为什么即使密码不匹配我的do-while循环也不会重​​复？

Question

我的程序应该无限地要求用户重新输入用户名和密码，直到它与他们的第一个输入匹配为止，但是循环仅运行一次。当用户在3次尝试中输入正确的详细信息时，我已经切断了该部分的工作，因此请不要让我重写它，否则，此提交内容将无法覆盖更有经验的开发人员。请帮我解决此问题，因为我真的想让该程序运行。

Console.WriteLine("Entry denied");
Console.WriteLine("Please re-enter your username:");
string username3 = Console.ReadLine();
Console.WriteLine("Please re-enter your password");
string password3 = Console.ReadLine();

do
{
    Console.WriteLine("Please re-enter your username once more:");
    string username4 = Console.ReadLine();
    Console.WriteLine("Please re-enter your password once more");
    string password4 = Console.ReadLine();

    if (username == username4) 
    {
        usernamematch = true;
        if (usernamematch == true)
        {
            if (password == password4) 
            {
                passwordmatch = true;
                if (passwordmatch == true)
                {
                    Console.WriteLine("You, at this point, would be redirected to   our webpage but this is c# programming.");
                    break;
                }
                else
                {

                }
            }
        }
    }
    else
    {

    }
} while (username != username3 || password != password3);

Answer 1

这仍然有您的无限循环（不建议使用），但可以完成工作。在while循环布尔中，除了“ true”以外，不需要使用其他任何东西，因为您将使用“ break;”来打破它。

Console.WriteLine("Entry denied");
Console.WriteLine("Please re-enter your username:");
string username3 = Console.ReadLine();
Console.WriteLine("Please re-enter your password");
string password3 = Console.ReadLine();

while (true)
{
    Console.WriteLine("Please re-enter your username once more:");
    string username4 = Console.ReadLine();
    Console.WriteLine("Please re-enter your password once more");
    string password4 = Console.ReadLine();

    usernamematch = username == username4;
    passwordmatch = password == password4;
    if (usernamematch && passwordmatch) 
    {
        Console.WriteLine("You, at this point, would be redirected to   our webpage but this is c# programming.");
        break;               
    }
}