WINCE上的手写签名,同样可应用于WINFORM.

using System;
using System.Linq;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace SmartDeviceProject1
{
    public partial class MobileTest : Form
    {

        List<Points> handTrack = new List<Points>();
        public Graphics pb_Graphics;
        Bitmap pb_BMP = new Bitmap(240, 268);//签名时图片的大小
        int index = 0;    //第几笔
         bool isDrawing = false;//用于在move时,只有在Down的时候才画.


        public MobileTest()
        {
            InitializeComponent();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            try
            {
                pb_Graphics = Graphics.FromImage((System.Drawing.Image)pb_BMP);//获取图片的Graphics
                pb_Graphics.Clear(this.BackColor);
                foreach (Points item in handTrack)
                {
                    if (item.PT.Count > 1)
                        pb_Graphics.DrawLines(new Pen(Color.Black), item.PT.ToArray());
                }
                e.Graphics.DrawImage(pb_BMP, 0, 0);//其实是在当前控件上写了一个图片
                pb_Graphics.Dispose();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            isDrawing = true;
            handTrack.Add(new Points());
            handTrack[index].PT.Add(new Point(e.X, e.Y));
            this.Refresh();
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (isDrawing == true)
            {
                handTrack[index].PT.Add(new Point(e.X, e.Y));
                this.Refresh();
            }
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            index++;
            isDrawing = false;
        }                //一个菜单按钮,用于清空当前的签名.

        private void menuItem1_Click(object sender, EventArgs e)
        {
            this.handTrack.Clear();
            index = 0;
            this.Refresh();
        }

 
    }

    class Points
    {
        public List<Point> PT = new List<Point>();
    }
}

在Paint的时候,用了当item.PT.count>1的时候才画,这是因为,这个方法只有在集合点数大于1的时候才正确,否则会出现参数错误的报错信息.

当然也可以在0<count<=1的时候,调用DrawLine来单独画点.

代码在CINCE 5.0 ,WINDOWS XP上测试通过.

使用VS2008,SDK为3.5