Title: Use the params keyword in C#

If you use the params keyword before an array parameter used as the last parameter in a method, then the calling code can pass any number of values for that parameter. The following code defines a ShowValues method that can take any number of string parameters.

// Display zero or more values. private void ShowValues(params string[] values) { lstValues.Items.Clear(); foreach (string value in values) { lstValues.Items.Add(value); } }

The following code shows how the example program calls ShowValues passing it 0, 3, or 5 parameters.

private void btn0_Click(object sender, EventArgs e) { ShowValues(); } private void btn3_Click(object sender, EventArgs e) { ShowValues("Red", "Green", "Blue"); } private void btn5_Click(object sender, EventArgs e) { ShowValues("Aardvark", "Bear", "Cantalope", "Dingo", "Eagle"); }

That's all there is to it.

Download the example to experiment with it and to see additional details.