写一段C#代码，输入雷达波形数据TXT文件，然后可以输出两种波形，点击button按钮可以转换波形，用基础语言写

首先，你需要安装一些基本的NuGet包来帮助读取文本文件和操作图表，这里假设已经安装了`System.IO`和`System.Windows.Forms.DataVisualization.Charting`。下面是一个简单的C# WinForms应用程序示例，它演示了如何做到这一点：

using System;
using System.Collections.Generic;
using System.IO;
using System.Windows.Forms;
using System.Windows.Forms.DataVisualization.Charting;

namespace RadarWaveformApp
{
    public partial class MainForm : Form
    {
        private List<double> radarData = new List<double>();
        private Series series1, series2; // 图表系列

        public MainForm()
        {
            InitializeComponent();
            InitializeSeries();
        }

        private void ReadRadarData(string filePath)
        {
            try
            {
                string[] lines = File.ReadAllLines(filePath);
                foreach (string line in lines)
                {
                    if (!string.IsNullOrEmpty(line))
                        radarData.Add(double.Parse(line));
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Error reading file: {ex.Message}");
            }
        }

        private void InitializeSeries()
        {
            chart1.Series.Clear();

            series1 = new Series("波形1");
            series1.ChartType = SeriesChartType.Line;
            series2 = new Series("波形2");
            series2.ChartType = SeriesChartType.StepLine;

            chart1.Series.Add(series1);
            chart1.Series.Add(series2);
        }

        private void btnSwitchWaveform_Click(object sender, EventArgs e)
        {
            switch (chart1.SelectedSeries.Name)
            {
                case "波形1":
                    chart1.Series["波形1"].Visible = false;
                    chart1.Series["波形2"].Visible = true;
                    break;
                case "波形2":
                    chart1.Series["波形1"].Visible = true;
                    chart1.Series["波形2"].Visible = false;
                    break;
            }
        }

        private void btnLoadFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog openFileDialog = new OpenFileDialog();
            openFileDialog.Filter = "Text Files (*.txt)|*.txt|All Files (*.*)|*.*";
            if (openFileDialog.ShowDialog() == DialogResult.OK)
            {
                ReadRadarData(openFileDialog.FileName);
                UpdateChartData();
            }
        }

        private void UpdateChartData()
        {
            chart1.Series["波形1"].Points.DataBindY(radarData);
            chart1.Series["波形2"].Points.Clear(); // 示例，实际波形可能需要特殊算法
            // 这里你可以根据需要对雷达数据进行分段或其他变换，然后填充series2
        }
    }
}

在这个例子中，有一个`btnLoadFile`按钮负责加载文本文件，`btnSwitchWaveform`按钮用于切换波形。记得在实际应用中替换`UpdateChartData`部分的代码，以适应你实际的雷达波形处理逻辑。