public void BeforeNavigate2(object pDisp, ref object urlObject, ref object flags, ref object targetFrameName, ref object postData, ref object headers, ref bool cancel)
{
Debug.Assert(_parent != null, "Parent should have been set");
//Note: we want to allow navigation if we haven't already navigated.
if (AllowNavigation || !_haveNavigated)
{
Debug.Assert(urlObject is null || urlObject is string, "invalid url type");
Debug.Assert(targetFrameName is null || targetFrameName is string, "invalid targetFrameName type");
Debug.Assert(headers is null || headers is string, "invalid headers type");
//
// If during running interop code, the variant.bstr value gets set
// to -1 on return back to native code, if the original value was null, we
// have to set targetFrameName and headers to string.Empty.
if (targetFrameName is null)
{
targetFrameName = string.Empty;
}
if (headers is null)
{
headers = string.Empty;
}
string urlString = urlObject is null ? string.Empty : (string)urlObject;
WebBrowserNavigatingEventArgs e = new WebBrowserNavigatingEventArgs(
new Uri(urlString), targetFrameName is null ? string.Empty : (string)targetFrameName);
_parent.OnNavigating(e);
cancel = e.Cancel;
}
else
{
cancel = true;
}
}