C# 实时快速更改用户代理

我正在我的

Winform

项目中使用

CefSharp

，我只想更改特定浏览器的用户代理

我通过使用自定义

IRequestHandler

并在其中设置用户代理来实现这一点：

class IGRequestHandler : IRequestHandler
{
    public bool CanGetCookies(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request)
    {
        return true;
    }

    public bool CanSetCookie(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, Cookie cookie)
    {
        return true;
    }

    public bool GetAuthCredentials(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, bool isProxy, string host, int port, string realm, string scheme, IAuthCallback callback)
    {
        callback.Dispose();
        return false;
    }

    public IResponseFilter GetResourceResponseFilter(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response)
    {
        return null;
    }

    public bool OnBeforeBrowse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, bool userGesture, bool isRedirect)
    {
        return false;
    }

    public CefReturnValue OnBeforeResourceLoad(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IRequestCallback callback)
    {
        var headers = request.Headers;
        headers["User-Agent"] = "Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1";
        request.Headers = headers;
        return CefReturnValue.Continue;
    }

    public bool OnCertificateError(IWebBrowser chromiumWebBrowser, IBrowser browser, CefErrorCode errorCode, string requestUrl, ISslInfo sslInfo, IRequestCallback callback)
    {
        callback.Dispose();
        return false;
    }

    public bool OnOpenUrlFromTab(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, string targetUrl, WindowOpenDisposition targetDisposition, bool userGesture)
    {
        return false;
    }

    public void OnPluginCrashed(IWebBrowser chromiumWebBrowser, IBrowser browser, string pluginPath)
    {

    }

    public bool OnProtocolExecution(IWebBrowser chromiumWebBrowser, IBrowser browser, string url)
    {
        return false;
    }

    public bool OnQuotaRequest(IWebBrowser chromiumWebBrowser, IBrowser browser, string originUrl, long newSize, IRequestCallback callback)
    {
        callback.Dispose();
        return false;
    }

    public void OnRenderProcessTerminated(IWebBrowser chromiumWebBrowser, IBrowser browser, CefTerminationStatus status)
    {

    }

    public void OnRenderViewReady(IWebBrowser chromiumWebBrowser, IBrowser browser)
    {

    }

    public void OnResourceLoadComplete(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, UrlRequestStatus status, long receivedContentLength)
    {

    }

    public void OnResourceRedirect(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response, ref string newUrl)
    {

    }

    public bool OnResourceResponse(IWebBrowser chromiumWebBrowser, IBrowser browser, IFrame frame, IRequest request, IResponse response)
    {
        return false;
    }

    public bool OnSelectClientCertificate(IWebBrowser chromiumWebBrowser, IBrowser browser, bool isProxy, string host, int port, System.Security.Cryptography.X509Certificates.X509Certificate2Collection certificates, ISelectClientCertificateCallback callback)
    {
        callback.Dispose();
        return false;
    }
}

当我加载这个页面时，我仍然会得到网站的常规版本，而不是移动版本

当我使用以下命令更改useragent时：

var settings = new CefSettings();

settings.CachePath = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData) + @"\CEF";
settings.IgnoreCertificateErrors = true;
settings.WindowlessRenderingEnabled = true;
settings.SetOffScreenRenderingBestPerformanceArgs();
settings.UserAgent = "Mozilla/5.0 (iPhone; CPU iPhone OS 10_0_1 like Mac OS X) AppleWebKit/602.1.50 (KHTML, like Gecko) Version/10.0 Mobile/14A403 Safari/602.1";

Cef.Initialize(settings, performDependencyCheck: false, browserProcessHandler: null);

我正在获取移动版，但我希望实时完成，而不是针对每个浏览器

以下是我实现浏览器的方式：

instaBrowser = new ChromiumWebBrowser("");
instaBrowser.RequestHandler = new IGRequestHandler();

instaBrowser.Dock = DockStyle.Fill;
instaBrowser.FrameLoadEnd += webViewFrameLoadEnd;
instaBrowser.LoadError += getFromBrowser_LoadError;

instaBrowser.BrowserSettings.Plugins = CefState.Disabled;
instaBrowser.BrowserSettings.WebGl = CefState.Disabled;
instaBrowser.BrowserSettings.RemoteFonts = CefState.Disabled;
instaBrowser.BrowserSettings.WindowlessFrameRate = 1;

instaBrowser.JsDialogHandler = new JsDialogHandler();

instaPanel.Controls.Add(instaBrowser);

---

这真的很痛苦，但似乎：

browser.GetDevToolsClient().Emulation.SetUserAgentOverrideAsync("");

即使已创建浏览器对象，也会成功更改useragent

例如，我有一个方法，处理“OnIsBrowserInitializedChanged”事件：

当我这样做的时候：

browser = new ChromiumWebBrowser("https://www.whatismybrowser.com/detect/what-is-my-user-agent");

---

该站点显示的字符串与我输入的字符串完全相同。

主题之前已经讨论过很多次，请参阅GetDevToolsClient返回一个实现IDisposable的实例，因此应该包装在using块中或手动调用dispose。您需要使用版本85或更高版本才能使用它。非常好，谢谢。我很快在中添加了一个指向此答案的链接

browser = new ChromiumWebBrowser("https://www.whatismybrowser.com/detect/what-is-my-user-agent");