Xilium.cefglue CEF Chrome Auto upload file does not pop up dialog box Cefdialoghandler

The key code below, how to use handler, still unclear please continue to search

Internal sealed classWyzcefdialoghandler:cefdialoghandler
{
protected override bool Onfiledialog (Cefbrowser Browser, Ceffiledialogmode mode, string title, String DefaultFilePath, St Ring[] acceptfilters, int selectedacceptfilter, Ceffiledialogcallback callback)
{
String[] Filepaths=new string[1];
filepaths[0]= @ "D:\Temp\Help_files\2016072213550813.png";
callback. Continue (0, filepaths);
return True;//return False;--false is a matter of cancellation.
}
}

Xilium.cefglue CEF Chrome Auto upload file does not pop up dialog box Cefdialoghandler