#1,189 – Lambda Expression Can Capture Static Data

A lambda expression set within a static method can make use of a class’ static data.  If the static data changes after the lambda is defined, invoking the lambda later will reflect the new (modified) static data.

Suppose that we have a Dog.SetStaticLambda method that defines a lambda using some static data:

    public class Dog
    {
        public string Name { get; set; }

        public Dog(string name)
        {
            Name = name;
        }

        public static string DogMotto;

        private static Action myStaticLambda;

        public static void SetStaticLambda()
        {
            myStaticLambda = () => Console.WriteLine("Motto: {0}", DogMotto);
        }

        public static void InvokeStaticLambda()
        {
            myStaticLambda();
        }
    }

Below, we make use of these methods. Note that if we invoke the lambda after changing the static data, the new data is used.

            Dog.DogMotto = "Serving mankind for generations";
            Dog.SetStaticLambda();
            Dog.InvokeStaticLambda();  // Serving..

            Dog.DogMotto = "We want more treats";
            Dog.InvokeStaticLambda();  // Want more..

1189-001

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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.

One Response to #1,189 – Lambda Expression Can Capture Static Data

  1. Pingback: Dew Drop – September 24, 2014 (#1862) | Morning Dew

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