如何从网站获取类元素值？

Question

我有这个元素

<span class="validationMsg">
    <span id="TapuzLogin1_ctl01_UserNameRequired" title="יש להקליד שם משתמש" style="color:Red;display:none;">* יש להקליד שם משתמש<br>
    </span>
    <span id="TapuzLogin1_ctl01_PasswordRequired" title="יש להקליד סיסמה" style="color:Red;display:none;">* יש להקליד סיסמה<br>
    </span>שם המשתמש או הסיסמה אינם נכונים
</span>

类是“validationMsg” 我需要获取字符串的值在底部：

שם המשתמש או הסיסמה אינם נכונים

这是希伯来语。

我可以通过Id获取和使用

private void button1_Click(object sender, EventArgs e)
{
   navigate("mysite.net");
   webBrowser1.Document.GetElementById("UserName").InnerText = textBox1.Text.ToString();
   webBrowser1.Document.GetElementById("Password").InnerText = textBox2.Text.ToString();
   webBrowser1.Document.GetElementById("LoginButton").InvokeMember("click");
}

但是我如何获得类元素值这个希伯来语字符串表示我是否正常登录。 我想检查如果这个元素包含这个字符串那么登录是错误的。

这是我在 form1 中如何登录的完整代码。 如果我输入正确的用户名和密码，我就可以正常登录。 但是我怎样才能指出输入的密码或用户名是否错误？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using mshtml;
using HtmlAgilityPack;

namespace WebSite_Login_And_Browsing
{
    public partial class LogIn : Form
    {
        IHTMLDocument2 doc;
        string pagecontent;

        public LogIn()
        {
            InitializeComponent();

            webBrowser1.ScriptErrorsSuppressed = true;
        }

        public void ihtml(HtmlAgilityPack.HtmlDocument dom)
        {
            try
            {
                pagecontent = "";
                doc = webBrowser1.Document.DomDocument as IHTMLDocument2;
                pagecontent = doc.body.innerHTML;
                dom.LoadHtml(pagecontent);
            }
            catch (Exception)
            {
                dom.LoadHtml(webBrowser1.DocumentText.ToString());
            }

        }

        public void navigate(string url)
        {
            webBrowser1.Navigate(url);
            while (webBrowser1.ReadyState != WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            navigate("http://www.tapuz.co.il/Common/SignInPage.aspx?backUrl=http://www.tapuz.co.il/Common/SignIn.aspx@loginDone=1");

            webBrowser1.Document.GetElementById("UserName").InnerText = textBox1.Text.ToString();       webBrowser1.Document.GetElementById("Password").InnerText = textBox2.Text.ToString();          webBrowser1.Document.GetElementById("LoginButton").InvokeMember("click");
        }
    }
}

我在button1点击按钮事件中的代码

private void button1_Click(object sender, EventArgs e)
            {
navigate("http://www.tapuz.co.il/Common/SignInPage.aspx?backUrl=http://www.tapuz.co.il/Common/SignIn.aspx@loginDone=1");         webBrowser1.Document.GetElementById("TapuzLogin1_ctl01_UserName").InnerText = textBox1.Text.ToString();         webBrowser1.Document.GetElementById("TapuzLogin1_ctl01_Password").InnerText = textBox2.Text.ToString();       webBrowser1.Document.GetElementById("TapuzLogin1_ctl01_LoginButton").InvokeMember("click");
            }

文档完成事件

void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            var items = webBrowser1.Document.GetElementsByTagName("span");
            foreach (HtmlElement item in items)
            {
                if (item.GetAttribute("className") == "validationMsg")
                {
                    logingResults = item.InnerText;
                    if (logingResults.Contains("שם המשתמש או הסיסמה אינם נכונים"))
                        break;
                }
            }
        }

Answer 1

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using mshtml;
using HtmlAgilityPack;

namespace WebSite_Login_And_Browsing
{
    public partial class LogIn : Form
    {
        public LogIn()
        {
            InitializeComponent();

            webBrowser1.ScriptErrorsSuppressed = true;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            webBrowser1.DocumentCompleted += process1;
            webBrowser1.Navigate("http://www.tapuz.co.il/Common/SignInPage.aspx?backUrl=http://www.tapuz.co.il/Common/SignIn.aspx@loginDone=1");
        }

        private void process1(object sender, WebBrowserDocumentCompletedEventArgs args)
        {
            webBrowser1.DocumentCompleted -= process1;
            webBrowser1.DocumentCompleted += process2;

            try
            {
                webBrowser1.Document.GetElementById("UserName").InnerText = textBox1.Text.ToString();
                webBrowser1.Document.GetElementById("Password").InnerText = textBox2.Text.ToString();
                webBrowser1.Document.GetElementById("LoginButton").InvokeMember("click");
            }
            catch
            {
                webBrowser1.DocumentCompleted -= process2;
            }
        }

        private void process2(object sender, WebBrowserDocumentCompletedEventArgs args)
        {
            webBrowser1.DocumentCompleted -= process2;

            var items = webBrowser1.Document.GetElementsByTagName("span");
            foreach (HtmlElement item in items)
            {
                if (item.GetAttribute("className") == "validationMsg")
                {
                    if (item.InnerText.Contains("שם המשתמש או הסיסמה אינם נכונים"))
                    {
                        MessageBox.Show("State 1");
                        return;
                    }
                }
            }

            MessageBox.Show("State 2");
        }
    }
}

Answer 2

var items = webBrowser1.Document.GetElementsByTagName("span");
foreach (HtmlElement item in items)
{
    if (item.GetAttribute("className") == "validationMsg")
    {
        // Now you can check the item's value by comparing item.InnerText
    }
}

Answer 3

不确定你是否愿意使用 javascript 来获取文本。希望这个 sn-p 对你有所帮助

document.getElementsByClassName('validationMsg')[0].innerText

WORKING DEMO

如有遗漏请见谅