Easiest way to check numbers

Question

I have a string array. What is the simplest way to check if all the elements of the array are numbers

string[] str = new string[] { "23", "25", "Ho" };

Answer 1

If you add a reference to the Microsoft.VisualBasic assembly, you can use the following one-liner:

bool isEverythingNumeric = 
    str.All(s => Microsoft.VisualBasic.Information.IsNumeric(s));

Answer 2

You can do this:

var isOnlyNumbers = str.All(s =>
    {
        double i;
        return double.TryParse(s, out i);
    });