#651 – Passing an Anonymously-Typed Object to a Method

An anonymous type is a temporary data type that is inferred based on the data that you include in an object initializer.

var movie = new { Title = "North By Northwest", Year = 1959, Director = "Alfred Hitchcock" };

You normally can’t pass this object to a method because there is no explicit type for the object and you cannot define an implicitly-typed parameter for a method.

However, you can use a dynamically-typed parameter (dynamic keyword) to pass the anonymously-typed object to a method.

    public static class MovieUtility
    {
        public static void DumpFromAnonType(dynamic anonType)
        {
            Console.WriteLine("Title = {0}", anonType.Title);
        }
    }

 

            var movie = new { Title = "North By Northwest", Year = 1959, Director = "Alfred Hitchcock" };
            MovieUtility.DumpFromAnonType(movie);

This code will compile and will execute properly if run. Passing an object that doesn’t have a Title property to the method will result in a run-time error.

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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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