How to: Inject CoreWebView2.ExecuteScriptAsync ?

Question

Thanks ;

I want to Inject a .jsscript into Navigation Completed Event . 
This is as close as I have gotten so far .

        private void webView_NavigationCompleted(object sender, CoreWebView2NavigationCompletedEventArgs e)
        {
//            string htmlDoc = await webView.CoreWebView2.ExecuteScriptAsync("document.documentElement.outerHTML");
//            infoBox.Text = htmlDoc;
        }
```Is there a WebView2 example somewhere for this ;   
Pls , how can I do this ?      
Thanks  

Answer 1

Hi Vernon,

Thank you for posting this issue in Microsoft Q&A forum.

As you know, the await operator can only be used within an async method, so if you want to use it in private void webView_NavigationCompleted(XXXXX) event, you probably need to add async in the codes, like this private async void webView_NavigationCompleted(XXXXX).

In addition, I did some tests on my side and please kindly check(refer to) following codes(snippet):

        private async void webView_NavigationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2NavigationCompletedEventArgs e)  
        {  
            string html = await webView.CoreWebView2.ExecuteScriptAsync("document.documentElement.outerHTML");  
            var htmldecoded = System.Web.Helpers.Json.Decode(html);             
            richTextBox1.Text = htmldecoded;  
        }  

The result:

• Update1:

System.Web.Helpers.XXXX is included in this reference: System.Web.Helpers, please also remember to add System.Web.Helpers reference by right-clicking References > Add Reference… > Assemblies > type system.web.help in the “Search box” and select the System.Web.Helpers reference > OK.

Sincerely,
Tianyu

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Answer 2

Sorry to say I get the following messages for all "Microsoft.AspNet.WebPages" I have tried to install :

This package contains core runtime assemblies shared between ASP.NET MVC and ASP.NET Web Pages.

Severity Code Description Project File Line Suppression State
Error CS0234 The type or namespace name 'Helpers' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) WebView2-NavigationCompleted C:\Users\vmars\source\repos\WebView2-NavigationCompleted\Form1.cs 24 Active
Error CS0234 The type or namespace name 'Helpers' does not exist in the namespace 'System.Web' (are you missing an assembly reference?) WebView2-NavigationCompleted C:\Users\vmars\source\repos\WebView2-NavigationCompleted\Form1.cs 11 Active
Warning The referenced component 'C:\Users\vmars\source\repos\WebView2-NavigationCompleted\packages\Microsoft.Web.WebView2.1.0.674-prerelease\build....\lib\uap10.0\Microsoft.Web.WebView2.Core.winmd' could not be found. WebView2-NavigationCompleted

Is there a specific "Microsoft.AspNet.WebPages" I should try to install , there lots of them .
Thanks

Answer 3

Sorry to say , still getting same error:

Answer 4

Sorry to say , I tried all that you mentioned :

These are the error msgs when trying to compile with 'PF5' ,
Because there is no Start Button .

Severity Code Description Project File Line Suppression State
Error CS0234 The type or namespace name 'Json' does not exist in the namespace 'System.Web.Helpers' (are you missing an assembly reference?) WebView2-NavigationCompleted C:\Users\vmars\source\repos\WebView2-NavigationCompleted\Form1.cs 24 Active

Severity Code Description Project File Line Suppression State
Warning The referenced component 'C:\Users\vmars\source\repos\WebView2-NavigationCompleted\packages\Microsoft.Web.WebView2.1.0.674-prerelease\build....\lib\uap10.0\Microsoft.Web.WebView2.Core.winmd' could not be found. WebView2-NavigationCompleted