After opening multiple web pages many times, freezing often occurs - cefsharp

Question

I am developing a web crawler that will frequently request new web pages. During the testing process, the program often freezes.
I've written a test case that explains my usage and the scenario where the problem has occurred.
Sometimes, when it open a web page for 10 times, it may get stuck when it open it for 20 times. How many times do it open the web page, i are not sure.
using CefSharp;
using CefSharp.WinForms;
using System;
using System.Windows.Forms;
namespace WindowsFormsApp2
{
public partial class Form1 : Form
{
ChromiumWebBrowser browser;
System.Timers.Timer timer;
int i = 1;
public Form1()
{
InitializeComponent();
timer = new System.Timers.Timer(400) { AutoReset = true };//Timer, automatically open a new web page
timer.Elapsed += Timer_Elapsed;
browser = new ChromiumWebBrowser("www.baidu.com") { Parent = splitContainer1.Panel1, Dock = DockStyle.Fill };
browser.LifeSpanHandler = new LifeSpanHandler(splitContainer1.Panel2);
browser.FrameLoadEnd += Browser_FrameLoadEnd;
}
private void Browser_FrameLoadEnd(object sender, FrameLoadEndEventArgs e)
{
if (e.Frame.IsMain == false) return;
timer.Start();
}
private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
{
i = i > 1 ? 1 : i + 1;
browser.ExecuteScriptAsync("document.getElementsByClassName('mnav c-font-normal c-color-t')[" + (i) + "].click()");//Open a link in the web page
}
}
class LifeSpanHandler : ILifeSpanHandler
{
Control host;
internal LifeSpanHandler(Control host)
{
this.host = host;
}
public bool DoClose(IWebBrowser chromiumWebBrowser, IBrowser browser)
{
return false;
}
public void OnAfterCreated(IWebBrowser chromiumWebBrowser, IBrowser browser)
{
}
public void OnBeforeClose(IWebBrowser chromiumWebBrowser, IBrowser browser)
{
}
public bool OnBeforePopup(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, string targetUrl, string targetFrameName, WindowOpenDisposition targetDisposition, bool userGesture, IPopupFeatures popupFeatures, IWindowInfo windowInfo, IBrowserSettings browserSettings, ref bool noJavascriptAccess, out IWebBrowser newBrowser)
{
newBrowser = null;
var webBrowser = (ChromiumWebBrowser)chromiumWebBrowser;
webBrowser.Invoke(new Action(() =>
{
if (host.HasChildren) host.Controls[0].Dispose();
var control = new Control { Parent = host, Dock = DockStyle.Fill };
control.CreateControl();
windowInfo.SetAsChild(control.Handle);
}));
return false;
}
}
}
The test code is placed on GitHub, which is the visual studio 2019 project. We hope you can execute the project locally, so as to find problems more intuitively. Thank you very much.
https://github.com/haohaodz/cefsharp-form-vs2019-problem.git

Answer 1

Have you tested with other websites?
High frequency of requests to other websites can also lead to deadlock.
Does the problem reproduce with github.com/cefsharp/CefSharp.MinimalExample
the problem does not reproduce with github.com/cefsharp/CefSharp.MinimalExample.
in BrowserTabUserControl.cs
browser.LifeSpanHandler = new LifeSpanHandler(openPopupsAsTabs: false);
It opens a web page in a new window by default.High frequency of open multiple web pages, the freezing problem does not reproduce.
I change openPopupsAsTabs to true and open a new page in tabs
browser.LifeSpanHandler = new LifeSpanHandler(openPopupsAsTabs: true);
High frequency of open multiple web pages, the program will freezes.
The program freezes in the dispose method:
System.Windows.Forms .dll! System.Windows.Forms . UnsafeNativeMethods.DestroyWindow (
System.Runtime.InteropServices . handleref hWnd) unknown
System.Windows.Forms .dll! System.Windows.Forms . NativeWindow.DestroyHandle () unknown
System.Windows.Forms .dll! System.Windows.Forms . Control.DestroyHandle () unknown
System.Windows.Forms .dll! System.Windows.Forms . Control.Dispose (bool disposing) unknown
System.dll ! System.ComponentModel.Component . dispose() unknown
Sometimes the program exits suddenly,There is an exception:
Exception thrown:“ System.IO.PipeException ”(located at System.ServiceModel.dll (2)
Exception thrown:“ System.ServiceModel.CommunicationException ”(located at System.ServiceModel.dll (2)
Exception thrown:“ System.ServiceModel.CommunicationException ”(located at System.ServiceModel.dll (2)
Exception thrown:“ System.ServiceModel.CommunicationException ”(located at System.ServiceModel.dll (2)
Exception thrown:“ System.ServiceModel.CommunicationException ”(located at System.ServiceModel.Internals . DLL)
Exception thrown:“ System.ServiceModel.CommunicationException ”(located at System.ServiceModel.Internals . DLL)
Exception thrown:“ System.ServiceModel.CommunicationObjectFaultedException ”(located at System.ServiceModel.dll (2)