First:
The answer to your question:
You must ensure the Webview2 control is initialized before you can use it. You can do this in one of two ways, either call:
await MyWebView.EnsureCoreWebView2Async();
Or simply set the Source property.
Next:
This is just a good advice. I never use 'NavigateToString', because having html in a C# string can quickly become 'messy'.
Instead I create a subfolder (called 'html'). Then I have a html file, a css file and a script file inside this folder. Now I can edit the files directly and have intellisense and error checking at design time.
Remember: Click the files in 'Property Inspector', then in properties window, select 'Copy to output directory'. Here select: 'Copy if newer'. Now the files will be copied to 'Bin' folder, so WebView2 can find them.
Now in your code, you simple set the WebView2's Source property to the path of the html file, like this:
MyWebView.Source = new Uri(Path.Combine(Environment.CurrentDirectory, @"HtmlMyWebView.html"));
Note: This will automatically initialize the WebView2 and navigate to your html file.
In your html file, you can now include css and script files like you normally do for a webpage:
<html>
<head>
<meta charset="utf-8" />
<title>Whatever</title>
<link rel="stylesheet" href="MyWebView.css" type="text/css" />
<script type="text/javascript" src="MyWebView.js">
</script>
................
This is IMHO a much nicer way to use local html - much easier to maintain.
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