String - IsLetterOrDigit

Indicates whether the character at the specified position in a specified string is categorized as a letter or a decimal digit.

Try it

public static void Main()
{
    string input = ".NET 4.7.2";

    Console.WriteLine("Is each of the following characters a letter or digit?");

    for (int i = 0; i < input.Length; i++)
    {
		// C# Extension Method: String - IsLetterOrDigit
		var result = input.IsLetterOrDigit(i);
		
        Console.WriteLine("input[{0}] = {1} ", i, result);
    }
}

View Source

using System;

public static partial class Extensions
{
    /// <summary>
    ///     Indicates whether the character at the specified position in a specified string is categorized as a letter or
    ///     a decimal digit.
    /// </summary>
    /// <param name="s">A string.</param>
    /// <param name="index">The position of the character to evaluate in .</param>
    /// <returns>true if the character at position  in  is a letter or a decimal digit; otherwise, false.</returns>
    public static Boolean IsLetterOrDigit(this String s, Int32 index)
    {
        return Char.IsLetterOrDigit(s, index);
    }
}