用WPF控件MediaElement创建简易播放器(视频区域、播放控制区域、播放列表、循环播放)

软件概览：

区域组成：一个MediaElement控件+一个ListView控件+一个TextBlock控件+一个Slider控件+若干button控件

功能介绍：

1、视频区

       用于播放列表中的视频内容

2、控制区

      包含播放(暂停)、停止、快进、快退、音量；返回按钮为关闭此窗体

3、播放列表

      显示所要播放的视频列表，列表中的内容位于一个盘符目录中，向此目录添加视频时，启动此程序，列表将显示此目录下的所有视频，程序已设为播放列表循环播放(非单个循环)。

代码如下：

Xaml：

<Window x:Class="泗阳行政服务中心.VentureNewsWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="VentureNewsWindow" Height="1138" Width="2000" WindowStartupLocation="CenterScreen" WindowState="Maximized" WindowStyle="None" Loaded="Window_Loaded" ShowInTaskbar="False" Background="#FF2C2C31">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="418*" />
            <ColumnDefinition Width="72*" />
            <ColumnDefinition Width="83*" />
            <ColumnDefinition Width="72*" />
            <ColumnDefinition Width="80*" />
            <ColumnDefinition Width="72*" />
            <ColumnDefinition Width="68*" />
            <ColumnDefinition Width="73*" />
            <ColumnDefinition Width="85*" />
            <ColumnDefinition Width="60*" />
            <ColumnDefinition Width="604*" />
            <ColumnDefinition Width="18*" />
            <ColumnDefinition Width="163*" />
            <ColumnDefinition Width="110*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="15*" />
            <RowDefinition Height="44*" />
            <RowDefinition Height="990*" />
            <RowDefinition Height="7*" />
            <RowDefinition Height="37*" />
            <RowDefinition Height="4*" />
            <RowDefinition Height="2*" />
        </Grid.RowDefinitions>
        <!--  Background="#FF2C2C31" Foreground="#FF9AE500" -->
        <ListView Margin="1,0,0,0" Name="listView1" SelectionMode="Single" IsSynchronizedWithCurrentItem="{x:Null}" SelectionChanged="listView1_SelectionChanged" Grid.Row="2" Grid.ColumnSpan="3" Grid.Column="11" Background="#FF2C2C31" Foreground="#FF9AE500" FontSize="20" />
        <Button Content="返 回" Grid.Column="11" Grid.Row="3" Margin="1,0,0,1" Name="button1" FontSize="32" Foreground="#FF9AE500" Background="{x:Null}" Grid.ColumnSpan="3" Click="button1_Click" Cursor="Hand" Grid.RowSpan="2" />
        <MediaElement Volume="{Binding ElementName=volumeSlider, Path=Value}" Grid.RowSpan="3" Name="mediaElement1" Margin="0,0,5,0" MediaEnded="mediaElement1_MediaEnded" Grid.ColumnSpan="11" />
        <Slider x:Name="volumeSlider" Minimum="0" Maximum="1" Value="0.5" Margin="1,11,430,12" Grid.Row="4" Grid.Column="10" />
        <TextBlock Grid.Row="4" Margin="4,7,4,5" Name="textBlock1" Text="音量:" Foreground="#FF9AE500" FontSize="20" Grid.Column="9" />
        <Button Background="{x:Null}" Content="播 放" Cursor="Hand" FontSize="20" Foreground="#FF9AE500" Margin="2,1,0,1" Name="button3" Grid.Row="4" Click="button3_Click_1" Grid.Column="1" />
        <Button Background="{x:Null}" Content="停 止" Cursor="Hand" FontSize="20" Foreground="#FF9AE500" Margin="2,1,0,1" Name="button4" Grid.Row="4" Click="button4_Click" Grid.Column="3" />
        <Button Background="{x:Null}" Content="快 进" Cursor="Hand" FontSize="20" Foreground="#FF9AE500" Margin="2,1,0,0" Name="button5" Grid.Row="4" Click="button5_Click" Grid.Column="5" />
        <Button Background="{x:Null}" Content="快 退" Cursor="Hand" FontSize="20" Foreground="#FF9AE500" Margin="1,1,2,1" Name="button6" Grid.Row="4" Click="button6_Click" Grid.Column="7" />
        <Button Background="{x:Null}" Content="播放列表" Cursor="Hand" FontSize="32" Foreground="#FF9AE500" Margin="0,1,1,0" Name="button2" Grid.Column="11" Grid.ColumnSpan="3" Grid.Row="1" />
    </Grid>
</Window>

cs：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.IO;

namespace 泗阳行政服务中心
{
    /// <summary>
    /// VentureNewsWindow.xaml 的交互逻辑
    /// </summary>
    public partial class VentureNewsWindow : Window
    {
        string root = "", pathMedia = "";

        public VentureNewsWindow()
        {
            InitializeComponent();

            InitPath();
            AddItemToListView();
        }

        //获取视频目录
        private void InitPath()
        {
            ApplicationPath ap = new ApplicationPath();
            root = ap.GetRtfPath("root");
            pathMedia = root + ap.GetRtfPath("pathMedia");
        }

        //将视频目录下的视频名称添加到ListView中
        private void AddItemToListView()
        {
            string[] files = Directory.GetFiles(pathMedia);
            foreach (string file in files)
            {
                this.listView1.Items.Add(file.Substring(file.LastIndexOf('\\') + 1));
            }
        }

        //窗体加载时调用视频，进行播放
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            MediaElementControl();
        }

        //存储播放列表中视频的名称
        List<string> fileNames = new List<string>();
        private void MediaElementControl()
        {
            this.mediaElement1.LoadedBehavior = MediaState.Manual;
            
            string[] files = Directory.GetFiles(pathMedia);
            
            foreach(string file in files)
            {
                fileNames.Add(file.Substring(file.LastIndexOf('\\') + 1));
            }

            this.mediaElement1.Source = new Uri(files[0]);

            this.mediaElement1.Play();
        }

        //视频播放结束事件
        private void mediaElement1_MediaEnded(object sender, RoutedEventArgs e)
        {
            //获取当前播放视频的名称（格式为：xxx.wmv）
            string path = this.mediaElement1.Source.LocalPath;
            string currentfileName = path.Substring(path.LastIndexOf('\\') + 1);

            //对比名称列表，如果相同，则播放下一个，如果播放的是最后一个，则从第一个重新开始播放
            for (int i = 0; i < fileNames.Count;i++ )
            {
                if (currentfileName == fileNames[i])
                {
                    if (i == fileNames.Count - 1)
                    {
                        this.mediaElement1.Source = new Uri(pathMedia + "//" + fileNames[0]);
                        this.mediaElement1.Play();
                    }
                    else
                    {
                        this.mediaElement1.Source = new Uri(pathMedia + "//" + fileNames[i + 1]);
                        this.mediaElement1.Play();
                    }
                    break;
                }
            }
        }

        //播放列表选择时播放对应视频
        private void listView1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            string fileName = this.listView1.SelectedValue.ToString();
            this.mediaElement1.Source = new Uri(pathMedia + "//" + fileName);
            this.mediaElement1.Play();
        }

        //返回按钮
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            this.mediaElement1.Position = this.mediaElement1.Position + TimeSpan.FromSeconds(20);
        }
        
        //播放、暂停按钮
        private void button3_Click_1(object sender, RoutedEventArgs e)
        {
            if (button3.Content.ToString() == "播 放")
            {
                mediaElement1.Play();
                button3.Content = "暂 停";
                mediaElement1.ToolTip = "Click to Pause";
            }
            else
            {
                mediaElement1.Pause();
                button3.Content = "播 放";
                mediaElement1.ToolTip = "Click to Play";
            }
        }

        //停止播放视频
        private void button4_Click(object sender, RoutedEventArgs e)
        {
            this.mediaElement1.Stop();
        }

        //快进
        private void button5_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.Position = mediaElement1.Position + TimeSpan.FromSeconds(10);
        }

        //快退
        private void button6_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.Position = mediaElement1.Position - TimeSpan.FromSeconds(10);
        }


    }
}

上面的cs代码中所用的ApplicationPath类代码如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;

namespace 泗阳行政服务中心
{
    class ApplicationPath
    {
        private readonly static string ImagePath = Environment.CurrentDirectory + "\\image\\";
        private readonly static string RtfPath = Environment.CurrentDirectory + "\\rtf\\";

        XmlDocument xDoc = new XmlDocument();
        public ApplicationPath()
        {
            xDoc.Load(getAppConfigPath());
        }

        public static string getImagePath()
        {
            return ImagePath;
        }

        public static string getRtfPath()
        {
            return RtfPath;
        }

        public string getAppConfigPath()
        {
            return Environment.CurrentDirectory + "\\App.config";
        }

        //获取App.config值
        public string GetRtfPath(string appKey)
        {
            try
            {
                XmlNode xNode;
                XmlElement xElem;
                xNode = xDoc.SelectSingleNode("//appSettings");
                xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");
                if (xElem != null)
                {
                    return xElem.GetAttribute("value");
                }
                else
                    return "";
            }
            catch (Exception)
            {
                return "";
            }
        }
    }
}

上面代码中的App.config文件位于项目的/bin/Debug下，内容格式为：

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <appSettings>
  	<add key="root" value="D:\泗阳行政服务中心文档\" />
		<add key="pathMedia" value="平时状态\创业新闻\" />
   </appSettings>
</configuration>