这篇文章主要介绍了C# 利用Selenium实现浏览器自动化操作,帮助大家更好的理解和使用c#,感兴趣的朋友可以了解下
概述
Selenium是一款免费的分布式的自动化测试工具,支持多种开发语言,无论是C、 java、ruby、python、或是C# ,你都可以通过selenium完成自动化测试。本文以一个简单的小例子,简述C# 利用Selenium进行浏览器的模拟操作,仅供学习分享使用,如有不足之处,还请指正。
涉及知识点
要实现本例的功能,除了要掌握Html ,JavaScript,CSS等基础知识,还涉及以下知识点:
- log4net:主要用于日志的记录和存储,本例采用log4net进行日志记录,便于过程跟踪和问题排查,关于log4net的配置和介绍,之前已有说明,本文不做赘述。
- Queue:队列,先进先出模式,本文主要用于将日志信息保存于队列中,然后再显示到页面上,其中Enqueue用于添加内容到结尾处,Dequeue用于返回并移除一个位置的对象。
- IWebDriver:浏览器驱动接口,所有的关于浏览器的操作都可以通过此接口进行,不同浏览器有不同的实现类,如:IE浏览器(InternetExplorerDriver)Chrome浏览器(ChromeDriver)等。
- BackgroundWorker:后台工作线程,区别于主线程,通过事件触发不同的状态。
Selenium安装
本例开发工具为VS2019,通过NuGet进行需要的软件包的安装与管理,如下所示:
示例效果图
本例采用Chrome浏览器,用于监控某一个网站并获取相应内容,如下所示:
Selenium示例介绍
定义一个webDriver,如下所示:
//谷歌浏览器
ChromeOptions options = new ChromeOptions();
this.driver = new ChromeDriver(options);
通过ID获取元素并填充内容和触发事件,如下所示:
this.driver.FindElement(By.Id("email")).SendKeys(username);
this.driver.FindElement(By.Id("password")).SendKeys(password);
//# 7. 点击登录按钮
this.driver.FindElement(By.Id("sign-in")).Click();
通过XPath获取元素,如下所示:
string xpath1 = "//div[@class=\"product-list\"]/div[@class=\"product\"]/div[@class=\"price-and-detail\"]/div[@class=\"price\"]/span[@class=\"noStock\"]";
string txt = this.driver.FindElement(By.XPath(xpath1)).Text;
核心代码
主要的核心代码,就是浏览器的元素定位查找和事件触发,如下所示:
using OpenQA.Selenium;
using OpenQA.Selenium.IE;
using OpenQA.Selenium.Chrome;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace AiSmoking.Core
{
public class Smoking
{
/// <summary>
/// 是否正在运行
/// </summary>
private bool running = false;
/// <summary>
/// 驱动
/// </summary>
private IWebDriver driver = null;
/// <summary>
/// # 无货
/// </summary>
private string no_stock = "Currently Out of Stock";
/// <summary>
/// # 线程等待秒数
/// </summary>
private int wait_sec = 2;
private Dictionary<string, string> cfg_info;
private string work_path = string.Empty;
/// <summary>
/// 构造函数
/// </summary>
public Smoking()
{
}
/// <summary>
/// 带参构造函数
/// </summary>
/// <param name="cfg_info"></param>
/// <param name="work_path"></param>
public Smoking(Dictionary<string, string> cfg_info,string work_path)
{
this.cfg_info = cfg_info;
this.work_path = work_path;
this.wait_sec = int.Parse(cfg_info["wait_sec"]);
//# 如果小于2,则等于2
this.wait_sec = (this.wait_sec < 2 ? 2 : this.wait_sec);
this.wait_sec = this.wait_sec * 1000;
}
/// <summary>
/// 开始跑
/// </summary>
public void startRun()
{
//"""运行起来"""
try
{
this.running = true;
string url = this.cfg_info["url"];
string username = this.cfg_info["username"];
string password = this.cfg_info["password"];
string item_id = this.cfg_info["item_id"];
if (string.IsNullOrEmpty(url) || string.IsNullOrEmpty(username) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(item_id))
{
LogHelper.put("配置信息不全,请检查config.cfg文件是否为空,然后再重启");
return;
}
if (this.driver == null)
{
string explorer = this.cfg_info["explorer"];
if (explorer == "Chrome")
{
//谷歌浏览器
ChromeOptions options = new ChromeOptions();
this.driver = new ChromeDriver(options);
}
else
{
//默认IE
var options = new InternetExplorerOptions();
//options.AddAdditionalCapability.('encoding=UTF-8')
//options.add_argument('Accept= text / css, * / *')
//options.add_argument('Accept - Language= zh - Hans - CN, zh - Hans;q = 0.5')
//options.add_argument('Accept - Encoding= gzip, deflate')
//options.add_argument('user-agent=Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) like Gecko')
//# 2. 定义浏览器驱动对象
this.driver = new InternetExplorerDriver(options);
}
}
this.run(url, username, password, item_id);
}
catch (Exception e)
{
LogHelper.put("运行过程中出错,请重新打开再试"+e.StackTrace);
}
}
/// <summary>
/// 运行
/// </summary>
/// <param name="url"></param>
/// <param name="username"></param>
/// <param name="password"></param>
/// <param name="item_id"></param>
private void run(string url, string username, string password, string item_id)
{
//"""运行起来"""
//# 3. 访问网站
this.driver.Navigate().GoToUrl(url);
//# 4. 最大化窗口
this.driver.Manage().Window.Maximize();
if (this.checkIsExists(By.LinkText("账户登录")))
{
//# 判断是否登录:未登录
this.login(username, password);
}
if (this.checkIsExists(By.PartialLinkText("欢迎回来")))
{
//# 判断是否登录:已登录
LogHelper.put("登录成功,下一步开始工作了");
this.working(item_id);
}
else
{
LogHelper.put("登录失败,请设置账号密码");
}
}
/// <summary>
/// 停止运行
/// </summary>
public void stopRun()
{
//"""停止"""
try
{
this.running = false;
//# 如果驱动不为空,则关闭
//self.close_browser_nicely(self.__driver)
if (this.driver != null)
{
this.driver.Quit();
//# 关闭后切要为None,否则启动报错
this.driver = null;
}
}
catch (Exception e)
{
//print('Stop Failure')
}
finally
{
this.driver = null;
}
}
private void login(string username, string password)
{
//# 5. 点击链接跳转到登录页面
this.driver.FindElement(By.LinkText("账户登录")).Click();
//# 6. 输入账号密码
//# 判断是否加载完成
if (this.checkIsExists(By.Id("email")))
{
this.driver.FindElement(By.Id("email")).SendKeys(username);
this.driver.FindElement(By.Id("password")).SendKeys(password);
//# 7. 点击登录按钮
this.driver.FindElement(By.Id("sign-in")).Click();
}
}
/// <summary>
/// 工作状态
/// </summary>
/// <param name="item_id"></param>
private void working(string item_id)
{
while (this.running)
{
try
{
//# 正常获取信息
if (this.checkIsExists(By.Id("string")))
{
this.driver.FindElement(By.Id("string")).Clear();
this.driver.FindElement(By.Id("string")).SendKeys(item_id);
this.driver.FindElement(By.Id("string")).SendKeys(Keys.Enter);
}
//# 判断是否查询到商品
string xpath = "//div[@class=\"specialty-header search\"]/div[@class=\"specialty-description\"]/div[@class=\"gt-450\"]/span[2] ";
if (this.checkIsExists(By.XPath(xpath)))
{
int count = int.Parse(this.driver.FindElement(By.XPath(xpath)).Text);
if (count < 1)
{
Thread.Sleep(this.wait_sec);
LogHelper.put("没有查询到item id =" + item_id + "对应的信息");
continue;
}
}
else
{
Thread.Sleep(this.wait_sec);
LogHelper.put("没有查询到item id2 =" + item_id + "对应的信息");
continue;
}
//# 判断当前库存是否有货
string xpath1 = "//div[@class=\"product-list\"]/div[@class=\"product\"]/div[@class=\"price-and-detail\"]/div[@class=\"price\"]/span[@class=\"noStock\"]";
if (this.checkIsExists(By.XPath(xpath1)))
{
string txt = this.driver.FindElement(By.XPath(xpath1)).Text;
if (txt == this.no_stock)
{
//# 当前无货
Thread.Sleep(this.wait_sec);
LogHelper.put("查询一次" + item_id + ",无货");
continue;
}
}
//# 链接path1
string xpath2 = "//div[@class=\"product-list\"]/div[@class=\"product\"]/div[@class=\"imgDiv\"]/a";
//# 判断是否加载完毕
//# this.waiting((By.CLASS_NAME, "imgDiv"))
if (this.checkIsExists(By.XPath(xpath2)))
{
this.driver.FindElement(By.XPath(xpath2)).Click();
Thread.Sleep(this.wait_sec);
//# 加入购物车
if (this.checkIsExists(By.ClassName("add-to-cart")))
{
this.driver.FindElement(By.ClassName("add-to-cart")).Click();
LogHelper.put("加入购物车成功,商品item-id:" + item_id);
break;
}
else
{
LogHelper.put("未找到加入购物车按钮");
}
}
else
{
LogHelper.put("没有查询到,可能是商品编码不对,或者已下架");
}
Thread.Sleep(this.wait_sec);
}
catch (Exception e)
{
Thread.Sleep(this.wait_sec);
LogHelper.put(e);
}
}
}
/// <summary>
/// 判断是否存在
/// </summary>
/// <param name="by"></param>
/// <returns></returns>
private bool checkIsExists(By by)
{
try
{
int i = 0;
while (this.running && i < 3)
{
if (this.driver.FindElements(by).Count > 0)
{
break;
}
else
{
Thread.Sleep(this.wait_sec);
i = i + 1;
}
}
return this.driver.FindElements(by).Count > 0;
}
catch (Exception e)
{
LogHelper.put(e);
return false;
}
}
}
}
关于日志帮助类,代码如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using log4net;
[assembly: log4net.Config.XmlConfigurator(Watch = true)]
namespace AiSmoking.Core
{
/// <summary>
/// 日志帮助类
/// </summary>
public static class LogHelper
{
/// <summary>
/// 日志实例
/// </summary>
private static ILog logInstance = LogManager.GetLogger("smoking");
private static Queue<string> queue = new Queue<string>(2000);
public static void put(string msg)
{
queue.Enqueue(msg);
WriteLog(msg, LogLevel.Info);
}
public static void put(Exception ex)
{
WriteLog(ex.StackTrace, LogLevel.Error);
}
public static string get()
{
if (queue.Count > 0)
{
return queue.Dequeue();
}
else
{
return string.Empty;
}
}
public static void WriteLog(string message, LogLevel level)
{
switch (level)
{
case LogLevel.Debug:
logInstance.Debug(message);
break;
case LogLevel.Error:
logInstance.Error(message);
break;
case LogLevel.Fatal:
logInstance.Fatal(message);
break;
case LogLevel.Info:
logInstance.Info(message);
break;
case LogLevel.Warn:
logInstance.Warn(message);
break;
default:
logInstance.Info(message);
break;
}
}
}
public enum LogLevel
{
Debug = 0,
Error = 1,
Fatal = 2,
Info = 3,
Warn = 4
}
}
作者:Alan.hsiang
出处:http://www.cnblogs.com/hsiang/
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本文标题为:C# 利用Selenium实现浏览器自动化操作的示例代码
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