How Can I Fix Frozen Ajax Calls in the C# WebBrowser Control?

C# Webbrowser control solution to AJAX calling problem

Many developers encountered a frustrating question when using the C# Webbrowser control: after clicking the button on the window, the control was frozen, and the "being dealing with your request" information indefinitely. This problem is caused by the behavior difference between the Webbrowser control and the complete Internet Explorer (IE) browser.

In order to solve this problem, we can use the "Feature Control", which is a mechanism that allows us to simulate the Webbrowser control behavior to get closer to the IE browser behavior. One of the key functions that need to be enabled is

, which sets the simulation mode of the browser. In addition, we can also enable other functions to enhance compatibility, such as

, FEATURE_BROWSER_EMULATION and FEATURE_AJAX_CONNECTIONEVENTS. FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION FEATURE_MANAGE_SCRIPT_CIRCULAR_REFS The following code fragments demonstrate how to set the browser function control key:

By setting these functional control keys, the Webbrowser control should be able to work together to work with the complete IE browser to solve the problem of the control frozen by the AJAX call. It should be noted that setting these keys does not require administrator permissions.

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);
    }
}

private void SetBrowserFeatureControl()
{
    // 在WebBrowser初始化之前实现您自己的功能集并注册它们

    SetBrowserFeatureControlKey("FEATURE_BROWSER_EMULATION", fileName, GetBrowserEmulationMode()); 
    SetBrowserFeatureControlKey("FEATURE_AJAX_CONNECTIONEVENTS", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION", fileName, 1);
    SetBrowserFeatureControlKey("FEATURE_MANAGE_SCRIPT_CIRCULAR_REFS", fileName, 1);
    // 根据需要添加其他功能

    public MainWindow()
    {
        SetBrowserFeatureControl();

        InitializeComponent();
    }
}

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