public static string GetUniqueSequence(this ASCIIEncoding encoding, int?numberOfCharacters = null)
{
// For the purpose of this example app, ensure numberOfCharacters doesn't exceed GetMaximumCharacterLimit
// to ensure all characters are unique (input should be validated instead)
int length = numberOfCharacters == null || numberOfCharacters > encoding.GetMaximumCharacterLimit()
? encoding.GetMaximumCharacterLimit()
: numberOfCharacters.Value;
var byteArray = new byte[encoding.GetMaximumCharacterLimit()];
for (int i = 0; i < length; i++)
{
byteArray[i] = (byte)i;
}
return(encoding.GetString(byteArray));
}
public static string GetNonUniqueSequence(this ASCIIEncoding encoding, int?numberOfCharacters = null)
{
numberOfCharacters = numberOfCharacters <= 1 ? 2 : numberOfCharacters; // Force non unique sequence for purposes of this example (input should be validated instead)
int length = numberOfCharacters ?? encoding.GetMaximumCharacterLimit();
int restart = length == 2 ? 0 : length / 2; // Ensures at least half the characters are the same
int restartCount = 0;
var byteArray = new byte[length];
for (int i = 0; i < length; i++)
{
byteArray[i] = (byte)restartCount;
restartCount = restartCount == restart ? 0 : restartCount + 1;
}
return(encoding.GetString(byteArray));
}