C# 直接调用 OpenFileDialog ，接着用 wmplayer 播放音乐文件。

编写  open_wmp.cs  如下

// open a music file
using System;
using System.Diagnostics;
using System.Windows.Forms;
 
public class OpenMusicFile
{
    [STAThread]
    public static void Main()
    {
        OpenFileDialog ofd = new OpenFileDialog();
 
        // 设置对话框属性
        ofd.Title = "请选择音乐文件";
        // 设置初始目录
        ofd.InitialDirectory = "D:\\Music";
        // 设置文件过滤器
        ofd.Filter = "mp3 files (*.mp3)|*.mp3|all files (*.*)|*.*";
        ofd.FilterIndex = 1; // 设置默认的文件过滤器索引
        ofd.RestoreDirectory = true; // 设置在关闭对话框前还原目录
 
        if (ofd.ShowDialog() == DialogResult.OK) // 显示对话框
        {
            // 获取选中的文件路径
            string filePath = ofd.FileName;
            Console.WriteLine("play: " +filePath);
            ProcessStartInfo startInfo = new ProcessStartInfo(@"C:\Program Files\Windows Media Player\wmplayer.exe");
            startInfo.Arguments = "\"" +filePath +"\"";
            startInfo.UseShellExecute = true;
            Process process = Process.Start(startInfo);
            process.WaitForExit();
        } else {
            Console.WriteLine("Select null");
        }
    }
}

编译  csc /r:System.Windows.Forms.dll /target:winexe open_wmp.cs

或者 csc open_wmp.cs  也是可以的

运行  open_wmp