public static string GeneratePassword(StringOptions options = null)
{
options ??= new StringOptions
{
RequiredLength = 10,
RequireDigit = true,
RequireLowercase = true,
RequireUppercase = true,
RequiredUniqueChars = 4,
RequireNonLetterOrDigit = true,
RequireNonAlphanumeric = true
};
return(GenerateRandomString(options));
}
/// <summary>
/// Generates the random password.
/// </summary>
/// <param name="options">The options.</param>
/// <returns>System.String.</returns>
public static string GenerateRandomString(StringOptions options = null)
{
options ??= new StringOptions
{
RequiredLength = 10,
RequireDigit = true,
RequireLowercase = true,
RequireUppercase = true,
RequiredUniqueChars = 4,
RequireNonLetterOrDigit = true,
RequireNonAlphanumeric = true
};
var randomChars = new[]
{
"ABCDEFGHJKLMNOPQRSTUVWXYZ", // uppercase
"abcdefghijkmnopqrstuvwxyz", // lowercase
"0123456789", // digits
"!@$?_-" // non-alphanumeric
};
// Using our private randomizer
var rand = RandomSeed();
var chars = new List <char>();
if (options.RequireUppercase)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[0][rand.Next(0, randomChars[0].Length)]);
}
if (options.RequireLowercase)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[1][rand.Next(0, randomChars[1].Length)]);
}
if (options.RequireDigit)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[2][rand.Next(0, randomChars[2].Length)]);
}
if (options.RequireNonAlphanumeric)
{
chars.Insert(rand.Next(0, chars.Count),
randomChars[3][rand.Next(0, randomChars[3].Length)]);
}
var rcs = randomChars[rand.Next(0, randomChars.Length)];
for (var i = chars.Count;
i < options.RequiredLength ||
chars.Distinct().Count() < options.RequiredUniqueChars;
i++)
{
chars.Insert(rand.Next(0, chars.Count),
rcs[rand.Next(0, rcs.Length)]);
}
return(new string(chars.ToArray()));
}