重新打开父窗体的Web浏览器所在的窗体时，不会调用DocumentCompleted

Question

我有一个父表单，其中另一个表单（其中子表单包含一个WebBrowswe）在URL导航中获得一些cookie，然后可视化验证码，一旦获得了cookie和验证码，我就通过网络请求将其发送给我，第一次尝试时一切正常，然后关闭并重新打开子窗体以再次执行此操作，但是不再获得调用cookie的第一个导航的DocumentCompleted，它停止工作，并检查该元素和ReadyStatus（如果它类似于“ COMPLETED”（完成）），我想知道为什么第二次调用子窗体而不调用DocumentCompleted，以便再次起作用，我必须重新打开完整的应用程序

这是我打开孩子表格的地方

private void obtenerDatos()
        {

        limpiarVariables();
        try
        {

            if (datos.Text.Length == 18)
            {
                Datos formDatos = new Datos();
                formDatos.peticion = "Obtener_Datos";
                formDatos.Dato = datos.Text;
                if (formDatos.ShowDialog() == DialogResult.OK)
                {
                    DATOS = formDatos.Datos;
                    mensaje = formDatos.mensaje;
                    if ((DATOS[0, 0] != null && DATOS[0, 1] != null) && mensaje == "Encontrado")
                    {

                        //obtnerVariables();
                    }
                    else if ((DATOS[0, 0] == null && DATOS[0, 1] == null) && mensaje == "No_Encontrado")
                    {

                    }
                    else if ((DATOS[0, 0] == null && DATOS[0, 1] == null) && mensaje == "Sin_Conexion")
                    {

                    }
                    else
                    {

                    }
                }
            }
            else
            {

            }
        }
        catch { }
    }

这是子窗体。

namespace Datos
{
    public partial class Datos : Form
    {
        public string peticion;
        public string[,] Datos = new string[33, 2];
        public string mensaje;
        public string name;
        public string value;
        public bool download = false;
        public string _session;
        public string _cookie;
        public bool _CookieGids;
        public string[] globalCookie;

    Byte[] _dPost;

    [DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
    static extern bool InternetGetCookieEx(string pchURL, string pchCookieName, StringBuilder pchCookieData, ref uint pcchCookieData, int dwFlags, IntPtr lpReserved);
    const int INTERNET_COOKIE_HTTPONLY = 0x00002000;

    public Datos()
    {
        InitializeComponent();
    }


    private bool conexion()
    {
        try
        {
            System.Net.IPHostEntry host = System.Net.Dns.GetHostEntry("www.google.com.mx");
            return true;
        }
        catch
        {
            return false;
        }
    }

    private void Datos_Load(object sender, EventArgs e)
    {
        webBrowser1.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser1_DocumentCompleted);
        cargarDatos();
    }

    private void webBrowser1_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        try
        {
            if(_CookieGids == true)
            {
                _CookieGids = false;
                GetGlobalCookies(webBrowser1.Document.Url.AbsoluteUri);

                var strurl = "https://captcha.com";
                titulo.Text = "Obteniendo captcha, por Favor espere...";
                webBrowser1.Navigate(strurl);
                progressBar1.Visible = true;
            }
            else
            {
                webBrowser1.Visible = true;
                titulo.Visible = false;
                if (peticion == "Obtener_Datos")
                {
                    //obtenerTags();
                }
            }
        }
        catch
        {

        }
    }

    private void cargarDatos()
    {
        try
        {
            string strurl = "";
            if (peticion == "Imprimir")
            {
                Dispose();
                this.Close();
            }

            if (conexion())
            {
                strurl = "https://captcha.com";
                //navego en la pagina.
                webBrowser1.Navigate(strurl);


                btnActualizarCatcha.PerformClick();
                txtCatcha.Focus();
                //var cookie = webBrowser1.head;
            }
            else
            {
                mensaje = "Sin_Conexion";
                this.Close();
            }
        }
        catch
        { }
    }

    private void UpdateProgressBar(int percentage)
    {
        // If on a worker thread, marshal the call to the UI thread
        if (progressBar1.InvokeRequired)
        {
            progressBar1.Invoke(new Action<int>(UpdateProgressBar), percentage);
        }
        else
        {
            progressBar1.Value = percentage;
        }
    }

    private void obtenerDatos()
    {
        try
        {

            var strurl = "";
            webBrowser1.Visible = true;
            //progressBar1.Visible = false;
            titulo.Visible = true;

            //webBrowser1.Visible = false;
            //titulo.Visible = true;
            //progressBar1.Visible = true;

            switch (peticion)
            {
                case "Obtener_Datos":
                    try
                    {
                        //muestro la barra de progreso.
                        titulo.Text = "Obteniendo Datos, por Favor espere...";
                        //limpio mi arrreglo de variables.
                        limpiarVariables();
                        strurl = "https://datos.com";
                        Uri target = new Uri(strurl);
                        var http = (HttpWebRequest)WebRequest.Create(strurl);

                        CookieContainer cookieJar = new CookieContainer();
                        var postData = "strDatos=" + Dato.Trim();
                        postData += "&strtipo=B";
                        postData += "&codigo="+txtCatcha.Text.Trim();
                        var data = Encoding.ASCII.GetBytes(postData);
                        foreach(var cookie in globalCookie)
                        {
                            var nameCookie = cookie.Substring(0, cookie.IndexOf("="));
                            var valueCookie = cookie.Substring(cookie.IndexOf("=")+1);
                            cookieJar.Add(new Cookie(nameCookie.Trim(), valueCookie.Trim()) { Domain = target.Host });
                        }
                        http.CookieContainer = cookieJar;
                        http.UseDefaultCredentials = true;
                        http.ContentLength = data.Length;
                        http.Proxy.Credentials = System.Net.CredentialCache.DefaultCredentials;
                        http.Method = "POST";
                        http.ContentType = @"application/x-www-form-urlencoded";
                        http.UserAgent = @"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36";
                        http.Accept = @"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3";
                        http.Referer = @"https://datos.com";
                        using (var streamPost = http.GetRequestStream())
                        {
                            streamPost.Write(data, 0, data.Length);
                        }
                        var response = http.GetResponse();

                        var stream = response.GetResponseStream();
                        var sr = new StreamReader(stream);
                        var content = sr.ReadToEnd();

                        leerHtml(content);
                    }
                    catch (Exception e)
                    {                          
                    }
                break;
            }
        }
        catch
        { }
    }

    public void GetGlobalCookies(string uri)
    {
        uint datasize = 1024;
        StringBuilder cookieData = new StringBuilder((int)datasize);
        if (InternetGetCookieEx(uri, null, cookieData, ref datasize, INTERNET_COOKIE_HTTPONLY, IntPtr.Zero)
            && cookieData.Length > 0)
        {
            char delimitador = ';';
            globalCookie = cookieData.ToString().Split(delimitador);
        }
        else
        {
            globalCookie =  null;
        }
    }

    private void webBrowser1_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
    {
        try
        {
            if((e.CurrentProgress != 0 && e.MaximumProgress != 0) && (e.CurrentProgress < e.MaximumProgress))
            {
                progressBar1.Value = (int)(((double)e.CurrentProgress / e.MaximumProgress) * 100);
            }
        }
        catch
        {

        }

    }

    private void Datos_FormClosed(object sender, FormClosedEventArgs e)
    {
        webBrowser1.Stop();
        if (mensaje != "Sin_Conexion")
        {
            if (Datos[0, 0] != null && Datos[0, 1] != "")
            {
                mensaje = "Encontrado";
            }
            else
            {
                mensaje = "No_Encontrado";
            }
        }
        DialogResult = DialogResult.OK;
    }

    private void button2_Click(object sender, EventArgs e)
    {
        try
        {
            string strurl = "https://cookie.com";
            titulo.Visible = true;
            titulo.Text = "Obteniendo permisos, por Favor espere...";
            _CookieGids = true;
            progressBar1.Visible = true;
            webBrowser1.Visible = true;
            webBrowser1.Navigate(strurl);
            webBrowser1.Refresh();
        }
        catch 
        { 
        }
    }

    private void button1_Click(object sender, EventArgs e)
    {
        this.Close();
    }

    private void btnObtenerDatos_Click(object sender, EventArgs e)
    {
        obtenerDatos();
    }

    private void txtCatcha_KeyPress(object sender, KeyPressEventArgs e)
    {
        if ((int)e.KeyChar == (int)Keys.Enter)
        {
            obtenerDatos();
        }
    }
}
}