等待网页加载到Webbrowser C＃中

Question

I have a program that testing the web page - clicking on the web elements. I'm using the C# WebBrowswer control and I have a problem before inserting the text in the text field, I want to wait for the page to load. for wait for the page to load, I'm using :

  while (true) { System.Windows.Forms.Application.DoEvents(); foreach (HtmlElement el in web_Browser.Document.GetElementsByTagName("р")) { if (el.GetAttribute("title") == "Custom") != null) { break; } } } 

but I get an error in the line: var elmC = web_Browser.Document.GetElementsByTagName("input"); "unreachable code detected"

  public void GetStatus(string innerText) { try { while (true) { System.Windows.Forms.Application.DoEvents(); foreach (HtmlElement el in web_Browser.Document.GetElementsByTagName("р")) { if (el.GetAttribute("title") == "Custom") != null) { break; } } } var elmC = web_Browser.Document.GetElementsByTagName("input"); foreach (HtmlElement elm in elmC) { if (elm.Id == "num") { elm.InnerText = String.Empty; Wait(1); elm.InnerText = innerText; } } } catch (Exception ex) { MessageBox.Show("Error " + ex.Message); } } 

Answer 1

Your break; statement is only going to break out of the foreach loop, not the while(true) loop, so that loop will run forever, any code after is unreachable...

Maybe try something like :

var run = true;

 while (run)
                {
                    System.Windows.Forms.Application.DoEvents();
                    foreach (HtmlElement el in web_Browser.Document.GetElementsByTagName("р"))
                    {
                        if (el.GetAttribute("title") == "Custom") != null)
                        {
                           run = false;
                        }
                    }
                }

But usually any code that reads " while() { // check async operation } " is generally bad ... Consider using an event or Thread.sleep() perhaps