WinForm制作定时显示基金净值的桌面小工具

基金网每隔一分钟会更新净值估算，每次要打开网站看挺麻烦的，于是制作了一个桌面小工具，在桌面顶层并且透明显示，每隔一分钟抓取数据显示。
净值估算例子如下：
http://fund.eastmoney.com/000167.html

开发完成后的结果如下：

开发过程：

1、参考了“.net winForm 实现类似qq 弹出新闻一文”的窗体美化效果，放了两个Panel当背景和标题栏

http://www.cnblogs.com/echosong/p/3500563.html

2、在中间放一个Label显示信息、在工具栏拉一个ContextMenuStrip和NotifyIcon作为最小化到托盘时的显示和退出菜单操作，其中notifyIcon1的ContextMenuStrip属性设为contextMenuStrip1,Icon属性设为本地一个IOCN图标文件。

3、通过HtmlAgilityPack解析html源码得到所需的数据。

<div id="statuspzgz" class="fundpz"><span class="green bold">1.1843</span><div id="statuszdf" class="fundzf"><p class="green">-0.0067</p><p class="green">-0.56%</p></div><p class="time">2014-03-06 15:00</p></div>

解析用到的路径为：
//div[@id='statuspzgz']/span
//div[@id='statuszdf']/p[1]
//div[@id='statuszdf']/p[2]
//div[@id='statuspzgz']/p[@class='time']

完整代码如下：

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 HtmlAgilityPack;
using System.Threading.Tasks;
using System.Threading;
using System.Runtime.InteropServices;

namespace Demo
{
    public partial class Form8 : Form
    {
        const string url = "http://fund.eastmoney.com/000167.html";
        public Form8()
        {
            InitializeComponent();
            lblInfo.Text = "";           
            this.ShowInTaskbar = false;//任务栏不显示
            this.Opacity = 0.60;//透明度
            this.TopMost = true;//顶层显示

            Task.Factory.StartNew(() => Do(cts));
        }
       
        CancellationTokenSource cts = new CancellationTokenSource();
      
        private void Do(CancellationTokenSource cts)
        {
            while (!cts.IsCancellationRequested)
            {
                string html = Utils.GetHtmlSource(url, Encoding.UTF8);
                if (string.IsNullOrEmpty(html)) return;

                HtmlNode rootNode = null;
                HtmlAgilityPack.HtmlDocument document = new HtmlAgilityPack.HtmlDocument();
                document.LoadHtml(html);
                rootNode = document.DocumentNode;

                string s1 = GetNodeText(rootNode, "//div[@id='statuspzgz']/span");
                string s2 = GetNodeText(rootNode, "//div[@id='statuszdf']/p[1]");
                string s3 = GetNodeText(rootNode, "//div[@id='statuszdf']/p[2]");
                string s4 = GetNodeText(rootNode, "//div[@id='statuspzgz']/p[@class='time']");
                this.SafeCall(() =>
               {
                   lblInfo.Text = s1 + "\r\n" + s2 + "\r\n" + s3 + "\r\n" + s4;
               });
               Thread.Sleep(1000 * 60); //每隔60s查询
            }
        }
        private string GetNodeText(HtmlNode rootNode, string path)
        {
            HtmlNode temp = rootNode.SelectSingleNode(path);
            if (temp != null)
                return temp.InnerText;
            return "";
        }
        [DllImport("user32.dll")]
        //方法扑捉
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;
        void Panel2MouseDown(object sender, MouseEventArgs e)
        {
            //扑捉事件
            ReleaseCapture();
            //发送消息给window Api 来实现
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);//
        }
        private void label2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        /// <summary>  
        /// 隐藏窗体，并显示托盘图标  
        /// </summary>  
        private void HideForm()
        {
            this.Visible = false;
            this.WindowState = FormWindowState.Minimized;
            notifyIcon1.Visible = true;
        }

        /// <summary>  
        /// 显示窗体  
        /// </summary>  
        private void ShowForm()
        {
            this.Visible = true;
            this.WindowState = FormWindowState.Normal;
            notifyIcon1.Visible = false;
        }

        private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
        {
            ShowForm();
        }

        private void ToolStripMenuItemShow_Click(object sender, EventArgs e)
        {
            ShowForm();
        }

        private void toolStripMenuItemExit_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void label1_Click(object sender, EventArgs e)
        {
            HideForm();
        }
    }
}

其中GetHtmlSource方法可以参考另一文章：

C#采集CSDN单个博客所有文章
http://blog.csdn.net/gdjlc/article/details/11620915