[winform-webbrowser]-in HTML page JS call Winform class method

In the WinForm project to embed the Web page, want to call the background method through the HTML page, how to implement it? Actually very simple, there are three main parts:

1. Add the [ComVisible (true)] label to the called Method class, meaning that the current class can be used as a COM component for outsourcing calls

2. Set the class that can be called by the HTML page in the WebBrowser control: webbrowser1.objectforscripting = this; the front end can access the This object through window.external

3, the HTML page calls the background method: Window.External. Method Name (); The window.external here is equivalent to webbrowser1.objectforscripting

1  　　  //ComVisible Set External accessibility, you can use JS to access member methods in HTML2[ComVisible (true)]3      Public Partial classForm1:form4     {5          PublicForm1 ()6         {7 InitializeComponent ();8         }9 Ten         Private voidForm1_Load (Objectsender, EventArgs e) One         { A             //Browser. URL = new Uri ("https://www.baidu.com"); -Browser. URL =NewUri ("http://localhost:3133/index.html"); -Browser. ObjectForScripting = This; the         } -  -         Private voidbtnSearch_Click (Objectsender, EventArgs e) -         { +HtmlElement kw = Browser. document.all["kw"]; -HtmlElement btn = browser. document.all["su"]; +  A             stringTXT =TXTWD. Text.trim (); atkw. SetAttribute ("value", TXT); -Btn. InvokeMember ("Click"); -         } -  -         Private voidBtndo_click (Objectsender, EventArgs e) -         { in             int[] arr = {1, at }; -Browser. Document.invokescript ("F",New Object[] {"{ A-i}" }); to         } +  -          Public voidWinf (stringArg) the         { * MessageBox.Show (ARG); $         }Panax Notoginseng}

HTML code:

<! DOCTYPE Html>"Content-type"Content="text/html; Charset=utf-8"/> <title></title> <meta charset="Utf-8"/>"ext ()">external</button> <script>varf =function (msg) {//if ()Alert (Object.prototype.toString.call (msg)); }        //call a method in WinFormfunction ext () {//call a method in WinFormWindow.external.WinF ("Hello"); }        </script></body>
[winform-webbrowser]-in HTML page JS call Winform class method