type
  • Start executing Main method (in the same class as the static constructor)

If we have the following implementation in the Dog class:

        public Dog(string name)
        {
            Console.WriteLine("Dog constructor");
            Name = name;
        }

        public static string Motto = "Wag all the time";

        static Dog()
        {
            Console.WriteLine("Static Dog constructor");
        }

And we create a Dog instance:

 Console.WriteLine("Here 1");
 Dog d1 = new Dog("Kirby");
 Console.WriteLine("Here 2");

We get this output (static constructor called before object instantiation):

Or if we access static data:

            Console.WriteLine("Here 1");
            string s = Dog.Motto;
            Console.WriteLine("Here 2");

The output is (static constructor called before accessing static data):

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About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

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