处置ChromiumWebBrowser时未关闭CefSharp.BrowserSubprocess [英] CefSharp.BrowserSubprocess are not closed when ChromiumWebBrowser is Disposed

问题描述

我在WPF中使用CefSharp 55。每次我创建新的 ChromiumWebBrowser 时，任务管理器中都会出现一个新的CefSharp.BrowserSubprocess.exe，这很正常。但是当我在 ChromiumWebBrowser 上调用 Dispose（）时，它们并不会消失。它们仅在我关闭Apllication时消失，这可能是因为当时我调用 Cef.Shutdown（）。在处置后，我尝试强制使用GC，但我什么也没做。

因此，如果用户在网络浏览器中不断打开和关闭标签页，我们最终会得到很多CefSharp

在扩展 ChromiumWebBrowser ，我愿意

  var requestContextSettings = new RequestContextSettings 
 {
 PersistSessionCookies = false，
 IgnoreCertificateErrors = true 
}; 
 
 RequestContext = new RequestContext（requestContextSettings）; 
  

在处置浏览器时，请

  browser.Dispose（）; 
 browser.RequestContext.Dispose（）
  

我忘了什么吗？

编辑

显然，该问题不仅限于CefSharp.BrowserSubprocess。当我放置浏览器播放youtube视频时，视频的声音仍在运行。之前工作正常，处置后视频声音被切断。也许这是我最近更新的新版本的CefSharp中的错误。

解决方案

我发现了问题所在。我做了一个 ILifeSpanHandler 的实现，在其中我在 DoClose（...）中返回了true，因为我虽然返回了true Mean您告诉浏览器可以关闭。但是在文档中说返回false会立即破坏浏览器。

（ https://github.com/cefsharp/CefSharp/blob/master/CefSharp/Handler/ILifeSpanHandler.cs ）

完成此操作后，CefSharp当我关闭相应的Web浏览器时，BrowserSubprocess关闭。

I am using CefSharp 55 in WPF. every time I make a new ChromiumWebBrowser, a new CefSharp.BrowserSubprocess.exe appear in the task manager, which is normal. But they don't disappear when I call Dispose() on a ChromiumWebBrowser. They only disappear when I close the Apllication, propably because at that time I call Cef.Shutdown(). I tried to Force GC after the dispose but i change nothing.

So if the user keep opening and closing tabs in the web browser, we end up with a lot of CefSharp.BrowserSubprocess running which will never be closed exept when the app is closed.

In the constructor of the class extending ChromiumWebBrowser,I do

var requestContextSettings = new RequestContextSettings
{
    PersistSessionCookies = false,
    IgnoreCertificateErrors = true
};

RequestContext = new RequestContext(requestContextSettings);

When I dispose the browser, do

browser.Dispose();
browser.RequestContext.Dispose()

Did I forgot something?

Edit

Apparently it the problem is not limited to CefSharp.BrowserSubprocess. When I dispose a browser playing a youtube video, The sound of the video is still running. It was working before, the video sound was cut after the dispose. Maybe it is a bug in the new version of CefSharp that I updated recently.

解决方案

I found what was the problem. I made an implementation of ILifeSpanHandler where I was returning true in DoClose(...) because I though returning true mean you tell the browser it can close. But in the doc it say to return false to destroy the browser immediatly.

(https://github.com/cefsharp/CefSharp/blob/master/CefSharp/Handler/ILifeSpanHandler.cs)

After doing this, The CefSharp.BrowserSubprocess are closed when I close the corresponding web browser.

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