上面代码报错 CS1503: 参数 2: 无法从"Microsoft.DirectX.DirectSound.WaveFormat”转换为"int'

这个错误是因为在创建SecondaryBuffer对象时，第二个参数需要传入一个整数值，代表缓冲区的大小，但是你传入了WaveFormat对象。

要解决这个错误，你需要计算出缓冲区的大小，并将其传递给SecondaryBuffer构造函数。可以通过以下方式计算缓冲区的大小：

int bufferSize = (int)(memoryStream.Length / ((double)waveFormat.AverageBytesPerSecond / (double)waveFormat.BlockAlign)) * waveFormat.BlockAlign;

然后将计算出的bufferSize作为第二个参数传递给SecondaryBuffer构造函数即可。修改后的Speak方法如下：

static void Speak(string text, Device device)
{
    SpeechSynthesizer speechSynthesizer = new SpeechSynthesizer();
    speechSynthesizer.Volume = 100;
    speechSynthesizer.Rate = 0;

    MemoryStream memoryStream = new MemoryStream();
    speechSynthesizer.SetOutputToWaveStream(memoryStream);
    speechSynthesizer.Speak(text);
    memoryStream.Seek(0, SeekOrigin.Begin);

    WaveFormat waveFormat = new WaveFormat();
    waveFormat.BitsPerSample = 16;
    waveFormat.Channels = 1;
    waveFormat.BlockAlign = (short)(waveFormat.Channels * (waveFormat.BitsPerSample / 8));
    waveFormat.SamplesPerSecond = 16000;
    waveFormat.AverageBytesPerSecond = waveFormat.SamplesPerSecond * waveFormat.BlockAlign;

    int bufferSize = (int)(memoryStream.Length / ((double)waveFormat.AverageBytesPerSecond / (double)waveFormat.BlockAlign)) * waveFormat.BlockAlign;

    SecondaryBuffer buffer = new SecondaryBuffer(bufferSize, device);
    buffer.Write(0, memoryStream, (int)memoryStream.Length, LockFlag.None);
    buffer.Play(0, BufferPlayFlags.Default);
}

这样就可以正确计算缓冲区大小，并将其传递给SecondaryBuffer构造函数。