Update VoiceChat.razor.cs

Author: IEvangelist

app/SharedWebComponents/Pages/VoiceChat.razor.cs

@@ -80,10 +80,26 @@ private void OnSendPrompt()
                             };
                         }
 
-                        SpeechSynthesis.Speak(utterance);
-
-                        _isReadingResponse = false;
-                        StateHasChanged();
+                        try
+                        {
+                            SpeechSynthesis.Speak(utterance, duration =>
+                            {
+                                _isReadingResponse = false;
+                                StateHasChanged();
+                            });
+                        }
+                        catch
+                        {
+                            // TODO: Find a better way to do this
+                            // The Blazor.SpeechSynthesis.WebAssembly API supports the callback,
+                            // however the underlying code does not do this using a DI-friendly way.
+                            // The code assumes the concrete implementation for the ISpeechSynthesisService
+                            // service is the concrete Web Assembly type which is not valid. However, the
+                            // alternate API is something MAUI can implement.
+                            SpeechSynthesis.Speak(utterance);
+                            _isReadingResponse = false;
+                            StateHasChanged();
+                        }
                     }
                 }