Using an array as argument for string.Format()

Question

When trying to use an array as an argument for the string.Format() method, I get the following error:

FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

The code is as follows:

place = new int[] { 1, 2, 3, 4}; infoText.text = string.Format("Player1: {0} \n Player2: {1} \n Player3: {2} \n Player4: {3}", place); 

The Array contains four values and the arguments in the String.Format() are also the same.

What causes this error?

(The infoText.text is just a regular String object)

Answer 1

You can convert int array to string array as pass it using System.Linq Select() extension method.

infoText.text = string.Format("Player1: {0} \nPlayer2: {1} \nPlayer3: {2} \nPlayer4: {3}",                                place.Select(x => x.ToString()).ToArray()); 

Edit:

In C# 6 and above, you can also able to use String Interpolation instead of using string.Format()

infoText.text = $"Player1: {place[0]}\nPlayer2: {place[1]} \nPlayer3: {place[2]} \nPlayer4: {place[3]}"; 

Check this fiddle for your reference.

Answer 2

Quick fix.

var place = new object[] { 1, 2, 3, 4 }; 

C# does not support co-variant array conversion from int[] to object[] therefor whole array is considered as object, hence this overload with a single parameter is called.