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<Window x:Class="WpfMediaPlayer.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="MediaPlayer" Height="107" Width="300">
<Grid>
  <Button Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="btFile" VerticalAlignment="Top" Width="100" Click="btFile_Click">音楽ファイル選択</Button>
  <Button Height="23" Margin="114,10,117,0" Name="btPlay" VerticalAlignment="Top" Click="btPlay_Click" Visibility="Visible" IsEnabled="False">再生</Button>
  <Button Height="23" HorizontalAlignment="Right" Margin="0,10,66,0" Name="btStop" VerticalAlignment="Top" Width="47" Click="btStop_Click" IsEnabled="False">停止</Button>
  <Label Background="Aquamarine" Height="24" Margin="10,39,40,0" Name="label3" VerticalAlignment="Top" />
  <MediaElement Height="24" HorizontalAlignment="Right" Margin="0,39,12,0" Name="mediaElement1" VerticalAlignment="Top" Width="28" />
</Grid>
</Window>

using System;
using System.Windows;
using System.Windows.Controls;
using Microsoft.Win32;

  namespace WpfMediaPlayer
  {
    public partial class Window1 : Window
    {
    public Window1()
    {
      InitializeComponent();
    }
    private void btFile_Click(object sender, RoutedEventArgs e)
    {
      OpenFileDialog ofd = new OpenFileDialog();
      ofd.Filter = "MP3|*.mp3";
      if (ofd.ShowDialog() == true)
      {
        string strFile = ofd.FileName;
        label3.Content = strFile;
        mediaElement1.Source = new Uri(strFile, UriKind.Absolute);
        mediaElement1.LoadedBehavior = MediaState.Manual;
        btPlay.IsEnabled = true;
        btStop.IsEnabled = true;
      }
    }

    private void btPlay_Click(object sender, RoutedEventArgs e)
    {
      mediaElement1.Play();
    }

    private void btStop_Click(object sender, RoutedEventArgs e)
    {
      mediaElement1.Stop();
    }
  }
}