C#控制台 - 如何在没有新行的情况下读取线条()？(或撤消\n或垂直\ b)

Question

我想知道当我在下一行的开头时是否有可能回到最后一行？(当然是在C#Console中)

我的意思是Console.WriteLine()因为进入下一行,即使按下回车后我也想留在我的行中.(我认为没有另一种方法可以在不进入下一行的情况下使用ReadLine,是吗？)

我发现这Console.SetCursorPosition()可能很有用,如下所示:

        int x, y;
        Console.WriteLine("Please enter the point's coordinates in this form (x,y):");
        Console.Write("(");
        x = Convert.ToInt32(Console.ReadLine());
        Console.SetCursorPosition(x.ToString().Length + 1, Console.CursorTop - 1);
        Console.Write(",");
        y = Convert.ToInt32(Console.ReadLine());
        Console.SetCursorPosition(x.ToString().Length + y.ToString().Length + 2, Console.CursorTop - 1);
        Console.WriteLine(")");

这似乎工作正常,但当我试图改变Console.Write("("); 在某些事情上Console.Write("Point A=("),我需要Console.SetCursorPosition()每次更改参数.

如果我可以将光标移动到控制台缓冲区中的最后一个字符(空格除外),那将非常有用.(我认为如果我可以将一个特定的行从控制台复制到字符串中会很容易.)

提前致谢.

Answer 1

如何使用适合您特定用例的简单助手类,并使您的代码逻辑更具可读性.

public class Prompt
{
    public struct CursorPosition
    {
        public int CursorLeft;
        public int CursorTop;
    }

    private CursorPosition _savedPosition;

    public Prompt Write(string prompt)
    {
        Console.Write(prompt);
        return this;
    }

    public Prompt Write(string promptFormat, params object[] args)
    {
        return Write(string.Format(promptFormat, args));
    }

    public Prompt WriteLine(string prompt)
    {
        Write(prompt);
        Console.WriteLine();
        return this;
    }

    public Prompt WriteLine(string promptFormat, params object[] args)
    {
        return WriteLine(string.Format(promptFormat, args));
    }

    public string ReadLine(bool advanceCursorOnSameLine = false, bool eraseLine = false)
    {
        if (advanceCursorOnSameLine || eraseLine)
        {
            SavePosition();
            if (eraseLine)
                WriteLine(new string(' ', Console.WindowWidth - _savedPosition.CursorLeft)).RestorePosition();
        }
        var input = Console.ReadLine();
        if (advanceCursorOnSameLine)
            RestorePosition(input.Length);
        return input;
    }

    public Prompt SavePosition()
    {
        _savedPosition = GetCursorPosition();
        return this;
    }

    public CursorPosition GetCursorPosition()
    {
        return new CursorPosition {
            CursorLeft = Console.CursorLeft,
            CursorTop = Console.CursorTop
        };
    }

    public Prompt RestorePosition(CursorPosition position, int deltaLeft = 0, int deltaTop = 0)
    {
        var left = Math.Min(Console.BufferWidth - 1, Math.Max(0, position.CursorLeft + deltaLeft));
        var right = Math.Min(Console.BufferHeight - 1, Math.Max(0, position.CursorTop + deltaTop));
        Console.SetCursorPosition(left, right);
        return this;
    }

    public Prompt RestorePosition(int deltaLeft = 0, int deltaTop = 0)
    {
        return RestorePosition(_savedPosition, deltaLeft, deltaTop);
    }
}

然后可以像这样使用:

class Program
{
    public static void Main(params string[] args)
    {
        int x, y;
        var prompt = new Prompt();
        prompt.WriteLine("Please enter the point's coordinates in this form (x,y):");
        var savedPos = prompt.GetCursorPosition();
        while (true)
        {
            x = Convert.ToInt32(prompt.Write("(").ReadLine(true, true));
            y = Convert.ToInt32(prompt.Write(",").ReadLine(true));
            prompt.WriteLine(")");
            // do something with x and y

            var again = prompt.Write("More (Y):").ReadLine(true, true);
            if (!again.StartsWith("Y", StringComparison.OrdinalIgnoreCase))
                break;
            prompt.RestorePosition(savedPos);
        }
    }
}