Through the "System.Speech.DLL" Get voice pack problem.

Question

Hello, everyone.
I'm using the WPF programming tool on Win10, my job needs to install the multi-language voice packs for testing the Text-To-Speech on my current OS.
So far, I have installed Japanese, Korean, French, German, Italian, and Portugal 6 language packs. But only the Japanese, Korean, French, German, and Italian can be accessed through "System.Speech.DLL" the GetInstalledVoices().
My question is there any limitation for using the Text-To-Speech with WPF programming application?
What is the reason for this? can anyone help me?
Thank you.

Answer 1

I used UWP api to get Portugal in my WPF project, and below is my steps:

Step1: Right click References>Add Reference... > Browse> C:Program Files (x86)/Windows Kits/10/UnionMetadata/.winmd. Add it to your project as a reference. Note: You will need to change the filter to “All Files”.

Step 2: Refer to Step 1 to add System.Runtime.WindowsRuntime.dll to your project. Path: “C:/Program Files (x86)/Reference Assemblies/MicrosoftFramework/.NETCore/v4.5”

Step 3: Then use below code to get the Install voices:

 private void Button_Click(object sender, RoutedEventArgs e)  
        {  
            using (SpeechSynthesizer synthesizer = new SpeechSynthesizer())  
            {  
                List<VoiceInformation> voiceInfolt =  
                    (  
                        from voice in SpeechSynthesizer.AllVoices  
                        select voice  
                    ).ToList();  
                foreach (VoiceInformation info in voiceInfolt)  
                {  
                    if (info.Language == "pt-PT")  
                    {  
                        txt.Text = info.Language;  
                    }  
                }  
            }  
        }  

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