Console.Clear()无法清除控制台回滚缓冲区，求完整清除方案

Console.Clear()仅清除当前控制台窗口的可见区域内容，回滚缓冲区中超出窗口高度的历史输出不会被清除。以下是几种可行的解决方法，无需开发分页器：

方法一：调用Windows原生API（仅Windows平台） #

通过Win32 API直接操作控制台屏幕缓冲区，覆盖所有内容并重置属性：

using System;
using System.Runtime.InteropServices;

class Program
{
    [DllImport("kernel32.dll", SetLastError = true)]
    static extern IntPtr GetStdHandle(int nStdHandle);

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool GetConsoleScreenBufferInfo(IntPtr hConsoleOutput, out CONSOLE_SCREEN_BUFFER_INFO lpConsoleScreenBufferInfo);

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool FillConsoleOutputCharacter(IntPtr hConsoleOutput, char cCharacter, uint nLength, COORD dwWriteCoord, out uint lpNumberOfCharsWritten);

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern bool FillConsoleOutputAttribute(IntPtr hConsoleOutput, ushort wAttribute, uint nLength, COORD dwWriteCoord, out uint lpNumberOfAttrsWritten);

    const int STD_OUTPUT_HANDLE = -11;

    struct COORD
    {
        public short X;
        public short Y;
        public COORD(short X, short Y)
        {
            this.X = X;
            this.Y = Y;
        }
    };

    struct SMALL_RECT
    {
        public short Left;
        public short Top;
        public short Right;
        public short Bottom;
    };

    struct CONSOLE_SCREEN_BUFFER_INFO
    {
        public COORD dwSize;
        public COORD dwCursorPosition;
        public ushort wAttributes;
        public SMALL_RECT srWindow;
        public COORD dwMaximumWindowSize;
    };

    public static void ClearConsole()
    {
        IntPtr hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
        GetConsoleScreenBufferInfo(hConsole, out CONSOLE_SCREEN_BUFFER_INFO csbi);

        uint screenSize = (uint)csbi.dwSize.X * (uint)csbi.dwSize.Y;
        COORD topLeft = new COORD(0, 0);
        _ = FillConsoleOutputCharacter(hConsole, ' ', screenSize, topLeft, out _);
        _ = FillConsoleOutputAttribute(hConsole, csbi.wAttributes, screenSize, topLeft, out _);

        Console.SetCursorPosition(0, 0);
    }

    static void Main(string[] args)
    {
        for (int i = 0; i < 100; i++)
        {
            Console.WriteLine(i);
        }
        ClearConsole();
        Console.ReadKey();
    }
}

方法二：重置控制台缓冲区大小（简单快速，可能有轻微闪烁） #

通过临时缩小缓冲区高度丢弃回滚内容，清除后可恢复原设置：

static void ClearAllConsoleContent()
{
    int originalBufferHeight = Console.BufferHeight;
    int originalWindowHeight = Console.WindowHeight;

    try
    {
        Console.BufferHeight = Console.WindowHeight;
        Console.Clear();
        Console.BufferHeight = originalBufferHeight;
        Console.WindowHeight = originalWindowHeight;
    }
    catch (ArgumentOutOfRangeException)
    {
        Console.Clear();
    }
}

方法三：跨平台解决方案（支持Windows/Linux/macOS） #

利用ANSI控制序列清除全缓冲区，Windows需先启用终端ANSI支持：

static void ClearConsoleCrossPlatform()
{
    if (OperatingSystem.IsWindows())
    {
        // 启用Windows终端ANSI支持（Windows 10+默认已开启）
        Console.OutputEncoding = System.Text.Encoding.UTF8;
        _ = Console.WriteLine("\x1b[3J\x1b[H\x1b[2J");
    }
    else
    {
        // Linux/macOS终端直接发送ANSI序列
        Console.Write("\x1b[3J\x1b[H\x1b[2J");
    }
    Console.SetCursorPosition(0, 0);
}

内容的提问来源于stack exchange，提问作者Alex