Clear all cookies from WebView

问题

I am currently developing an application for Windows Phone 10 using UWP, in which I need a WebView that will set up several cookies in the process. The WebView can be instantiated many times, and I have noticed that the cookies do not get cleared on multiple instantiations, which makes it a bit difficult for my workflow (say, for instance, a user has to log in using the WebView, then when re-instantiating, the old state will be there).

I have tried using the clearTemporaryWebDataAsync to now avail. What is worse is that I don't know in advance the domains associated to the cookies, so I cannot do something like this:

HttpBaseProtocolFilter myFilter = new HttpBaseProtocolFilter();
HttpCookieManager cookieManager = myFilter.CookieManager;
HttpCookieCollection myCookieJar = cookieManager.GetCookies(new Uri("https://url.com"));
foreach (HttpCookie cookie in myCookieJar)
{
cookieManager.DeleteCookie(cookie);
}

Is there anything in the API that might help me wipe out all the cookies for the WebView, or at least get a list of them so that then I can use DeleteCookie on each?

回答1:

What is worse is that I don't know in advance the domains associated to the cookies, so I cannot do something like this:

AFAIK, there is no more method for clearing cache data except ClearTemporaryWebDataAsync. But the code snippet you provided do clear cookies. For what you consider about don't know in advance the domains to the cookies, you may get the current navigating Uri by the WebViewNavigationStartingEventArgs of NavigationStarting event handle. For example,

private void WebViewControl2_NavigationStarting(WebView sender, WebViewNavigationStartingEventArgs args)
{
    Uri gotouri = args.Uri;
    HttpBaseProtocolFilter myFilter = new HttpBaseProtocolFilter();
    HttpCookieManager cookieManager = myFilter.CookieManager;
    HttpCookieCollection myCookieJar = cookieManager.GetCookies(gotouri);
    foreach (HttpCookie cookie in myCookieJar)
    {
        cookieManager.DeleteCookie(cookie);
    }
}

And this will clear the cookies of current Uri. But this will clear the cookies every time the WebView naviagation. You may need to set a flag to ensure if the WebView is new instance depending on your app logic.

Another thing, in apps compiled for Windows 10, WebView uses the Microsoft Edge rendering engine to display HTML content. Clear cookies of current WebView instance may also clear others, which is same as you found cookies still exists when you have a new instance.

来源：https://stackoverflow.com/questions/43128225/clear-all-cookies-from-webview

标签

webview

uwp