如图所示，效果如下：

步骤如下：

新建一个winform窗体，双击界面，进入代码区：

复制（下面代码中命名空间内的代码）到（你的命名空间下），运行。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;namespace WindowsFormsApp6
{public partial class Form1 : Form{private TextBox textBox1;private Button button1;public Form1(){InitializeComponent();this.button1 = new System.Windows.Forms.Button();this.textBox1 = new System.Windows.Forms.TextBox();this.SuspendLayout();// // button1// this.button1.Location = new System.Drawing.Point(192, 40);this.button1.Name = "button1";this.button1.Size = new System.Drawing.Size(88, 24);this.button1.TabIndex = 0;this.button1.Text = "Browse";this.button1.Click += new System.EventHandler(this.button1_Click);// // textBox1// this.textBox1.Location = new System.Drawing.Point(8, 40);this.textBox1.Name = "textBox1";this.textBox1.Size = new System.Drawing.Size(168, 20);this.textBox1.TabIndex = 1;this.textBox1.Text = "FIle path";// // Form1// this.AutoScaleDimensions = new System.Drawing.SizeF(5, 13);this.ClientSize = new System.Drawing.Size(292, 266);this.Controls.Add(this.textBox1);this.Controls.Add(this.button1);this.Name = "Form1";this.Text = "Platform Invoke WinSound C#";this.ResumeLayout(false);this.PerformLayout();}[System.Runtime.InteropServices.DllImport("winmm.DLL", EntryPoint = "PlaySound", SetLastError = true, CharSet = CharSet.Unicode, ThrowOnUnmappableChar = true)]private static extern bool PlaySound(string szSound, System.IntPtr hMod, PlaySoundFlags flags);[System.Flags]public enum PlaySoundFlags : int{SND_SYNC = 0x0000,SND_ASYNC = 0x0001,SND_NODEFAULT = 0x0002,SND_LOOP = 0x0008,SND_NOSTOP = 0x0010,SND_NOWAIT = 0x00002000,SND_FILENAME = 0x00020000,SND_RESOURCE = 0x00040004}private void Form1_Load(object sender, EventArgs e){}private void button1_Click(object sender, EventArgs e){OpenFileDialog dialog1 = new OpenFileDialog();dialog1.Title = "Browse to find sound file to play";dialog1.InitialDirectory = @"c:\";dialog1.Filter = "Wav Files (*.wav)|*.wav";dialog1.FilterIndex = 2;dialog1.RestoreDirectory = true;if (dialog1.ShowDialog() == DialogResult.OK){textBox1.Text = dialog1.FileName;PlaySound(dialog1.FileName, new System.IntPtr(), PlaySoundFlags.SND_SYNC);}}}
}