C#给WebBrowser设置Cookie,从WebBrowser获取Cookie的方法

        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);
        private void setCookieStringToWebBrowser(string url)   //设置 cookie 给 webBrowser  并打开 url
        {
            InternetSetCookie(url, "offical.signin", "id=114858&key=0fe23af6-a8d0-4b02-bc3a-09f74f430ff2");
            InternetSetCookie(url, "CCUUID", "51952591582295158211582295159");
            // InternetSetCookie(url, "Cookie_Name", "Cookie_Value");

            webBrowser1.Navigate(url);
        }

        [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
        static extern bool InternetGetCookieEx(string pchUrl, string pchCookieName, StringBuilder pchCookieData, ref System.UInt32 pcchCookieData, int dwFlags, IntPtr lpReserved);
        private static string GetCookieString(string url)  // 从 webBrowser 获取 cookie，一般在webBrowser的 DocumentCompleted中获取
        {
            uint datasize = 1024;
            StringBuilder cookieData = new StringBuilder((int)datasize);
            if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x2000, IntPtr.Zero))
            {
                if (datasize < 0)
                    return null;
                cookieData = new StringBuilder((int)datasize);
                if (!InternetGetCookieEx(url, null, cookieData, ref datasize, 0x00002000, IntPtr.Zero))
                    return null;
            }
            return cookieData.ToString();
        }

        private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            if (e.Url.ToString().Contains("https://lot.ys998888.com"))   //监测要获取cookie的url
            {
                MessageBox.Show("Contains lot.ys998888.com");
                richTextBox1.AppendText(GetCookieString("https://lot.ys998888.com") + "\r\n");
                // 调用 GetCookieString 获取 cookie 
            }
        }

setCookieStringToWebBrowser  给 webBrowser 设置 cookie

GetCookieString 从 webBrowser  获取 cookie