学了一周的C#，新人请教return的问题

Question

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace C_Sharp
{
    class Program
    {
            static bool Self()
            {
                Console.WriteLine("1、个人信息");
                Console.WriteLine("2、修改密码");
                Console.WriteLine("3、返回上级");
                Console.WriteLine("请输入数字");
                int myIntSelf;
                myIntSelf=Convert.ToInt32(Console.ReadLine());
                if (myIntSelf == 3)
                    return false;
                else
                    return true;
            }
            static bool Friend()
            {
                Console.WriteLine("1、添加好友");
                Console.WriteLine("2、删除好友");
                Console.WriteLine("3、返回上级");
                Console.WriteLine("请输入数字");
                int myIntFriend;
                myIntFriend=Convert.ToInt32(Console.ReadLine());
                if (myIntFriend == 3)
                    return false;
                else
                    return true;
            }
            static void Main(string[] args)
            {
                //约定，好友管理 Friend，个人管理 Self。
                //显示主界面
                Console.WriteLine("1、个人管理");
                Console.WriteLine("2、好友管理");
                Console.WriteLine("3、退出系统");
                Console.WriteLine("请输入数字");
                int myCase = Convert.ToInt32(Console.ReadLine());
                bool BoolFriend = true, BoolSelf = true, BoolMain = true;
                while(BoolMain)
                {
                    if (myCase == 3)
                    {
                        Console.WriteLine("拜拜");
                        BoolMain = false;
                    }
                    else if (myCase >= 1 && myCase <= 2)
                    {
                        switch (myCase)
                        {
                            case 1:
                                while (BoolSelf)
                                    BoolSelf = Self();
                                break;
                            case 2:
                                while (BoolFriend)
                                    BoolFriend = Friend();
                                break;
                            default:
                                Console.WriteLine("输入错误，请重新输入");
                                myCase = Convert.ToInt32(Console.ReadLine());
                                break;
                        }
                    }
                    else
                    {
                        Console.WriteLine("输入错误，请重新输入");
                        myCase = Convert.ToInt32(Console.ReadLine());
                    }
                }
       
            }
    }
}代码很短，而且只是一个架子，我发现当我进入二级菜单之后，不能返回上级界面。只要输入3，程序立马停止，必须用鼠标点击窗口来关闭。请问各位高手，我的错误在哪里？

Answer 1

楼主这个不好慢慢改，发个代码，你自己对照着看吧namespace ConsoleApplication2
{
    class Program
    {
        [STAThread]
        static void Main(string[] args)
        {
            //约定，好友管理 Friend，个人管理 Self。
            //显示主界面
            bool BoolMain = true;
            while (BoolMain)
            {
                Console.WriteLine("1、个人管理");
                Console.WriteLine("2、好友管理");
                Console.WriteLine("3、退出系统");
                Console.WriteLine("请输入数字");
                int myCase = Convert.ToInt32(Console.ReadLine());
                if (myCase == 3)
                {
                    Console.WriteLine("拜拜");
                    BoolMain = false;
                }
                else if (myCase >= 1 && myCase <= 2)
                {
                    switch (myCase)
                    {
                        case 1:
                            //while (BoolSelf)
                            Self();
                            break;
                        case 2:
                            //while (BoolFriend)
                            Friend();
                            break;
                        default:
                            Console.WriteLine("输入错误，请重新输入");
                            myCase = Convert.ToInt32(Console.ReadLine());
                            break;
                    }
                }
                else
                {
                    Console.WriteLine("输入错误，请重新输入");
                    myCase = Convert.ToInt32(Console.ReadLine());
                }
            }
        }        static void Self()
        {
            while (true)
            {
                Console.WriteLine("1、个人信息");
                Console.WriteLine("2、修改密码");
                Console.WriteLine("3、返回上级");
                Console.WriteLine("请输入数字");
                int myIntSelf;
                myIntSelf = Convert.ToInt32(Console.ReadLine());
                if (myIntSelf == 3)
                    return ;            }
        }
        static void Friend()
        {
            while (true)
            {
                Console.WriteLine("1、添加好友");
                Console.WriteLine("2、删除好友");
                Console.WriteLine("3、返回上级");
                Console.WriteLine("请输入数字");
                int myIntFriend;
                myIntFriend = Convert.ToInt32(Console.ReadLine());
                if (myIntFriend == 3)
                    return ;
                
            }
        }
    }
}

Answer 2

using System;
using System.Collections.Generic;
using System.Text;namespace C_Sharp
{
    class Program
    {
        static bool Self()
        {
            Console.WriteLine("1、个人信息");
            Console.WriteLine("2、修改密码");
            Console.WriteLine("3、返回上级");
            Console.WriteLine("请输入数字");
            int myIntSelf;
            myIntSelf = Convert.ToInt32(Console.ReadLine());
            if (myIntSelf == 3)
            {
                Main(null);
                return false;
            }
            else
            {
                return true;
            }
        }
        static bool Friend()
        {
            Console.WriteLine("1、添加好友");
            Console.WriteLine("2、删除好友");
            Console.WriteLine("3、返回上级");
            Console.WriteLine("请输入数字");
            int myIntFriend;
            myIntFriend = Convert.ToInt32(Console.ReadLine());
            if (myIntFriend == 3)
            {
                Main(null);
                return false;
            }
            else
            {
                return true;
            }
        }
        static void Main(string[] args)
        {
            //约定，好友管理 Friend，个人管理 Self。
            //显示主界面
            Console.WriteLine("1、个人管理");
            Console.WriteLine("2、好友管理");
            Console.WriteLine("3、退出系统");
            Console.WriteLine("请输入数字");
            int myCase = Convert.ToInt32(Console.ReadLine());
            bool BoolFriend = true, BoolSelf = true, BoolMain = true;
            while (BoolMain)
            {
                if (myCase == 3)
                {
                    Console.WriteLine("拜拜");
                    BoolMain = false;
                }
                else if (myCase >= 1 && myCase <= 2)
                {
                    switch (myCase)
                    {
                        case 1:
                            while (BoolSelf)
                               BoolSelf = Self();
                            break;
                        case 2:
                            while (BoolFriend)
                                BoolFriend = Friend();
                            break;
                        default:
                            Console.WriteLine("输入错误，请重新输入");
                            myCase = Convert.ToInt32(Console.ReadLine());
                            break;
                    }
                }
                else
                {
                    Console.WriteLine("输入错误，请重新输入");
                    myCase = Convert.ToInt32(Console.ReadLine());
                }
            }        }
    }
}

Answer 3

其实已经返回只是你没给返回后执行任何代码而已~~所以在返回FALSE前加上Main(null);

Answer 4

goto语句在这里派上用场 了，试一下。

Answer 5

看来，我对于整个程序的流程，并没有规划好。光顾着整个大背景，没有考虑好细节。
感谢 sdfkfkd 对我思路的改进，并且让我看到当函数是void的时候，return仍然可以应用。
感谢 xu56180825 对我错误的指出和回答，Main(null)，哈，我太粗心了。
肯来看我的程序，修改我的程序，帮助我进步。真是非常感谢。

Answer 6

我的改进，只不过是在while下面，添加了语句，让这个while有事可做。于是整个程序就毫无问题了。
    while(BoolMain)
                {
                    Console.WriteLine("1、个人管理");
                    Console.WriteLine("2、好友管理");
                    Console.WriteLine("3、退出系统");
                    Console.WriteLine("请输入数字");
                    myCase = Convert.ToInt32(Console.ReadLine());
                    if (myCase == 3)
                    {
                        Console.WriteLine("拜拜");
                        BoolMain = false;
                    }
                    else if (myCase >= 1 && myCase <= 2)
                    {
                        switch (myCase)
                        {
                            case 1:
                                while (BoolSelf)
                                    BoolSelf = Self();
                                break;
                            case 2:
                                while (BoolFriend)
                                    BoolFriend = Friend();
                                break;
                            default:
                                Console.WriteLine("输入错误，请重新输入");
                                myCase = Convert.ToInt32(Console.ReadLine());
                                break;
                        }
                    }
                    else
                    {
                        Console.WriteLine("输入错误，请重新输入");
                        myCase = Convert.ToInt32(Console.ReadLine());
                    }
                }
谢谢各位大神。