random-generation.md

Random generation

When using the random generation, if the loop is particularly fast the system tick may not be different and the same number is generated twice, a small delay may help

Random number generator

Random r = new Random();

public void Start() 
{
    // Create a random integer value
	Int variableRandom = r.Next(min, max);
    // Create a random double value
	Double variableRandom = r.NextDouble()
}

Random strings generator

Using custom character list

private static Random random = new Random();

public static string RandomString(int stringLength) 
{
    // Set the subset of characters to be used
    const string usableCharacters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
    // Return the random string
    return new string(Enumerable.Repeat(usableCharacters, stringLength)
        .Select(s => s[random.Next(s.Length)]).ToArray());
}

public void Start() 
{
    // Call the method to generate the string
	String randomString = RandomString(10);
}

Using random GUID

Please note, this should never be used to generate passwords or tokens as it's not random enough. If high security is required, use the RandomNumberGenerator instead.

private string RandomString()
{
    // Create a new guid
    Guid newGuid = Guid.NewGuid();
    // Remove dashes to keep only alphanumeric characters
    return newGuid.ToString().Replace("-", "");
}

private static string GenerateRandomString(int length = 8)
{
    const string alphanumericChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    using var rng = System.Security.Cryptography.RandomNumberGenerator.Create();
    var bytes = new byte[length];
    rng.GetBytes(bytes);

    var chars = new char[length];
    for (int i = 0; i < length; i++)
    {
        chars[i] = alphanumericChars[bytes[i] % alphanumericChars.Length];
    }

    return new string(chars);
}

This one should be better

[ExportMethod]
public static void GenerateRandomString(out string randomString)
{
    // Create a random string generator using the RandomNumberGenerator class
    using var rng = RandomNumberGenerator.Create();
    // Create a byte array to store the random values
    var randomBytes = new byte[32];
    // Fill the byte array with random values
    rng.GetBytes(randomBytes);
    // Convert the byte array to a string
    randomString = Convert.ToBase64String(randomBytes).Substring(0, 32);
}