c# - How to open web browser in a loop and enter data and wait until it fully loads -


i have c# form web browser control on it. want open url eg:(www. google.com)in loop , each time loop runs want first navigate url fill search string , click search button , wait until search results load fully.

how can this?

i wrote code save url after search result loads search result last string seems load , gets saved in list.

private void button1_click(object sender, eventargs e) {     var task = donavigationasync();     task.continuewith((t) =>     {         messagebox.show("done!");     }, taskscheduler.fromcurrentsynchronizationcontext()); }  private void webbrowser1_documentcompleted(object sender, webbrowserdocumentcompletedeventargs e) {     htmlelement url = webbrowser1.document.getelementbyid("sb_form_q");      if (url != null)     {         url.setattribute("value", search[searchindx-1]);         webbrowser1.document.getelementbyid("sb_form_go").invokemember("click");     }      if (webbrowser1.url.tostring() != "http://www.bing.com/")     {         savedurl.add(webbrowser1.url.tostring());     } }  async task donavigationasync() {     taskcompletionsource<bool> tcsnavigation = null;     taskcompletionsource<bool> tcsdocument = null;      this.webbrowser1.navigated += (s, e) =>     {         if (tcsnavigation.task.iscompleted)             return;         tcsnavigation.setresult(true);     };      this.webbrowser1.documentcompleted += (s, e) =>     {         if (this.webbrowser1.readystate != webbrowserreadystate.complete)             return;         if (tcsdocument.task.iscompleted)             return;         tcsdocument.setresult(true);     };     search = new string[3];     search[0] = "c";     search[1] = "c++";     search[2] = "c#";      searchindx = 0;      foreach (string sval in search)     {         searchindx++;         tcsnavigation = new taskcompletionsource<bool>();         tcsdocument = new taskcompletionsource<bool>();          webbrowser1.navigate("www.bing.com");          await tcsnavigation.task;          await tcsdocument.task;     } }

using async httpclient .net framework 4.5, can load web page without using gui element such webbrowser.

a download this:

using (httpclient client = new httpclient()) {     await client.getstringasync("https://google.com"); }

this html content of google search site.

but if want have resulting url, won't need perform download because google (and other search engines) provides api that. note following google url: https://www.google.com/search?q=google. can see search string "google" appears parameter named "q". if build code this...

string[] search = new string[] { "c", "c++", "c#" };  foreach (string sval in search) {     // c# <= 5     savedurl.add(string.format("https://google.com/search?q={0}", sval));     // c# 6     savedurl.add($"https://google.com/search?q={sval}"); }

... won't need web access.


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