控制 MediaElement（播放、暂停、停止、音量和速度）

控制 MediaElement（播放、暂停、停止、音量和速度）

WPF中对于多媒体的支持非常完整，一般都是通过MediaElement来实现的。

http://msdn.microsoft.com/zh-cn/library/ms748248.aspx

一个关键问题就是：MediaElement 的 LoadedBehavior 属性必须设置为 Manual 才能以交互方式停止、暂停和播放媒体。

下面可以看看代码基本上还是比较简单的

<Window x:Class="WpfApplication2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="544" Width="811">
    <Grid>
        <MediaElement Margin="16,23,12,39" Name="mediaElement1" LoadedBehavior="Manual" Source="ITU.WMV" Volume="{Binding ElementName=slider1, Path=Value}"/>
        <Button Height="23" HorizontalAlignment="Left" Margin="16,0,0,10" Name="button1" VerticalAlignment="Bottom" Width="75" Click="button1_Click">播放</Button>
        <Button Height="23" HorizontalAlignment="Left" Margin="97,0,0,10" Name="button2" VerticalAlignment="Bottom" Width="75" Click="button2_Click">暂停</Button>
        <Button Height="23" HorizontalAlignment="Left" Margin="182,0,0,10" Name="button3" VerticalAlignment="Bottom" Width="75" Click="button3_Click">音量+</Button>
        <Button Height="23" HorizontalAlignment="Left" Margin="263,0,0,10" Name="button4" VerticalAlignment="Bottom" Width="75" Click="button4_Click">音量-</Button>
        <Button Height="23" Margin="347,0,367,10" Name="button5" VerticalAlignment="Bottom" Click="button5_Click">快进</Button>
        <Button Height="23" HorizontalAlignment="Right" Margin="0,0,286,10" Name="button6" VerticalAlignment="Bottom" Width="75" Click="button6_Click">快退</Button>
        <Slider Height="22" HorizontalAlignment="Right" Margin="0,0,12,11" Name="slider1" VerticalAlignment="Bottom" Width="268" />
    </Grid>
</Window>

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.Navigation;
using System.Windows.Shapes;

namespace WpfApplication2
{
    /// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        /// <summary>
        /// 播放
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.Play();
        }
        /// <summary>
        /// 暂停
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.Pause();
        }
        /// <summary>
        /// 增加音量
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, RoutedEventArgs e)
        {
            //mediaElement1.Volume++;
            slider1.Value++;
        }
        /// <summary>
        /// 降低音量
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_Click(object sender, RoutedEventArgs e)
        {
            //mediaElement1.Volume--;
            slider1.Value--;
        }
        /// <summary>
        /// 快进
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button5_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.SpeedRatio++;
        }
        /// <summary>
        /// 快退
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button6_Click(object sender, RoutedEventArgs e)
        {
            mediaElement1.SpeedRatio--;
        }
    }
}