C# n'是错误的，我试着运行它时纠正了它。但我在尝试运行此解决方案时仍然出现错误。我认为错误是因为我复制了我的announce和getstring方法，但没有意识到这一点。在把这些方法放回去后我重新测试了一遍，结果很有效。但是它有一个缺陷，如果“default

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n'是错误的，我试着运行它时纠正了它。但我在尝试运行此解决方案时仍然出现错误。我认为错误是因为我复制了我的announce和getstring方法，但没有意识到这一点。在把这些方法放回去后我重新测试了一遍，结果很有效。但是它有一个缺陷，如果“default”语句打印到控制台，任何结果都会得到一个“我不知道”命令来反复打印。所以如果我输入V那么E@GrantWinney：谢谢亲爱的：）编辑了我的帖子。我尝试了这个，但是我犯了很多错误。我看到单词is关键字“return”是错误的，我在尝试运行它时更正了它。但我在尝试运行此解决方案时仍然出现错误。我认为错误是因为我复制了我的announce和getstring方法，但没有意识到这一点。在把这些方法放回去后我重新测试了一遍，结果很有效。但是它有一个缺陷，如果“default”语句打印到控制台，任何结果都会得到一个“我不知道”命令来反复打印。所以如果我进入V，那么EWOW。我认为这是非常优雅和聪明的（我的新手无论如何都能完全理解它）。我修改了我的代码，用select方法（）注释掉了elseif（command=='e'），然后运行它，它成功了。我在这里学到了很多。谢谢你，格兰特。我认为这是非常优雅和聪明的（我的新手无论如何都能完全理解它）。我修改了我的代码，用select方法（）注释掉了elseif（command=='e'），然后运行它，它成功了。我在这里学到了很多。谢谢你，格兰特。我觉得这真的太棒了，还有很多建议让我的大脑以一种非常棒的方式融化——谢谢大家。我不知道bool可以用来向控制台发送文本。我必须深入研究这件事。没问题，很高兴我能帮上忙。bool向控制台发送文本是什么意思？bool只是一个标志，指示是否使用了正确的命令。我们有一个bool，该方法将文本发送到字符串，我非常期待bool返回true或false，我想我可以在该方法中使用其他东西，并将其发送到控制台。我认为这也非常棒，正如许多建议一样，这些建议让我的大脑以令人敬畏的方式融化——谢谢大家。我不知道bool可以用来向控制台发送文本。我必须深入研究这件事。没问题，很高兴我能帮上忙。bool向控制台发送文本是什么意思？bool只是一个标志，指示是否使用了正确的命令。我们有一个bool，该方法将文本发送到字符串，我非常担心bool返回true或false，我完全没有想到我可以在该方法中使用其他东西，并将其发送到控制台。

    class Program
{
    public void Play(){
        Announcer(" \n\nProgram Name Goes Here \n\n");

        while (true)
        {
            /*
             * Allow user to display director of books (Three)
             * allow user to select specific book with any comments it might have (2-4 comments)
             * Allow user to enter a specific comment
             * display book with new new added comment
             * Allow user to exit book
             * */
            Select();                
        Console.Read();
        }
    }


    public void Announcer(String strTxt){Console.Write(strTxt);}

    public String GetString(String strData){
        Console.WriteLine(strData);
        return Console.ReadLine();//traffic control => back to program
    }

    public void Select(){
        String command = GetString(" \n\n(V)eiw, (S)elect, (C)omment, (R)emove, (E)xit").ToLower();

            if (command == "v")
            { Announcer(" \n\nEnter listing: ");
              //ViewDirectory();//call view directory here
            }

            else if (command == "c")
            { Announcer(" \n\nEnter comment: "); }

            else if (command == "s")
            {                   
                //we want to do a selectString method that returns length of selects here
                String select = GetString(" \n\n(1)st Selection, (2)nd Selection, (3)rd book, (E)xit").ToLower();
                if (select == "1")
                { Announcer(" \n\nDisplay book info + allow for user comment entering"); }

                else if (select == "2")
                { Announcer(" \n\nDisplay book info + allow for user comment entering"); }

                else if (select == "3")
                { Announcer(" \n\nDisplay book info + allow for user comment entering"); }                
            }

            else if (command == "e") { break; }
            else { Console.WriteLine("\n\nOopsy, I don't know that command! \n\n"); }
        }
    }

    //public void ViewDirectory(){
    //    Console.WriteLine("stuff");

    //}

 class Program
{
    public void Play(){
    Announcer(" \n\nProgram Name Goes Here \n\n");

    while (true)
    {
        /*
         * Allow user to display director of books (Three)
         * allow user to select specific book with any comments it might have (2-4 comments)
         * Allow user to enter a specific comment
         * display book with new new added comment
         * Allow user to exit book
         * */
         if(Select())
             break;   //break if you get return value of Select() as true
         Console.Read();
     }
}


 public bool Select(){
    String command = GetString(" \n\n(V)eiw, (S)elect, (C)omment, (R)emove, (E)xit").ToLower();

        if (command == "v")
        { Announcer(" \n\nEnter listing: ");
          //ViewDirectory();//call view directory here
         return false;
        }

        else if (command == "c")
        { Announcer(" \n\nEnter comment: ");  return false;}

        else if (command == "s")
        {                   
            //we want to do a selectString method that returns length of selects here
            String select = GetString(" \n\n(1)st Selection, (2)nd Selection, (3)rd book, (E)xit").ToLower();
            if (select == "1")
            { Announcer(" \n\nDisplay book info + allow for user comment entering"); }

            else if (select == "2")
            { Announcer(" \n\nDisplay book info + allow for user comment entering"); }

            else if (select == "3")
            { Announcer(" \n\nDisplay book info + allow for user comment entering"); }                

             return false;           
           }

        else if (command == "e") { return true; }
        else { Console.WriteLine("\n\nOopsy, I don't know that command! \n\n"); return 
          false; }
    }
}

while (true)
{
    var command
      = GetString(" \n\n(V)eiw, (S)elect, (C)omment, (R)emove, (E)xit").ToLower();

    if (command == "e")
        break;

    Select(command);

    Console.Read();
}

if(Select())
{
     break;
}

while (Select())
{
    /*
     * Allow user to display director of books (Three)
     * allow user to select specific book with any comments it might have (2-4 comments)
     * Allow user to enter a specific comment
     * display book with new new added comment
     * Allow user to exit book
     * */     
    Console.Read();
}

public bool Select()
{
    bool isValid = true;
    String command = GetString(" \n\n(V)eiw, (S)elect, (C)omment, (R)emove, (E)xit").ToLower();

    switch (command)
    {
        case "v":
            Announcer(" \n\nEnter listing: ");
        //ViewDirectory();//call view directory here
            break;
        case "c":
            Announcer(" \n\nEnter comment: ");
            break;
        case "s":
        {
            //we want to do a selectString method that returns length of selects here
            String select = GetString(" \n\n(1)st Selection, (2)nd Selection, (3)rd book, (E)xit").ToLower()

            switch (select)
            {
                case "1":
                    Announcer(" \n\nDisplay book info + allow for user comment entering"); 
                    break;
                case "2":
                    Announcer(" \n\nDisplay book info + allow for user comment entering");
                    break;
                case "3":
                    Announcer(" \n\nDisplay book info + allow for user comment entering");
                    break;
            }
            break;
        }
        case "e":
            isValid = false;
            break;
        default:
            Console.WriteLine("\n\nOopsy, I don't know that command! \n\n");
            break;
    }
    return isValid;
}

switch (val)
{
    //this line should not be here
    dosomething1(); //==>error
    case "low":
        dosomething2();
        break;
    case "high":
        dosomething3();
        break;
}