简单的NAudio播放

答案到目前为止过于复杂，问题只是如何播放.wav文件。

我所知道的播放。wav文件的最简单的NAudio方法是，

 public void PlaySound(string fileName)
    {
        var input = new NAudio.Wave.AudioFileReader(fileName);
        var w = new NAudio.Wave.WaveOut();
        w.Init(input);
        w.Play();
    }

如下:

    using System; 
    using System.Windows.Forms;
    namespace playDataAudio { 
        public partial class Form1 : Form { 
              public Form1() { InitializeComponent(); 
        }
        using System;
        using System.Windows.Forms;
        namespace playDataAudio
        {
            public partial class Form1 : Form
            {
                public Form1()
                {
                    InitializeComponent();
                }
                private NAudio.Wave.BlockAlignReductionStream stream = null;
                private NAudio.Wave.DirectSoundOut output = null;
                private void openFileButton_Click(object sender, EventArgs e)
                {
                    OpenFileDialog open = new OpenFileDialog();
                    open.Filter = "Audio File (*.mp3;*.wav)|*.mp3;*.wav;";
                    if (open.ShowDialog() != DialogResult.OK) return;
                    DisposeWave();
                    if (open.FileName.EndsWith(".mp3"))
                    {
                        NAudio.Wave.WaveStream pcm = NAudio.Wave.WaveFormatConversionStream.CreatePcmStream(new NAudio.Wave.Mp3FileReader(open.FileName));
                        stream = new NAudio.Wave.BlockAlignReductionStream(pcm);
                    }
                    else if (open.FileName.EndsWith(".wav"))
                    {
                        NAudio.Wave.WaveStream pcm = new NAudio.Wave.WaveChannel32(new NAudio.Wave.WaveFileReader(open.FileName));
                        stream = new NAudio.Wave.BlockAlignReductionStream(pcm);
                    }
                    else throw new InvalidOperationException("Not a correct audio file type.");
                    output = new NAudio.Wave.DirectSoundOut();
                    output.Init(stream);
                    output.Play();
                    pauseButton.Enabled = true;
                }
                private void pauseButton_Click(object sender, EventArgs e)
                {
                    if (output != null)
                    {
                        if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Pause();
                        else if (output.PlaybackState == NAudio.Wave.PlaybackState.Paused) output.Play();
                    }
                }
                private void DisposeWave()
                {
                    if (output != null)
                    {
                        if (output.PlaybackState == NAudio.Wave.PlaybackState.Playing) output.Stop();
                        output.Dispose();
                        output = null;
                    }
                    if (stream != null)
                    {
                        stream.Dispose();
                        stream = null;
                    }
                }
                private void Form1_FormClosing(object sender, FormClosingEventArgs e)
                {
                    DisposeWave();
                }
            }
        }
    }