WinForm WebBrowser 设置IE版本

public enum IeVersion
{
    IE7 = ,
    IE8 = ,
    IE9 = ,
    IE10 = ,
    IE11 =
};　

/// <summary>
/// 修改注册表信息来兼容当前程序
/// </summary>
public static void SetWebBrowserFeatures(IeVersion ieVersion)
{
    if (LicenseManager.UsageMode != LicenseUsageMode.Runtime) return;
    //获取程序及名称
    string AppName = System.IO.Path.GetFileName(System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName);

    //得到浏览器的模式的值
    UInt32 ieMode = GeoEmulationModee((int)ieVersion);

    string featureControlRegKey = @"HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main\FeatureControl\";
    //设置浏览器对应用程序（appName）以什么模式（ieMode）运行  

    Registry.SetValue(featureControlRegKey + "FEATURE_BROWSER_EMULATION", AppName, ieMode, RegistryValueKind.DWord);

    Registry.SetValue(featureControlRegKey + "FEATURE_ENABLE_CLIPCHILDREN_OPTIMIZATION", AppName, , RegistryValueKind.DWord);
    Registry.SetValue(featureControlRegKey + "FEATURE_AJAX_CONNECTIONEVENTS", AppName, , RegistryValueKind.DWord);
    Registry.SetValue(featureControlRegKey + "FEATURE_GPU_RENDERING", AppName, , RegistryValueKind.DWord);
    Registry.SetValue(featureControlRegKey + "FEATURE_WEBOC_DOCUMENT_ZOOM", AppName, , RegistryValueKind.DWord);
    Registry.SetValue(featureControlRegKey + "FEATURE_NINPUT_LEGACYMODE", AppName, , RegistryValueKind.DWord);
}

/// <summary>
/// 通过版本得到浏览器模式的值
/// </summary>
/// <param name="browserVersion"></param>
/// <returns></returns>
private static UInt32 GeoEmulationModee(int browserVersion)
{
    UInt32 mode = ; // Internet Explorer 11. Webpages containing standards-based !DOCTYPE directives are displayed in IE11 Standards mode.
    switch (browserVersion)
    {
        case :
            mode = ; // Webpages containing standards-based !DOCTYPE directives are displayed in IE7 Standards mode.
            break;
        case :
            mode = ; // Webpages containing standards-based !DOCTYPE directives are displayed in IE8 mode.
            break;
        case :
            mode = ; // Internet Explorer 9. Webpages containing standards-based !DOCTYPE directives are displayed in IE9 mode.
            break;
        case :
            mode = ; // Internet Explorer 10.
            break;
        case :
            mode = ; // Internet Explorer 11
            break;
    }
    return mode;
}