在C#中用鼠标画线的正确方法是什么

这是我的绘图代码，用于用鼠标在图表上绘制自定义线条。你能帮我以正确的方式做吗？

namespace Grafi
    {
        public partial class Form1 : Form
        {

            bool isDrawing = false;
            Point prevPoint;

            public Form1()
            {
                InitializeComponent();
            }

            private void chartTemperature_MouseDown(object sender, MouseEventArgs e)
            {
                isDrawing = true;
                prevPoint = e.Location;
            }

            private void chartTemperature_MouseMove(object sender, MouseEventArgs e)
            {
                Pen p = new Pen(Color.Red, 2); 
                if (isDrawing)
                {
                    Graphics g = chartTemperature.CreateGraphics();    
                    g.DrawLine(p, prevPoint, e.Location);
                    prevPoint = e.Location;

                    numOfMouseEvents = 0;              
                }
                p.Dispose();
            }

            private void chartTemperature_MouseUp(object sender, MouseEventArgs e)
            {
                isDrawing = false;
            }
        }
    }

问题是，当我调整大小时，我的行消失了。每当引发 onPaint 事件时它就会消失。

试试这个...这是一种笔画绘制方法，实现非常简单并且尽可能接近您自己的代码。斯托克斯是鼠标运动的单独集合。鼠标在向下和向上之间的每次移动都会记录为一次笔划，所有笔划都会被收集，然后在触发绘画事件时重新绘制。这个例子很简单，但可能是一个很好的起点。

请注意，您必须为图表对象添加绘制处理程序。

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using System.Drawing.Drawing2D;

namespace Grafi
{
    public partial class Form1 : Form
    {
        bool isDrawing;
        // our collection of strokes for drawing
        List<List<Point>> _strokes = new List<List<Point>>();
        // the current stroke being drawn
        List<Point> _currStroke;
        // our pen
        Pen _pen = new Pen(Color.Red, 2); 

        public Form1()
        {
            InitializeComponent();
        }

        private void chartTemperature_MouseDown(object sender, MouseEventArgs e)
        {
            isDrawing = true;
            // mouse is down, starting new stroke
            _currStroke = new List<Point>();
            // add the initial point to the new stroke
            _currStroke.Add(e.Location);
            // add the new stroke collection to our strokes collection
            _strokes.Add(_currStroke);
        }

        private void chartTemperature_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDrawing)
            {
                // record stroke point if we're in drawing mode
                _currStroke.Add(e.Location);
                Refresh(); // refresh the drawing to see the latest section
            }
        }

        private void chartTemperature_MouseUp(object sender, MouseEventArgs e)
        {
            isDrawing = false;
        }

        private void chartTemperature_Paint(object sender, PaintEventArgs e)
        {
            // now handle and redraw our strokes on the paint event
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            foreach (List<Point> stroke in _strokes.Where(x => x.Count > 1))
                e.Graphics.DrawLines(_pen, stroke.ToArray());
        }
    }
}