Wsrtjtyk

I want to use CefSharp to make a POST web api call in Win Forms c#.

I have Basic Authentication for my POST request. But if I run the code I get the error on line IFrame frame = browser.GetMainFrame();:

Browser is not yet initialized. Use the IsBrowserInitializedChanged
event and check the IsBrowserInitialized property to determine when
the browser has been intialized.

Is there a way to resolve the same?

Following is my code:

public partial class Form1 : Form

{



    ChromiumWebBrowser browser = null;

    public Form1()

    {

        InitializeComponent();



        Cef.Initialize(new CefSettings());

        browser = new ChromiumWebBrowser("http://ctstest.azurewebsites.net/api/default");

        this.Controls.Add(browser);

        browser.Dock = DockStyle.Fill;



        PostTest.Navigate(browser, "http://ctstest.azurewebsites.net/api/default", null, "application/json");



    }

}



public static class PostTest

    {

    public static void Navigate(this IWebBrowser browser, string url, byte postDataBytes, string contentType)

    {

        IFrame frame = browser.GetMainFrame();

        IRequest request = frame.CreateRequest();



        request.Url = url;

        request.Method = "POST";



        request.InitializePostData();

        var element = request.PostData.CreatePostDataElement();

        element.Bytes = postDataBytes;

        request.PostData.AddElement(element);



        NameValueCollection headers = new NameValueCollection();

        headers.Add("Content-Type", contentType);

        request.Headers = headers;



        frame.LoadRequest(request);



        frame.GetTextAsync().ContinueWith(taskHtml =>

        {

            var html = taskHtml.Result;

            System.Windows.Forms.MessageBox.Show(html);

        });



        string script = string.Format("document.documentElement.outerHTML;");

        frame.EvaluateScriptAsync(script).ContinueWith(x =>

        {

            var response = x.Result;



            if (response.Success && response.Result != null)

            {

                var fullhtml = response.Result;

                System.Windows.Forms.MessageBox.Show(fullhtml.ToString());

            }

        });

    }



}

}

Thanks.

Well like the error message is telling you, you should check if the browser is already initialized.

I don't know the implementation of the class ChromiumWebBrowser but I would try to first navigate to the desired url

browser.navigate(yourUrl);

and maybe check if the browser has already navigated to your url by subscribing to the event IsBrowserInitialized before calling browser.GetMainFrame() (like amaitland mentioned)