Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Here is how to organize a message loop on a non-UI thread, to run asynchronous tasks like <code>WebBrowser</code> automation. It uses <a href="https://stackoverflow.com/tags/async-await/info"><code>async/await</code></a> to provide the convenient linear code flow and loads a set of web pages in a loop. The code is a ready-to-run console app which is partially based on <a href="https://stackoverflow.com/a/18675926/1768303">this excellent post</a>.</p> <p>Related answers:</p> <ul> <li><a href="https://stackoverflow.com/a/22262976/1768303">https://stackoverflow.com/a/22262976/1768303</a> </li> <li><a href="https://stackoverflow.com/a/21775343/1768303">https://stackoverflow.com/a/21775343/1768303</a></li> </ul> <p></p> <pre><code>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&lt;object&gt; DoWorkAsync(object[] args) { Console.WriteLine("Start working."); using (var wb = new WebBrowser()) { wb.ScriptErrorsSuppressed = true; TaskCompletionSource&lt;bool&gt; tcs = null; WebBrowserDocumentCompletedEventHandler documentCompletedHandler = (s, e) =&gt; tcs.TrySetResult(true); // navigate to each URL in the list foreach (var url in args) { tcs = new TaskCompletionSource&lt;bool&gt;(); 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&lt;object&gt; Run(Func&lt;object[], Task&lt;object&gt;&gt; worker, params object[] args) { var tcs = new TaskCompletionSource&lt;object&gt;(); var thread = new Thread(() =&gt; { EventHandler idleHandler = null; idleHandler = async (s, e) =&gt; { // 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(); } } } } </code></pre>
    singulars
    1. This table or related slice is empty.
    1. POWebBrowser Control in a new thread
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USNoseratio
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload