Xamarin SimpleAudioPlayer 返回 System.NullReferenceException

Question

I am trying to play a .wav file in Xamarin.

The file is found but I get the below execption using this code. How is that possible as it does find the emailalert.wav file and should get a stream?
System.NullReferenceException: Object reference not set to an instance of an object.

Happens on this line:

 audio.Load(stream);

 public void Play() { String path = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal); String filename2 = "Folder1/emailalert.wav"; String filenameB = Path.Combine(path, filename2); if (File.Exists(filenameB)) { var stream = GetStreamFromFile(filenameB); var audio = Plugin.SimpleAudioPlayer.CrossSimpleAudioPlayer.Current; audio.Load(stream); audio.Play(); } }

Answer 1

I found a solution to embedd the file directly under the Resources folder and then using this code. I also in the Properties of the .wav file choosed "Build Action" and "Embedded Resource".

Now this code plays the file nicely:

 public void Play() { System.Reflection.Assembly assembly = System.Reflection.Assembly.GetExecutingAssembly(); string[] resources = assembly.GetManifestResourceNames(); foreach (string resource in resources) { if (resource.Contains("emailalert.wav")) { Stream stream = assembly.GetManifestResourceStream(resource); if (stream != null) { var audio = Plugin.SimpleAudioPlayer.CrossSimpleAudioPlayer.Current; audio.Load(stream); audio.Play(); break; } } } }