CSV数据异步刷新到UI（DataGridView），zedGraph绘制曲线

步骤：

1、选择文件夹，读取文件夹。

2、通过线程遍历文件以及解析csv文件，将csv的一行行数据保存到Queue 队列。

　　csv文件数据模式：0.1668056,-0.569,-0.598

3、异步委托调用队列中的数据

　　后台解析与UI界面不干扰，这样就解决了数据太多页面卡死的问题了，不影响用户使用。

　　队列真的很神奇，再也不怕重复数据的读取，定位啥的，用一个少一个......

4、绘制曲线，自动累计，动态画图

　　使用zedGraph控件，比vs自带控件chart功能强大，需要自行下载 zedGraph.dll 文件，拖拽至工具箱即可

5、展示DataGridView行号

灵感来源：使用多线程加载多个Xml文件到TreeView控件

例子：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;
using System.IO;
using System.Threading;
using ZedGraph;

namespace ThreadsOpenCsvFilesTwo
{
    public partial class Form1 : Form
    {
        private Thread QueueFileThread;//定义一个线程，用来监视读取的文件队列 
        private delegate void csvDelegate(string instr);
        private Queue QueueFile = new Queue();//放置要加载的数据，数据模式：0.1668056,-0.569,-0.598

        public Form1()
        {
            InitializeComponent();
            
        }

        /// <summary>
        /// 委托的实现方法
        /// </summary>
        /// <param name="strLine"></param>
        private void csvDel(string strLine)
        {
            string[] aryLine = strLine.Split(',');
            dataGridView1.Rows.Add(aryLine);
            dataGridView1.Refresh();
        }
                
        /// <summary>
        /// QueueFileThread 线程调用的方法 
        /// </summary>
        /// <param name="obj"></param>
        private void analysis(object obj)
        {
            string path = obj.ToString();// 文件
            DirectoryInfo theFolder = new DirectoryInfo(path);
            //遍历文件
            foreach (FileInfo NextFile in theFolder.GetFiles())
            {
                string fileName = NextFile.Name;//获取到的只是文件的名字，不是路径
                string stype = fileName.Substring(fileName.LastIndexOf("."));
                if (stype == ".csv")
                {
                    string filepPath = NextFile.FullName;
                    FileStream fs = new FileStream(filepPath, FileMode.Open);
                    StreamReader sr = new StreamReader(fs, Encoding.UTF8);
                    bool IsFirst = false;//是否读取第一行
                    string strLine = "";
                    //逐行读取CSV中的数据
                    while ((strLine = sr.ReadLine()) != null)
                    {
                        if (IsFirst == false)
                        {
                            IsFirst = true;
                        }
                        else
                        {
                            QueueFile.Enqueue(strLine);
                        }
                    }
                }
            }
            
        }

        

        private void timer1_Tick(object sender, EventArgs e)
        {
            csvDelegate cd = new csvDelegate(csvDel);
            if (QueueFile.Count > 0)
            {
                this.BeginInvoke(cd, QueueFile.Dequeue());// UI线程异步委托

            }

            this.zedGraphControl1.GraphPane.CurveList.Clear();//清空之前画的图
            this.zedGraphControl1.GraphPane.AxisChange();// 更新
            GraphPane myPane = this.zedGraphControl1.GraphPane;
            this.zedGraphControl1.GraphPane.Title.Text = "折线图";
            myPane.XAxis.Title.Text = "Sequence";// 顺序
            myPane.YAxis.Title.Text = "Time";
            myPane.Y2Axis.Title.Text = "Front, Back";
            myPane.Y2Axis.IsVisible = true;//显示第二个y轴

            // 数据
            List<double> column1 = new List<double>();// y
            List<double> column2 = new List<double>();// y2
            List<double> column3 = new List<double>();// y3
            List<double> column4 = new List<double>();// x

            for (int i = 0; i < this.dataGridView1.Rows.Count - 1; i++)
            {
                DataGridViewRow row = new DataGridViewRow();
                row = dataGridView1.Rows[i];
                column1.Add(double.Parse(row.Cells["Time"].Value.ToString()));
                column2.Add(double.Parse(row.Cells["Front"].Value.ToString()));
                column3.Add(double.Parse(row.Cells["Back"].Value.ToString()));
                column4.Add(i + 1);
            }

            double[] y = column1.ToArray();
            double[] y2 = column2.ToArray();
            double[] y3 = column3.ToArray();
            double[] x = column4.ToArray();

            // Fill the axis background with a color gradient
            myPane.Chart.Fill = new Fill(Color.FromArgb(255, 255, 245), Color.FromArgb(255, 255, 190), 90F);

            // 生成曲线
            LineItem myCurve = myPane.AddCurve("Time", x, y, Color.Blue, SymbolType.None);
            LineItem myCurve2 = myPane.AddCurve("Front", x, y2, Color.Orange, SymbolType.None);
            myCurve2.IsY2Axis = true;  //手动改为按【Y2Axis】的刻度描画 
            LineItem myCurve3 = myPane.AddCurve("Back", x, y3, Color.Red, SymbolType.None);
            myCurve3.IsY2Axis = true;

            // 手动设置x y y2 轴的范围
            myPane.XAxis.Scale.Min = 0;
            myPane.YAxis.Scale.Min = 0;
            myPane.YAxis.Scale.Max = 200;
            myPane.Y2Axis.Scale.Min = -1;
            myPane.Y2Axis.Scale.Max = 2;

            // 显示Y轴网格线
            myPane.YAxis.MajorGrid.IsVisible = true;
            myPane.YAxis.MinorGrid.IsVisible = true;
            myPane.Y2Axis.MajorGrid.IsVisible = true;
            myPane.Y2Axis.MinorGrid.IsVisible = true;

            zedGraphControl1.AxisChange();
            zedGraphControl1.Invalidate();  
        }

        
        private void dataGridView1_RowStateChanged(object sender, DataGridViewRowStateChangedEventArgs e)
        {
            e.Row.HeaderCell.Value = string.Format("{0}", e.Row.Index + 1); //dataGridView显示行号
        }

        private void button1_Click_1(object sender, EventArgs e)
        {
            dataGridView1.Rows.Clear();
            FolderBrowserDialog dialog = new FolderBrowserDialog();
            dialog.Description = "请选择CSV所在文件夹";
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                if (string.IsNullOrEmpty(dialog.SelectedPath))
                {
                    MessageBox.Show(this, "文件夹路径不能为空", "提示");
                    return;
                }
                string path = dialog.SelectedPath;
                textBox1.Text = path;
                QueueFileThread = new Thread(new ParameterizedThreadStart(this.analysis));
                QueueFileThread.IsBackground = true;// 设置为后台线程
                QueueFileThread.Start(path);

                timer1.Start();
            }
        }
    }
}

展示结果：