SpeechSynthesizer.SelectVoice切换pt-BR语音时异常求助

我最近碰到了一个棘手的小问题：用SpeechSynthesizer调用英语语音（en-US, Helen）时一切正常，但切换到巴西葡萄牙语的Maria语音时，程序直接抛出了“语音未安装或已禁用”的异常。

为了确认语音是否真的安装，我先运行了这段代码检查已安装的语音列表：

Console.WriteLine("Installed voices -");
foreach (InstalledVoice voice in synth.GetInstalledVoices())
{
    VoiceInfo info = voice.VoiceInfo;
    Console.WriteLine(" Voice Name: " + info.Name + info.Culture + info.Description);
}

输出结果明确显示Maria语音已经安装：

Voice Name: Microsoft David Desktopen-USMicrosoft David Desktop - English (United States)
Voice Name: Microsoft Zira Desktopen-USMicrosoft Zira Desktop - English (United States)
Voice Name: Microsoft Maria Desktoppt-BRMicrosoft Maria Desktop - Portuguese(Brazil)

而我原本设置语音的代码是这样的：

using (var synth = new SpeechSynthesizer())
{
    synth.SelectVoice("Microsoft Server Speech Text to Speech Voice (pt-BR, Maria)");
    synth.Volume = 100; // (0 - 100)
    synth.Rate = 0; // (-10 - 10)
    synth.Speak("Central esta Off-Line");
}

问题根源与解决方案 #

问题其实出在传入SelectVoice的语音名称不匹配！从已安装语音的输出可以看到，Maria的实际名称是Microsoft Maria Desktop，而不是我之前误用的服务器版语音名称。

修改后的正确代码如下：

using (var synth = new SpeechSynthesizer())
{
    // 使用实际安装的语音名称
    synth.SelectVoice("Microsoft Maria Desktop");
    synth.Volume = 100;
    synth.Rate = 0;
    synth.Speak("Central esta Off-Line");
}

如果想要更灵活、避免硬编码名称出错的话，还可以通过文化信息（Culture）来筛选语音：

using (var synth = new SpeechSynthesizer())
{
    var brazilianCulture = new System.Globalization.CultureInfo("pt-BR");
    var mariaVoice = synth.GetInstalledVoices(brazilianCulture)
                          .FirstOrDefault(v => v.VoiceInfo.Name.Contains("Maria"));
    
    if (mariaVoice != null)
    {
        synth.SelectVoice(mariaVoice.VoiceInfo.Name);
        synth.Volume = 100;
        synth.Rate = 0;
        synth.Speak("Central esta Off-Line");
    }
    else
    {
        Console.WriteLine("Maria voice not found!");
    }
}

我已经确认所有语音包组件都正确安装，修改后程序就能正常运行了，希望这个方案能帮到遇到同样问题的朋友。

内容的提问来源于stack exchange，提问作者Breno Almeida