小编Man*_*ngh的帖子

public void generate()
{
    string alphabets = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    string small_alphabets = "abcdefghijklmnopqrstuvwxyz";
    string numbers = "1234567890";
    string characters = numbers;
    characters += alphabets + small_alphabets + numbers;

    int length =6;
    string opt = string.Empty;
    for (int i = 0; i < length; i++)
    {
        string character = string.Empty;
        do
        {
            int index = new Random().Next(0, characters.Length);
            character = characters.ToCharArray()[index].ToString();
        } while (otp.IndexOf(character) != -1);
        otp += character;
    }
    string str= otp;
}

这是我的代码，对我不起作用。我想尝试小字母、大写字母和 0 到 9 的数字组合。