C# 使用ManualResetEvent和CancellationTokenSource、后台线程，实现后台数据获取（方法为GetValueData）和界面中的chart刷新(方法为GetChartData)功能的启动、暂停、继续和停止功能 给出完整程序

在C#中，你可以使用`ManualResetEvent`（MRE）来同步主线程和后台线程，`CancellationTokenSource`用于控制异步操作的取消，结合后台线程和UI更新，我们可以创建一个简单的示例。这里是一个基础的框架代码：

using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms.DataVisualization.Charting;

public partial class MainForm : Form
{
    private ManualResetEvent _dataReady = new ManualResetEvent(initialState: false);
    private CancellationTokenSource _cancellationTokenSource;
    private BackgroundWorker _backgroundWorker;
    private Chart _chart;

    public MainForm()
    {
        InitializeComponent();
        _chart = chart1; //假设图表控件已添加到Form上
    }

    private async void StartButton_Click(object sender, EventArgs e)
    {
        _cancellationTokenSource = new CancellationTokenSource();

        _backgroundWorker = new BackgroundWorker();
        _backgroundWorker.WorkerReportsProgress = true;
        _backgroundWorker.WorkerSupportsCancellation = true;
        _backgroundWorker.DoWork += GetValueData_DoWork;
        _backgroundWorker.ProgressChanged += GetValueData_ProgressChanged;
        _backgroundWorker.RunWorkerCompleted += GetValueData_RunWorkerCompleted;

        await Task.Run(() => GetChartDataAsync(), _cancellationTokenSource.Token);
    }

    private void GetValueData_DoWork(object sender, DoWorkEventArgs e)
    {
        GetValueData();
    }

    private void GetValueData_ProgressChanged(object sender, ProgressChangedEventArgs e)
    {
        _chart.Invalidate(); // 更新进度时手动刷新图表
    }

    private void GetValueData_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        _dataReady.Set(); // 数据获取完成后设置事件
    }

    private async Task GetChartDataAsync()
    {
        while (!_cancellationTokenSource.IsCancellationRequested)
        {
            await _dataReady.WaitOne(); // 等待数据准备就绪
            // 这里处理数据并计算图表数据
            UpdateChartData();
            _dataReady.Reset(); // 清除信号以便下一次等待
        }
    }

    private void UpdateChartData()
    {
        // 根据获取的数据填充或更新图表
        _chart.Series[0].Points.AddXY(DateTime.Now, DataValue); // 假设有一个DataValue变量
    }

    private void PauseButton_Click(object sender, EventArgs e)
    {
        if (_backgroundWorker.IsBusy)
        {
            _cancellationTokenSource.Cancel();
            _backgroundWorker.Paused = true;
        }
    }

    private void ResumeButton_Click(object sender, EventArgs e)
    {
        if (_backgroundWorker.IsBusy && !_backgroundWorker.CancellationPending)
        {
            _backgroundWorker.Resume();
        }
    }

    private void StopButton_Click(object sender, EventArgs e)
    {
        if (_backgroundWorker.IsBusy)
        {
            _cancellationTokenSource.Cancel();
            _backgroundWorker.Dispose();
            _backgroundWorker = null;
        }
    }

    ~MainForm() //析构函数确保清理资源
    {
        if (_cancellationTokenSource != null)
        {
            _cancellationTokenSource.Cancel();
        }
    }
}