How to Fix Unresponsive C# WebBrowser Control During Ajax Calls?

C# Webbrowser control and Ajax call

Problem description

When using a webbrowser control in C# WPF .NET 4 applications, click the button to respond without response. The page shows the message "Your request is being processed" to prevent the page from continuing to process. This problem does not occur using the complete IE browser.

Problem analysis

WPF and WinForms Webbrowser controls are significantly different from the complete IE browser in behavior. These differences may cause script compatibility issues. Solution

The behavior of the Webbrowser control is consistent with the IE browser by implementing functional control. This involves setting specific functions, such as Feature_browser_emortion, which can be implemented without administrator permissions.

code example

How to use the example

deployment

private void SetBrowserFeatureControlKey(string feature, string appName, uint value)
{
    using (var key = Registry.CurrentUser.CreateSubKey(
        String.Concat(@"Software\Microsoft\Internet Explorer\Main\FeatureControl\", feature),
        RegistryKeyPermissionCheck.ReadWriteSubTree))
    {
        key.SetValue(appName, (UInt32)value, RegistryValueKind.DWord);
    }
}

In order to ensure that this change is effective, the necessary functions should be registered before the webbrowser initialization, usually in the constructor of the main window.

private void SetBrowserFeatureControl()
{
    // 获取进程特定设置
    var fileName = System.IO.Path.GetFileName(Process.GetCurrentProcess().MainModule.FileName);

    // 确保控件不在Visual Studio设计器中运行
    if (String.Compare(fileName, "devenv.exe", true) == 0 || String.Compare(fileName, "XDesProc.exe", true) == 0)
        return;

    SetBrowserFeatureControlKey("FEATURE_BROWSER_EMULATION", fileName, GetBrowserEmulationMode()); // IE10 标准模式，适用于具有基于标准的 !DOCTYPE 指令的页面。
    SetBrowserFeatureControlKey("FEATURE_AJAX_CONNECTIONEVENTS", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_MANAGE_SCRIPT_CIRCULAR_REFS", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_DOMSTORAGE", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_GPU_RENDERING", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_IVIEWOBJECTDRAW_DMLT9_WITH_GDI", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_DISABLE_LEGACY_COMPRESSION", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_LOCALMACHINE_LOCKDOWN", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_BLOCK_LMZ_OBJECT", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_BLOCK_LMZ_SCRIPT", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_DISABLE_NAVIGATION_SOUNDS", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_SCRIPTURL_MITIGATION", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_SPELLCHECKING", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_STATUS_BAR_THROTTLING", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_TABBED_BROWSING", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_VALIDATE_NAVIGATE_URL", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_WEBOC_DOCUMENT_ZOOM", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_WEBOC_POPUPMANAGEMENT", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_WEBOC_MOVESIZECHILD", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_ADDON_MANAGEMENT", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_WEBSOCKET", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_WINDOW_RESTRICTIONS", fileName, 0);
    SetBrowserFeatureControlKey("FEATURE_XMLHTTP", fileName, 1);
}

private UInt32 GetBrowserEmulationMode()
{
    int browserVersion = 7;
    using (var ieKey = Registry.LocalMachine.OpenSubKey(@"SOFTWARE\Microsoft\Internet Explorer",
        RegistryKeyPermissionCheck.ReadSubTree,
        System.Security.AccessControl.RegistryRights.QueryValues))
    {
        var version = ieKey.GetValue("svcVersion");
        if (null == version)
        {
            version = ieKey.GetValue("Version");
            if (null == version)
                throw new ApplicationException("需要安装Microsoft Internet Explorer!");
        }
        int.TryParse(version.ToString().Split('.')[0], out browserVersion);
    }

    UInt32 mode = 11000; // IE11 标准模式
    switch (browserVersion)
    {
        case 7:
            mode = 7000; // IE7 标准模式
            break;
        case 8:
            mode = 8000; // IE8 模式
            break;
        case 9:
            mode = 9000; // IE9 模式
            break;
        case 10:
            mode = 10000; // IE10 模式
            break;
        default:
            // 默认使用 IE11 模式
            break;
    }

    return mode;
}

More comprehensive feature settings

For more comprehensive functions, please refer to the update answer provided in the relevant link.

This Revied Output Maintains The Original Image and USES MORE NATURAL LANGUAGE WHILE PARAPHRASING The Content. Propriate to Paraphrase Code.

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