如何使用CEFSharp访问元素？ [英] How to access elements with CEFSharp?
问题描述
我是第一次使用CEFSharp C＃，并且我很难解决如何使浏览器执行除browser.Load（）;之外的任何事情。
我一直在搜索许多网站，时间又小时，似乎没人能找到答案或有这个问题。我试图访问网站元素，就像它们是c＃表单控件一样。我不应该问广泛的问题...我该怎么做 browser.Click（ / * elementName * /）这样的事情？另外，还有没有办法像 browser.TextBox1.Text = blah; 吗？
I am working with CEFSharp C# for the first time and im having a hard time figuring out how to make the browser do anything but browser.Load("");
I have been searching many websites for hours and hours and nobody seems to have an answer or have this problem. I am trying to access the website elements as if they were c# form controls... in a nutshell. I'm not supposed to ask broad questions... how would I do something like browser.Click("/*elementName*/")? Is Also, is there no way to do something like browser.TextBox1.Text = "blah";?
@Jim W
我到目前为止的代码：更新2018年6月6日4:29 pm
my code so far: updated 6/6/2018 4:29 pm
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 CefSharp;
using CefSharp.WinForms;
namespace WebAppWorkAround
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitializeChromium();
}
List<string> classList = new List<string>();
public ChromiumWebBrowser chromeBrowser;
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void InitializeChromium()
{
CefSettings settings = new CefSettings();
Cef.Initialize(settings);
chromeBrowser = new ChromiumWebBrowser("https://en.wikipedia.org/wiki/Main_Page");
this.panel1.Controls.Add(chromeBrowser);
chromeBrowser.Dock = DockStyle.Fill;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
Cef.Shutdown();
}
public string extract;
private void button1_Click(object sender, EventArgs e)
{
string EvaluateJavaScriptResult;
var frame = chromeBrowser.GetMainFrame();
var task = frame.EvaluateScriptAsync("(function() { return document.getElementById('aaa').value; })();", null);
task.ContinueWith(t =>
{
if (!t.IsFaulted)
{
var response = t.Result;
EvaluateJavaScriptResult = response.Success ? (response.Result ?? "null") : response.Message;
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}
}
}
错误：
错误CS1061'任务'不包含'结果'的定义，也没有扩展方法'会发现结果接受类型为任务的第一个参数（您是否缺少using指令或程序集引用？）（第61行）
Error CS1061 'Task' does not contain a definition for 'Result' and no extension method 'Result' accepting a first argument of type 'Task' could be found (are you missing a using directive or an assembly reference?) (line 61)
错误CS0266无法隐式将类型对象转换为字符串。存在显式转换（您是否缺少强制转换？）（第62行）
Error CS0266 Cannot implicitly convert type 'object' to 'string'. An explicit conversion exists (are you missing a cast?) (line 62)
推荐答案
它看起来并不像就像调用
It doesn't look like it's going to be as straightforward as calling
browser.TextBox1.Text = "blah";
据我所知，CEFSharp是一种从C＃包装程序执行Javascript的方法。它不是DOM的C＃版本（这就是它所需要的）。
As I understand it, CEFSharp is a way to execute Javascript from the C# wrapper. It's not a C# version of the DOM (which is what it'd need to be).
因此，从Github Wiki，我会说您需要使用此代码
So, from the Github wiki I would say you need to use this code
string EvaluateJavaScriptResult;
var frame = chromeBrowser.GetMainFrame();
var task = frame.EvaluateScriptAsync("(function() { return document.getElementById('<textBoxElementID>').value; })();", null);
task.ContinueWith(t =>
{
if (!t.IsFaulted)
{
var response = t.Result;
EvaluateJavaScriptResult = response.Success ? (response.Result.ToString() ?? "null") : response.Message;
}
}, TaskScheduler.FromCurrentSynchronizationContext());
然后 EvaluateJavaScriptResult 中应包含
这是一个完整的示例，设计人员只需要一个Panel（panel1）和一个Button（button1）：
Here's a complete working example, the designer just needs a Panel (panel1) and a Button (button1):
运行它，在搜索框中输入内容（在Wikipedia中），然后单击按钮，您应该会看到一个带有搜索框内容的消息框
Run it, type something in the search box (in Wikipedia), and then hit the button, you should see a messagebox with the content of the search box
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 CefSharp;
using CefSharp.WinForms;
namespace WindowsFormsApp1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
InitializeChromium();
}
List<string> classList = new List<string>();
public ChromiumWebBrowser chromeBrowser;
private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
}
private void Form1_Load(object sender, EventArgs e)
{
}
private void InitializeChromium()
{
CefSettings settings = new CefSettings();
Cef.Initialize(settings);
chromeBrowser = new ChromiumWebBrowser("https://en.wikipedia.org/wiki/Main_Page");
this.panel1.Controls.Add(chromeBrowser);
chromeBrowser.Dock = DockStyle.Fill;
}
private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{
Cef.Shutdown();
}
public string extract;
private void button1_Click(object sender, EventArgs e)
{
string EvaluateJavaScriptResult;
var frame = chromeBrowser.GetMainFrame();
var task = frame.EvaluateScriptAsync("(function() { return document.getElementById('searchInput').value; })();", null);
task.ContinueWith(t =>
{
if (!t.IsFaulted)
{
var response = t.Result;
EvaluateJavaScriptResult = response.Success ? (response.Result.ToString() ?? "null") : response.Message;
MessageBox.Show(EvaluateJavaScriptResult);
}
}, TaskScheduler.FromCurrentSynchronizationContext());
}
}
}
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