Cefsharp rewrite default JS popup (alert/confirm/prompt)

1. Set JS pop-up window controller

Webview.jsdialoghandler = this; JS pop-up window control

2. Implementing the Interface method

    Public BOOLOnjsalert (Iwebbrowser Browser,stringUrlstringmessage)            {MessageBox.Show (message); return true;//Stop JS Bullets        }         Public unsafe BOOLOnjsconfirm (Iwebbrowser Browser,stringUrlstringMessageBOOL*retval) {DialogResult result= MessageBox.Show (Message,"Tips", Messageboxbuttons.yesno); BOOLValue = result = = Dialogresult.yes?true:false; //retval = (BOOL *) GCHandle.Alloc (value). Addrofpinnedobject (). ToPointer (); //get managed memory address, exception//retval = &value;//failed to change pointer*retval =value; return true; }         Public unsafe BOOLOnjsprompt (Iwebbrowser Browser,stringUrlstringMessagestringDefaultValue,BOOL* RetVal,ref stringresult) {            //Interactive Messages            stringR =string.            Empty;  This. Invoke (NewAction (() ={R= Microsoft.VisualBasic.Interaction.InputBox (Message,"Tips", DefaultValue);            })); Result=R; if(Result = =DefaultValue) {                *retval =false; }            Else            {                *retval =true; }            return true; }