Скачать или смотреть How to Manage Multiple Instances of CefSharp.BrowserSubprocess.exe When Using User Controls in WPF

Learn how to effectively manage multiple instances of `CefSharp.BrowserSubprocess.exe` in your WPF application and solve session storage issues.
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Understanding the Issue with CefSharp.BrowserSubprocess.exe

In the world of WPF applications, it's not uncommon to run into performance issues or unexpected behavior when using embedded web browsers like CefSharp. One common problem developers face is the appearance of multiple instances of CefSharp.BrowserSubprocess.exe each time a user control is loaded. This can lead to significant resource consumption and can cause session storage to reset, thereby losing vital data. In this post, we'll break down the problem and discuss potential solutions to enhance the behavior of your WPF application.

The Problem

When you navigate through your application and load a user control that utilizes the CefSharp browser component, you may notice the following:

Multiple Process Creation: Each load of your user control initiates a new CefSharp.BrowserSubprocess.exe instance.

Session Storage Management: These new instances seem to lose session data, meaning that your application doesn’t maintain the state of the web pages accurately.

Here's a simplified version of the scenario:

The application calls the OnLoad method to load a URL.

A new CefSharp process is created each time you navigate.

Cookie management is compromised, leading to incorrect data loading.

This could be due to incorrect handling of the browser lifecycle or insufficient management of cookies and session storage.

Breakdown of the Solutions

CefSharp and Process Creation

According to insights from community discussions, having multiple instances of CefSharp.BrowserSubprocess.exe is typical and often expected behavior, especially when the user control is being instantiated repeatedly. However, there are strategies you can use to mitigate issues arising from this behavior.

Improving the Code

Check for Existing Instances: Before creating a new instance of the browser, you can check if an existing instance is already running to avoid unnecessary process creation. This might require restructuring how you manage control loading.

Use Singleton Pattern for the Browser: Consider implementing a singleton pattern for your browser instance so that it remains the same across different loads of the user control. This can prevent the continuous spawning of subprocesses.

Cookie and Session Management: Ensure cookie management is done correctly and that you are not resetting cookies on every load. The following adjustments might help:

Set cookies at a global level rather than during each view load.

Utilize the Cef.GetGlobalCookieManager() once and persist the settings to prevent reinitialization.

Suggested Code Changes

Here’s how you might refactor part of your ServiceJournalsView control:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By rethinking how your WPF application handles CefSharp.BrowserSubprocess.exe instances, you can significantly improve performance and maintain session integrity. Use the strategies discussed to minimize resource consumption and manage session data more effectively. Continuous refinement of your code and understanding the underlying mechanisms will ultimately lead to a more efficient and user-friendly application.

If you find yourself struggling with keeping session storage across loads in your WPF application using CefSharp, consider implementing these suggestions. With a bit of adjustment, you can ensure a seamless experience for your users.