#340 – Use the params Keyword to Pass a Variable Number of Arguments

When you define a method in a class, the parameters of the method normally dictate the exact number of arguments that you can pass to the method.  There are times, however, when you might want to pass a variable number of parameters to a method.

You could pass a variable number of parameters to a method by using an array.

        public void PerformCommands(string[] commandList)
        {
            foreach (string command in commandList)
                Console.WriteLine("Ok, I'm doing [{0}]", command);
        }

You’d call this method by creating a new instance of an array.

            kirby.PerformCommands(new string[] { "Sit", "Stay", "Come" });

To simplify things, you can use the params keyword in the method definition.  This allows passing the elements of the array as individual arguments.

        public void PerformCommands(params string[] commandList)

This makes calling the method a little cleaner.

            kirby.PerformCommands("Sit", "Stay", "Come", "Fetch");
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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 #340 – Use the params Keyword to Pass a Variable Number of Arguments

  1. Pingback: #511 – Rules for Using Parameter Arrays « 2,000 Things You Should Know About C#

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