在C#里，如何用API播放MIDI乐音，这里的代码看不动，谁来个详细的例子。

在C#里，如何用API播放MIDI乐音，这里的代码看不动，谁来个详细的例子。
using   System;   
  using   System.Text;   
  using   System.Runtime.InteropServices;   
    
  namespace   Music   
  {   
          /**////   <summary>   
          ///     
          ///   </summary>   
          public   class   Audio   
          {   
                  [DllImport("winmm.dll")]   
                  private   static   extern   int   mciSendString     
                          (   
                                  string   lpstrCommand,   
                                  string   lpstrReturnString,   
                                  int   uReturnLength,   
                                  int   hwndCallback   
                          );   
    
                  [DllImport("kernel32.dll",   CharSet   =   CharSet.Auto)]   
                  public   static   extern   int   GetShortPathName   
                          (   
                                  [MarshalAs(UnmanagedType.LPTStr)]         string   path,   
  　                                 [MarshalAs(UnmanagedType.LPTStr)]         StringBuilder   shortPath,   
  　                                 int   shortPathLength   
                          );     
    
                  public   Audio()   
                  {           
    
                  }   
    
                  public   void   Play(string   FileName)   
                  {   
                          StringBuilder   shortPathTemp   =   new   StringBuilder(255);   
                          int   result   =   GetShortPathName(FileName,   shortPathTemp,   shortPathTemp.Capacity);   
                          string   ShortPath   =   shortPathTemp.ToString();   
    
                          mciSendString("open   "+ShortPath+"   alias   song","",0,0);   
                          mciSendString("play   song","",0,0);   
                  }   
    
                  public   void   Stop()   
                  {   
                          mciSendString("stop   song","",0,0);   
                  }   
    
                  public   void   Pause()   
                  {   
                          mciSendString("pause   song","",0,0);   
                  }   
    
                  public   void   Close()   
                  {   
                          mciSendString("close   song","",0,0);   
                  }   
          }   
  }
在C#里，如何用API播放MIDI乐音，这里的代码看不动，谁来个详细的例子。