保持Console.ReadLine总是在最后一行 [英] Keep Console.ReadLine always on last line

问题描述

我有一个用C＃编写的应用程序，它通过while（true）循环和Console.ReadLine连续地从用户发出命令。

I have an application written in C# which takes continuously commands from the user via a while(true) loop and Console.ReadLine.

我也有各种背景操作通过控制台报告。查看这个简单的例子：

I also do have various background operations which report back via the console. View this simple example:

class Program
{  
        static void Main(string[] args)
        {
            new Messager(1000 * 2.5f);
            new Messager(1000 * 3);
            while (true)
            {
                Console.ReadLine();
            }
        }
}

public class Messager
{
    Timer Timer;

    public Messager(double interval)
    {
        this.Timer = new Timer(interval);
        this.Timer.Elapsed += (sender, e) =>
        {
            Console.WriteLine("message from " + this.Timer.Interval);
        };
        this.Timer.Start();
    }
}

问题是，当我输入命令和Messager在我按下Enter之前报告回来Messager中的消息将被追加到当前行，光标将被放置到下一行。请参阅以下屏幕截图：

The problem is, when I enter a command and a Messager reports back before I have pressed Enter the message from the Messager will be appended to my current line and the cursor will be placed into the next line. See this screenshot:

你猜想我不想那样。我想要一个命令的当前输入总是保持在最后一行，并且所有的消息都放在该行的上面。正如你从这样的应用程序所期望的。

As you'd guess I don't want that. I want the current inputting of a command to remain always in the last line and have all the messages coming placed above that line. Just as you'd expect from such an application. How do I achieve that?

推荐答案

这是我的问题的答案：

class Program
{
    static void Main(string[] args)
    {
        new Messager(1000 * 2.5f);
        new Messager(1000 * 3);
        while (true)
        {
            Console.ReadLine();
        }
    }
}

public class Messager
{
    Timer Timer;

    public Messager(double interval)
    {
        this.Timer = new Timer(interval);
        this.Timer.Elapsed += (sender, e) =>
        {
            int currentTopCursor = Console.CursorTop;
            int currentLeftCursor = Console.CursorLeft;

            Console.MoveBufferArea(0, currentTopCursor, Console.WindowWidth, 1, 0, currentTopCursor + 1);

            Console.CursorTop = currentTopCursor;

            Console.CursorLeft = 0;

            Console.WriteLine("message from " + this.Timer.Interval);

            Console.CursorTop = currentTopCursor +1;
            Console.CursorLeft = currentLeftCursor;

        };
        this.Timer.Start();
    }
}

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