在C#中使用Scrcpy（一款用于在PC端控制安卓設備的工具）實現剪貼板同步需要以下步驟：

1. 使用Scrcpy庫連接到安卓設備。
2. 在PC端監聽剪貼板變化。
3. 將PC端剪貼板內容傳輸到安卓設備。
4. 在安卓設備上接收PC端的剪貼板內容并更新設備上的剪貼板內容。

以下是實現剪貼板同步的C#代碼示例：

using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Threading;

public class ClipboardSync
{
    [DllImport("user32.dll", SetLastError = true)]
    static extern IntPtr SetClipboardData(uint uFormat, IntPtr data);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool OpenClipboard(IntPtr hWndNewOwner);

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool CloseClipboard();

    [DllImport("user32.dll")]
    static extern IntPtr GetClipboardData(uint uFormat);

    [DllImport("user32.dll")]
    static extern uint RegisterClipboardFormat(string lpszFormat);

    [DllImport("user32.dll", EntryPoint = "SendMessage", SetLastError = true)]
    static extern IntPtr SendMessage(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

    private const int WM_CLIPBOARDUPDATE = 0x031D;
    private const uint CF_UNICODETEXT = 13;

    private static string clipboardData;

    public static void Main()
    {
        IntPtr hwnd = Process.GetCurrentProcess().MainWindowHandle;
        AddClipboardFormatListener(hwnd);

        while (true)
        {
            Thread.Sleep(1000);
            // Check if clipboard data has changed
            string currentClipboardData = GetClipboardData();
            if (currentClipboardData != clipboardData)
            {
                clipboardData = currentClipboardData;
                // Sync clipboard data to Android device using Scrcpy
                SyncClipboardToAndroid(clipboardData);
            }
        }
    }

    private static string GetClipboardData()
    {
        if (!OpenClipboard(IntPtr.Zero))
        {
            return null;
        }

        IntPtr clipboardDataPtr = GetClipboardData(CF_UNICODETEXT);
        if (clipboardDataPtr == IntPtr.Zero)
        {
            CloseClipboard();
            return null;
        }

        string clipboardData = Marshal.PtrToStringUni(clipboardDataPtr);
        CloseClipboard();
        return clipboardData;
    }

    private static void SyncClipboardToAndroid(string data)
    {
        // Implement syncing clipboard data to Android device using Scrcpy
        // Example: ADB shell command to set clipboard data on Android device
        string adbCommand = $"adb shell input text \"{data}\"";
        Process.Start(new ProcessStartInfo
        {
            FileName = "cmd",
            Arguments = $"/c {adbCommand}",
            CreateNoWindow = true,
            UseShellExecute = false
        });
    }

    private static void AddClipboardFormatListener(IntPtr hwnd)
    {
        ChangeWindowMessageFilter(WM_CLIPBOARDUPDATE, 1);
        SendMessage(hwnd, WM_CLIPBOARDUPDATE, IntPtr.Zero, IntPtr.Zero);
    }

    [DllImport("user32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool ChangeWindowMessageFilter(uint message, uint dwFlag);
}

這段代碼演示了如何在C#中監聽PC端剪貼板的變化并將其同步到Android設備上。需要注意的是，要將剪貼板內容同步到Android設備，可以使用類似于ADB命令等方式。