Xamarin.Forms: how to prevent to open specific Url links from WebView (C# - Xaml)

Introduction:
We know that WebView is a view for displaying web and HTML content in your app. Due to security, sometimes we may need to restrict to open specific urls in our app. 

Description:
In Xamarin.Forms, WebView raises the following events to help you respond to changes in state:

• Navigating – event raised when the WebView begins loading a new page.
• Navigated – event raised when the page is loaded and navigation has stopped.
• ReloadRequested – event raised when a request is made to reload the current content.

So we can use Navigating event, because this event args has a Cancel property that helpful to cancel the new url/page navigation like below

In MainPage.xaml

1. <WebView Navigating="OnNavigating" />  

In MainPage.xaml.cs

async void OnNavigating(object sender, WebNavigatingEventArgs args)  

{  

    // args.url will have new page url  

    if (args.Url == "https://google.com")  

    {  

        args.Cancel = true;  

        await DisplayAlert("Info", "This link was restricted to open in this app.", "Ok");  

    }  

}  

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