WebBrowser控件在一个新的线程

我有一个列表Uri的，我想要“点击”为了实现这个我试图创build一个新的Web浏览器控制每个Uri。我创build一个新的线程每Uri。我遇到的问题是线程结束之前的文档是完全加载的，所以我从来没有得到使用DocumentComplete事件。我该如何克服这一点？

var item = new ParameterizedThreadStart(ClicIt.Click); var thread = new Thread(item) {Name = "ClickThread"}; thread.Start(uriItem); public static void Click(object o) { var url = ((UriItem)o); Console.WriteLine(@"Clicking: " + url.Link); var clicker = new WebBrowser { ScriptErrorsSuppressed = true }; clicker.DocumentCompleted += BrowseComplete; if (String.IsNullOrEmpty(url.Link)) return; if (url.Link.Equals("about:blank")) return; if (!url.Link.StartsWith("http://") && !url.Link.StartsWith("https://")) url.Link = "http://" + url.Link; clicker.Navigate(url.Link); } 

Answer 1

你必须创build一个STA消息循环的STA线程。 这是像WebBrowser这样的ActiveX组件的唯一好客的环境。 否则，您将不会获得DocumentCompleted事件。 一些示例代码：

 private void runBrowserThread(Uri url) { var th = new Thread(() => { var br = new WebBrowser(); br.DocumentCompleted += browser_DocumentCompleted; br.Navigate(url); Application.Run(); }); th.SetApartmentState(ApartmentState.STA); th.Start(); } void browser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) { var br = sender as WebBrowser; if (br.Url == e.Url) { Console.WriteLine("Natigated to {0}", e.Url); Application.ExitThread(); // Stops the thread } } 

Answer 2

以下是如何在非UI线程上组织消息循环，以运行WebBrowser自动化等asynchronous任务。 它使用async/await来提供方便的线性代码stream，并在循环中加载一组网页。 代码是一个准备运行的控制台应用程序，部分基于这个优秀的职位 。

相关答案：

• https://stackoverflow.com/a/22262976/1768303
• https://stackoverflow.com/a/21775343/1768303

 using System; using System.Threading; using System.Threading.Tasks; using System.Windows.Forms; namespace ConsoleApplicationWebBrowser { // by Noseratio - https://stackoverflow.com/users/1768303/noseratio class Program { // Entry Point of the console app static void Main(string[] args) { try { // download each page and dump the content var task = MessageLoopWorker.Run(DoWorkAsync, "http://www.example.com", "http://www.example.net", "http://www.example.org"); task.Wait(); Console.WriteLine("DoWorkAsync completed."); } catch (Exception ex) { Console.WriteLine("DoWorkAsync failed: " + ex.Message); } Console.WriteLine("Press Enter to exit."); Console.ReadLine(); } // navigate WebBrowser to the list of urls in a loop static async Task<object> DoWorkAsync(object[] args) { Console.WriteLine("Start working."); using (var wb = new WebBrowser()) { wb.ScriptErrorsSuppressed = true; TaskCompletionSource<bool> tcs = null; WebBrowserDocumentCompletedEventHandler documentCompletedHandler = (s, e) => tcs.TrySetResult(true); // navigate to each URL in the list foreach (var url in args) { tcs = new TaskCompletionSource<bool>(); wb.DocumentCompleted += documentCompletedHandler; try { wb.Navigate(url.ToString()); // await for DocumentCompleted await tcs.Task; } finally { wb.DocumentCompleted -= documentCompletedHandler; } // the DOM is ready Console.WriteLine(url.ToString()); Console.WriteLine(wb.Document.Body.OuterHtml); } } Console.WriteLine("End working."); return null; } } // a helper class to start the message loop and execute an asynchronous task public static class MessageLoopWorker { public static async Task<object> Run(Func<object[], Task<object>> worker, params object[] args) { var tcs = new TaskCompletionSource<object>(); var thread = new Thread(() => { EventHandler idleHandler = null; idleHandler = async (s, e) => { // handle Application.Idle just once Application.Idle -= idleHandler; // return to the message loop await Task.Yield(); // and continue asynchronously // propogate the result or exception try { var result = await worker(args); tcs.SetResult(result); } catch (Exception ex) { tcs.SetException(ex); } // signal to exit the message loop // Application.Run will exit at this point Application.ExitThread(); }; // handle Application.Idle just once // to make sure we're inside the message loop // and SynchronizationContext has been correctly installed Application.Idle += idleHandler; Application.Run(); }); // set STA model for the new thread thread.SetApartmentState(ApartmentState.STA); // start the thread and await for the task thread.Start(); try { return await tcs.Task; } finally { thread.Join(); } } } } 

Answer 3

从我以前的经验看，webbrowser不喜欢在主应用程序线程之外运行。

尝试使用httpwebrequests来代替，您可以将它们设置为asynchronous，并为响应创build一个处理程序以了解它何时成功：

如何使用的，HttpWebRequest的净asynchronous

Answer 4

一个简单的解决scheme，几个WebBrowser同时操作发生

1. 创build一个新的Windows窗体应用程序
2. 放置名为button1的button
3. 放置名为textBox1的文本框
4. 设置文本字段的属性：Multiline true和ScrollBars Both

5. 编写下面的button1点击处理程序：

    textBox1.Clear(); textBox1.AppendText(DateTime.Now.ToString() + Environment.NewLine); int completed_count = 0; int count = 10; for (int i = 0; i < count; i++) { int tmp = i; this.BeginInvoke(new Action(() => { var wb = new WebBrowser(); wb.ScriptErrorsSuppressed = true; wb.DocumentCompleted += (cur_sender, cur_e) => { var cur_wb = cur_sender as WebBrowser; if (cur_wb.Url == cur_e.Url) { textBox1.AppendText("Task " + tmp + ", navigated to " + cur_e.Url + Environment.NewLine); completed_count++; } }; wb.Navigate("https://stackoverflow.com/questions/4269800/webbrowser-control-in-a-new-thread"); } )); } while (completed_count != count) { Application.DoEvents(); Thread.Sleep(10); } textBox1.AppendText("All completed" + Environment.NewLine);