如何在dotnet应用程序中创建导航菜单? [英] How to create a navigation menu in dotnet application?

问题描述

我创建了一个控制台应用程序，该应用程序具有一个菜单，允许我在菜单项之间导航.我通过这种方法处理导航逻辑:

I have created a console application which have a menu that allow me to navigate between the menu items. I handle the navigation logic in this method:

public virtual void updateMenu()
{
    switch (Console.ReadKey(true).Key)
    {
        case ConsoleKey.UpArrow:
            {
                if (cursor > 0)
                {
                    cursor--;
                    Console.Clear();
                    drawWithHeader();
                }
            }
            break;
        case ConsoleKey.DownArrow:
            {
                if (cursor < (menuItemList.Count - 1))
                {
                    cursor++;
                    Console.Clear();
                    drawWithHeader();
                }
            }
            break;
        case ConsoleKey.Escape:
            {
                if (ParentMenu != null)
                {

                    hideMenu();
                }
            }
            break;
        case ConsoleKey.Enter:
            {
                Console.Clear();
                drawHeader();
                Console.CursorVisible = true;
                menuItemList[cursor].Action();
                Console.CursorVisible = false;
                Console.Clear();
                drawWithHeader();
            }
            break;
        default:
            {
                // Unsuported key. Do nothing....
            }
            break;
    }
}

此处是完整的类.

现在在Windows上一切正常，但是当我使用systemd在Linux上运行此应用程序时，我得到了:

Now on windows all works well, but when I run this application on my linux with systemd I get:

未处理的异常:System.InvalidOperationException:当任一应用程序没有控制台或控制台输入已重定向时，无法读取密钥.尝试Console.Read.

Unhandled Exception: System.InvalidOperationException: Cannot read key when either application does not have a console or when console input has been redirected. Try Console.Read.

stacktrace显示:

The stacktrace display:

at System.ConsolePal.ReadKey(Boolean intercept)
at System.Console.ReadKey();
at AppRazen.Menu.ConsoleMenu.UpdateMenu();  

经过一番搜索，我发现此问题与ReadKey()方法有关并不完全此处在我的情况下根本行不通，因为用户已使用OminSharp.

After some searching I discovered that this problem is related to the ReadKey() method is not fully compatible with linux. And the solution proposed here simply doesn't work in my case, because the user has used OminSharp.

我还尝试设置了ReadKey(false)，但这并没有解决问题，我还尝试使用Console.Read()处理UpdateMenu中的所有内容，但是控制台似乎卡住了.

I also tried to set ReadKey(false) but this didn't fixed the problem, and I also tried to handle all the stuff inside UpdateMenu with Console.Read() but the console seems stuck.

请注意，仅当我在linux主管中运行脚本而不使用dotnet AppRazen.dll

Note that this issue will happen only when I run my script in linux supervisor not with the default command like dotnet AppRazen.dll

基本上，我正在使用systemd服务运行脚本，如下所示:

Essentially I'm running the script with a systemd service like this:

[Unit]
Description = Daemon description

[Service]
ExecStart = /usr/bin/dotnet /home/root/Desktop/publish/AppRazen.dll
WorkingDirectory= /home/root/Desktop/publish
Restart = always
RestartSec = 3

[Install]
WantedBy = multi-user.target

老实说，我不知道该如何解决.有人有什么想法吗?

I honestly I don't know how can I fix that. Someone have any ideas?

谢谢.

推荐答案

要做自己想做的简短答案就是根本做不到.

The short answer to doing what you want to do is that you simply can't.

考虑一下:您正在尝试创建一个交互式程序(用户可以通过键盘与之交互).但是，您也将其设置为守护程序(守护进程会在后台运行，并且不会直接与用户进行交互).这是两个相互矛盾的目标.

Think about it: you are trying to have an interactive program (that users can interact with via the keyboard). But you are also making it a daemon (a deamon runs the background and doesn't interact with users directly). These are two contradictory goals.

当systemd(或supervisord，upstart或实际上任何系统服务程序)将您的应用程序作为服务运行时，它不提供与用户交互的方式，因为这些应用程序希望守护程序-这意味着用户无法与它们进行交互.

When systemd (or supervisord, or upstart or really any system services program) runs your application as a service, it doesn't give it a way to interact with users, since these applications want to be daemons - which means users can't interact with them.

因此，问自己想做什么:是否要制作交互式程序?如果要制作交互式程序，则不能通过主管运行它.通过dotnet /path/to/your.dll直接运行.

So, ask yourself what you want to do: do you want to make an interactive program or not? If you want make an interactive program you can't run it via supervisor. Run it directly, via dotnet /path/to/your.dll.

其他评论:

• ReadKey可能有问题，但肯定不是在您要干的常见情况下出现的，这似乎是x86_64上的Linux.

• ReadKey may have issues, but certainly not in the common case that you are drying to do, which seems to be Linux on x86_64.

OmniSharp是IDE/文本编辑器的插件，可简化开发.它提供自动完成和实时语法突出显示功能.在您运行应用程序时不涉及此操作.

OmniSharp is a plugin for IDEs/text-editors to make development easier. It provides auto completion and real time syntax highlighting. It's not involved when you are running your application.

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