public void Login()
        {
            int count=3;
            for (int i = 3; i >0 ; i--)
            {
                Console.WriteLine("请输入用户名：");
                string username = Console.ReadLine();
                Console.WriteLine("请输入密码：");
                string userpwd = Console.ReadLine();
                int result = dbo.CheckUserInfo(username, userpwd);
                if (result == 1)
                {
                    Console.WriteLine("登录成功！");
                    ShowMenu();
                }
                else
                {
                    Console.WriteLine("登录失败！");
                    Login();
                }
                count = i - 1;
                break;
            }
            if (count == 0)
            {
                Console.WriteLine("您没有进入权限！");
            }
            else
            {
                Console.WriteLine("您还有[0]次机会，请重新输入。",count
            }
        }
   提示说检测到无法运行的代码 i--；

你的 break;直接跳出for循环了

为什么无法实现 循环3次的功能啊 他是一直无限循环啊~~

for (int i = 0; i <3 ; i++)

public void Login()
        {
            int count;
            for (int i = 3; i <3 ; i++)
            {
                Console.WriteLine("请输入用户名：");
                string username = Console.ReadLine();
                Console.WriteLine("请输入密码：");
                string userpwd = Console.ReadLine();
                int result = dbo.CheckUserInfo(username, userpwd);
                if (result == 1)
                {
                    Console.WriteLine("登录成功！");
                    ShowMenu();
                }
                else
                {
                    Console.WriteLine("登录失败！");
                    Login();
                }
                count = i ;
                break;
            }
            if (count == 3)
            {
                Console.WriteLine("您没有进入权限！");
            }
            else
            {
                Console.WriteLine("您还有[0]次机会，请重新输入。",count
            }
        }

BREAK;去了吧

都不对~~~

我说我的哥啊,你的逻辑有点乱耶,就这几行代码,问题还真多.
首先break;应该放在if (result == 1)里面,因为登录成功,就可以退出循环,不用再验证了
再看else,因为你要循环3次,就算其中一次不成功,那不应该提示失败,应该提示还有N次机会
Login();不要放在for里面,因类你从新调用方法以后,for计数器i又从新赋值了,变成无限递归循环了,按照你的想法,Login()这句应该没有必要写的
最后if (count == 0)
            {
                Console.WriteLine("您没有进入权限！");
            }
            else
            {
                Console.WriteLine("您还有[0]次机会，请重新输入。",count
            }
这里else应该就不需要了,至于if里面,你要提示没有权限也好,还是登录失败也好,其实都是一个意思

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