可以在 c# .net 控制台中暂停、缓存、刷新键盘输入吗？

Question

我想知道是否可以暂停，然后在 c# .net 控制台中缓存和刷新键盘输入。 例如，假设我创建了一个设置控制台 cursor position 的线程，写入字符以绘制进度条板（ANSI 字符），随着后台任务完成百分比的变化，线程再次更改 cursor 位置以添加进度条中的另一个条，cursor 变回原来的 position。与此同时，我想要原始线程处理 Console.ReadLine(); 我想知道我是否可以暂停、缓存和刷新键盘输入，或者是否有一种方法可以支持双向输入 output 而没有副作用。 这是一个示例：您会注意到，如果您按住该键，它会上升。

public void DrawScreenBackground()
{
    List<ConsoleColor> ColourArray = new List<ConsoleColor>();
    //ColourArray.Add(ConsoleColor.Black);
    ColourArray.Add(ConsoleColor.DarkGray);
    ColourArray.Add(ConsoleColor.DarkGreen);
    ColourArray.Add(ConsoleColor.Green);
    ColourArray.Add(ConsoleColor.Green);
    ColourArray.Add(ConsoleColor.DarkGreen);
    ColourArray.Add(ConsoleColor.DarkGray);

    int minProgress = 0;
    int maxProgress = 20;
    int currentProgress = minProgress;
    bool reverse = false;
    while (1 == 1)
    {
        if (!reverse)
        {
            if (currentProgress == maxProgress)
                reverse = !reverse;
            else
                currentProgress += 1;
        }
        else
        {
            if (currentProgress == minProgress)
                reverse = !reverse;
            else
                currentProgress -= 1;
        }
        //draw/////
        int curLeft = Console.CursorLeft;
        int curTop = Console.CursorTop;
        ConsoleColor defaultColor = Console.ForegroundColor;
        ConsoleColor item = ColourArray[0];
        ColourArray.RemoveAt(0);
        ColourArray.Insert(ColourArray.Count-1, item);
        DrawDoubleBorder(9, 9, 21, 2);
        Console.ForegroundColor = item;
        Console.SetCursorPosition(10, 10);
        for (int i = 0; i < maxProgress - minProgress; i += 1)
            Console.Write(" ");
        Console.SetCursorPosition(10, 10);
        for (int i = 0; i < currentProgress - minProgress; i += 1)
            Console.Write("#");
        Console.ForegroundColor = defaultColor;
        Console.SetCursorPosition(curLeft, curTop);
        ///////////
        Thread.Sleep(125);
    }
}
private void DrawDoubleBorder(int x, int y, int width, int height)
{
    Console.SetCursorPosition(x, y);
    int currentX = x;
    int currentY = y;
    for (int h = 0; h <= height; h += 1)
    {
        for (int w = 0; w <= width; w += 1)
        {
            if (w == 0 && h == 0)
                Console.Write(ConsoleChars.DoubleBorderTopLeft);
            else if (w == width && h == height)
                Console.Write(ConsoleChars.DoubleBorderBottomRight);
            else if (w == width && h == 0)
                Console.Write(ConsoleChars.DoubleBorderTopRight);
            else if (w == 0 && h == height)
                Console.Write(ConsoleChars.DoubleBorderBottomLeft);
            else if (w == 0 || w == width)
                Console.Write(ConsoleChars.DoubleBorderVerticle);
            else if (h == 0 || h == height)
                Console.Write(ConsoleChars.DoubleBorderHorizontal);
            else
                Console.Write(" ");
        }
        currentY += 1;
        Console.SetCursorPosition(currentX, currentY);
    }
}
public struct ConsoleChars
{
    public static char DoubleBorderHorizontal = (char)205;
    public static char DoubleBorderVerticle = (char)186;
    public static char DoubleBorderBottomLeft = (char)200;
    public static char DoubleBorderTopRight = (char)187;
    public static char DoubleBorderBottomRight = (char)188;
    public static char DoubleBorderFourWaySplit = (char)206;
    public static char DoubleBorderTopLeft = (char)201;
    public static char DoubleBorderLeftThreeWaySplit = (char)204;
    public static char DoubleBorderRightThreeWaySplit = (char)185;
}

        Thread thread = new Thread(new ThreadStart(DrawScreenBackground));
        thread.Start();
        Console.ReadLine();

编辑：解决方案=

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace ConsoleApplication1
{
    public class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = System.Text.Encoding.GetEncoding(1252);
            Thread thread = new Thread(new ParameterizedThreadStart(DrawScreenBackground));
            object locker = new object();
            thread.Start(locker);
            string input = string.Empty;
            while(!input.Contains("\r\n"))
            {
                string temp = FlushKeyBoardInput();
                if(temp!=string.Empty)
                {
                    lock(locker)
                    {
                        Console.Write(temp);
                        input+=temp;
                    }
                }
            }
        }

        public static string FlushKeyBoardInput()
        {
            string output = string.Empty;
            while (Console.KeyAvailable)
            {
                ConsoleKeyInfo key = Console.ReadKey(true);
                output += key.KeyChar;
            }
            return output;
        }

        public static void DrawScreenBackground(object locker)
        {
            List<ConsoleColor> ColourArray = new List<ConsoleColor>();
            //ColourArray.Add(ConsoleColor.Black);
            ColourArray.Add(ConsoleColor.DarkGray);
            ColourArray.Add(ConsoleColor.DarkGreen);
            ColourArray.Add(ConsoleColor.Green);
            ColourArray.Add(ConsoleColor.Green);
            ColourArray.Add(ConsoleColor.DarkGreen);
            ColourArray.Add(ConsoleColor.DarkGray);

            int minProgress = 0;
            int maxProgress = 20;
            int currentProgress = minProgress;
            bool reverse = false;
            while (1 == 1)
            {
                if (!reverse)
                {
                    if (currentProgress == maxProgress)
                        reverse = !reverse;
                    else
                        currentProgress += 1;
                }
                else
                {
                    if (currentProgress == minProgress)
                        reverse = !reverse;
                    else
                        currentProgress -= 1;
                }
                //draw/////
                lock (locker)
                {
                    int curLeft = Console.CursorLeft;
                    int curTop = Console.CursorTop;
                    ConsoleColor defaultColor = Console.ForegroundColor;
                    ConsoleColor item = ColourArray[0];
                    ColourArray.RemoveAt(0);
                    ColourArray.Insert(ColourArray.Count - 1, item);
                    DrawDoubleBorder(9, 9, 21, 2);
                    Console.ForegroundColor = item;
                    Console.SetCursorPosition(10, 10);
                    for (int i = 0; i < maxProgress - minProgress; i += 1)
                        Console.Write(" ");
                    Console.SetCursorPosition(10, 10);
                    for (int i = 0; i < currentProgress - minProgress; i += 1)
                        Console.Write("#");
                    Console.ForegroundColor = defaultColor;
                    Console.SetCursorPosition(curLeft, curTop);
                    ///////////
                }
                Thread.Sleep(50);
            }
        }
        public static void DrawDoubleBorder(int x, int y, int width, int height)
        {
            Console.SetCursorPosition(x, y);
            int currentX = x;
            int currentY = y;
            for (int h = 0; h <= height; h += 1)
            {
                for (int w = 0; w <= width; w += 1)
                {
                    if (w == 0 && h == 0)
                        Console.Write(ConsoleChars.DoubleBorderTopLeft);
                    else if (w == width && h == height)
                        Console.Write(ConsoleChars.DoubleBorderBottomRight);
                    else if (w == width && h == 0)
                        Console.Write(ConsoleChars.DoubleBorderTopRight);
                    else if (w == 0 && h == height)
                        Console.Write(ConsoleChars.DoubleBorderBottomLeft);
                    else if (w == 0 || w == width)
                        Console.Write(ConsoleChars.DoubleBorderVerticle);
                    else if (h == 0 || h == height)
                        Console.Write(ConsoleChars.DoubleBorderHorizontal);
                    else
                        Console.Write(" ");
                }
                currentY += 1;
                Console.SetCursorPosition(currentX, currentY);
            }
        }
        public struct ConsoleChars
        {
            public static char DoubleBorderHorizontal = (char)205;
            public static char DoubleBorderVerticle = (char)186;
            public static char DoubleBorderBottomLeft = (char)200;
            public static char DoubleBorderTopRight = (char)187;
            public static char DoubleBorderBottomRight = (char)188;
            public static char DoubleBorderFourWaySplit = (char)206;
            public static char DoubleBorderTopLeft = (char)201;
            public static char DoubleBorderLeftThreeWaySplit = (char)204;
            public static char DoubleBorderRightThreeWaySplit = (char)185;
        }
    }
}

注意：不支持退格键，最好自己画一个 cursor

Answer 1

不要使用Console.ReadLine()或Console.Read() 。 相反，看看Console.ReadKey()和Console.KeyAvailable()

刷新键盘队列非常简单：

public void FlushKeyBoardInput()
{
  while ( Console.KeyAvailable )
  {
    ConsoleKeyInfo key = Console.ReadKey() ;
  }
}

Console.ReadKey()甚至有一个重载，可让您控制是否将键回显到屏幕。

就暂停或缓存键盘输入而言，命令 shell 本身有一定数量的键盘缓冲区，但您希望将按键输入队列而不将它们作为缓存回显到屏幕，并编写输入方法以从从实际键盘拉出之前缓存。