HybridWebView ArgumentNullException when using HtmlWebViewSource instead of file

[hansmbakker]

WebView supports setting its Source property to a HtmlWebViewSource object.

Expected behavior:
Since HybridWebView derives from WebView, it is expected that HybridWebView also supports this.

Actual behavior:
However, when doing that (and not specifying a html source file, the app crashes.

Stacktrace:

[mono-rt] [ERROR] FATAL UNHANDLED EXCEPTION: System.ArgumentNullException: Value cannot be null. (Parameter 'path1')
[mono-rt]    at System.ArgumentNullException.Throw(String paramName)
[mono-rt]    at System.ArgumentNullException.ThrowIfNull(Object argument, String paramName)
[mono-rt]    at System.IO.Path.Combine(String path1, String path2)
[mono-rt]    at HybridWebView.AndroidHybridWebViewClient.ShouldInterceptRequest(WebView view, IWebResourceRequest request)
[mono-rt]    at Android.Webkit.WebViewClient.n_ShouldInterceptRequest_Landroid_webkit_WebView_Landroid_webkit_WebResourceRequest_(IntPtr jnienv, IntPtr native__this, IntPtr native_view, IntPtr native_request) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/obj/Release/net8.0/android-34/mcw/Android.Webkit.WebViewClient.cs:line 801
[mono-rt]    at Android.Runtime.JNINativeWrapper.Wrap_JniMarshal_PPLL_L(_JniMarshal_PPLL_L callback, IntPtr jnienv, IntPtr klazz, IntPtr p0, IntPtr p1) in /Users/runner/work/1/s/xamarin-android/src/Mono.Android/Android.Runtime/JNINativeWrapper.g.cs:line 231

[Eilon]

Hi, the official HybridWebView (work in progress PR here) won't support WebViewSources at all because it serves up only static files that are "Raw MAUI Assets". This worked in the prototype in this repo only because for simplicity the HybridWebView control derived from the regular WebView, so it inherited various APIs that it didn't really support at all.

As such, I am closing this issue because it wasn't really meant to work to begin with.

[hansmbakker]

Is it possible to turn this into a feature request? What's the downside of supporting a string-based source?

[Eilon]

Is it possible to turn this into a feature request? What's the downside of supporting a string-based source?

Yeah go ahead and log an issue in the MAUI repo describing the scenario and what code you'd like to be able to write. I definitely like the idea of 'not having files on disk' for some of the content, but I have some various ideas on how to implement it.

[hansmbakker]

Done, created dotnet/maui#23908