#637 – A Delegate Can Refer to A Partial Method

You can have a delegate refer to a partial method, but only if the partial method is implemented.  At compile-time, if a delegate points to a partial method and you’re compiling only the declaration of the partial method, but not an implementation, you’ll get a compiler error.

    // Dog-1.cs
    public partial class Dog
    {
        // Action is a delegate type in System that takes
        //   no parameters and returns a void
        Action barkDelegate;

        public Dog()
        {
            // Point delegate to partial method Bark.
            barkDelegate = Bark;
        }

        public void BarkViaDelegate()
        {
            barkDelegate();
        }

        // Partial method declaration--no implementation here
        partial void Bark();
    }
    // Dog-2.cs
    public partial class Dog
    {
        // Implementation of Bark
        partial void Bark()
        {
            Console.WriteLine("Woof!");
        }
    }
        static void Main()
        {
            Dog d = new Dog();
            d.BarkViaDelegate();
        }

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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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