C# 4.0, optional parameters and params do not work together

Question

How can i create a method that has optional parameters and params together?

static void Main(string[] args) {      TestOptional("A",C: "D", "E");//this will not build     TestOptional("A",C: "D"); //this does work , but i can only set 1 param     Console.ReadLine(); }  public static void TestOptional(string A, int B = 0, params string[] C) {     Console.WriteLine(A);     Console.WriteLine(B);     Console.WriteLine(C.Count()); }    

Answer 1

Your only option right now is to overload the TestOptional (as you had to do before C# 4). Not preferred, but it cleans up the code at the point of usage.

public static void TestOptional(string A, params string[] C) {     TestOptional(A, 0, C); }  public static void TestOptional(string A, int B, params string[] C) {     Console.WriteLine(A);     Console.WriteLine(B);     Console.WriteLine(C.Count()); } 

Answer 2

Try

TestOptional("A", C: new []{ "D", "E"});