C# 在特定时间启动和停止MediaElement

我正在将一个应用程序改为WPF，它会根据定时事件播放音频、视频和图片。。之前，我使用了“string MciCommand=string.Format”（“播放从{0}到{1}{2}的帧”）

我一直在搜索并试图在WPF c#中解决这个问题

我有一个视频（wmv），我有多个部分需要一起播放。 示例..第1节启动（200ms）停止（250ms）第2节启动（5000ms）停止（15000ms）

最后我需要它停在静止的画面上

我试过使用一个计时器和一个空的while循环，但它没有正确地寻找。 我不知所措，媒体元素似乎不支持这种类型的使用。我想到了wpfmediakit，而direct show很难概括我的wpf新手技能

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任何帮助都将不胜感激……

这就是我最终解决问题的原因。我使用了一个属性列表，并像脚本一样循环使用。如果位置大于结束时间。它将触发计时器并转到列表中的下一项。仍然有一些事情可以改进…就像textbox4 changed事件一样，它也会触发下一个_项，但它完成了任务..目前。。 希望这能帮助有同样问题的人

    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;
    using System.Windows.Media.Animation;
    using System.ComponentModel;
    using System.Threading;
    namespace WpfApplication6
    {
        public partial class MainWindow : Window
        {
            BackgroundWorker position = new BackgroundWorker();
            BackgroundWorker test_position = new BackgroundWorker();
            public List<video_script> script_list = new List<video_script>();
            int scrip_index;
    public class video_script
        {
        public string action { get; set; }
        public TimeSpan start_time { get; set; }
        public TimeSpan endtime { get; set; }
        public string filename { get; set; }

    }
    private void position_DoWork(object sender, DoWorkEventArgs e)
    {
        Thread.Sleep(100);
    }
    private void position_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
      if (mediaElement1.Position > TimeSpan.FromMilliseconds(Convert.ToInt32(tb_endtime.Text)))
        {
            next_item();
        }
        else position.RunWorkerAsync();
        textBox4.Text = "Play";
        textBox3.Text = mediaElement1.Position.ToString();
    }
    public MainWindow()
    {
        InitializeComponent();
        position.DoWork += new DoWorkEventHandler(position_DoWork);
        position.RunWorkerCompleted += new RunWorkerCompletedEventHandler(position_RunWorkerCompleted);
        position.WorkerSupportsCancellation = true;
        test_position.DoWork += new DoWorkEventHandler(test_position_DoWork);
        test_position.RunWorkerCompleted += new RunWorkerCompletedEventHandler(test_position_RunWorkerCompleted);
        test_position.WorkerSupportsCancellation = true;
    }

    private void Mediasource_Click(object sender, RoutedEventArgs e)
    {
        if (!position.IsBusy) position.RunWorkerAsync();
        mediaElement1.Source = new Uri(tb_filename.Text);
        mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
        mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
        mediaElement1.ScrubbingEnabled = true;
        mediaElement1.Play();
    }
    private void stopbutton_Click(object sender, RoutedEventArgs e)
    {
        mediaElement1.Stop();
    }

    private void Playbutton_Click(object sender, RoutedEventArgs e)
    {
        scrip_index = 0;
        mediaElement1.Play();
        mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
        mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
        mediaElement1.ScrubbingEnabled = true;
    }







    private void pausebutton_Click(object sender, RoutedEventArgs e)
    {
        if (mediaElement1.CanPause)
        {
            mediaElement1.Pause();
        }
    }


    private void AddToListbutton_Click(object sender, RoutedEventArgs e)
    {
        video_script temp_item = new video_script();
        temp_item.filename = tb_filename.Text;
        temp_item.start_time = TimeSpan.FromMilliseconds(Convert.ToInt32(tb_starttime.Text));
        temp_item.endtime = TimeSpan.FromMilliseconds(Convert.ToInt32(tb_endtime.Text));
        temp_item.action = tb_action.Text;

        script_list.Add(temp_item);

        listBox1.Items.Add(temp_item.filename + " | " + tb_starttime.Text + " | " + tb_endtime.Text + " | " + tb_action.Text);
    }





    private void positionbox_TextChanged(object sender, TextChangedEventArgs e)
    {
        if (script_list.Count != 0)
        {
            if (script_list[scrip_index].endtime < mediaElement1.Position) next_item();
        }
    }



    #region test button area
    private void next_item()
    {
        if (scrip_index < script_list.Count() - 1)
        {
            scrip_index++; 




            switch (script_list[scrip_index].action)
            {
                case "Load":

              mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
              mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
              if (mediaElement1.Source != new Uri(script_list[scrip_index].filename)) mediaElement1.Source = new Uri(script_list[scrip_index].filename);
              mediaElement1.ScrubbingEnabled = true;
              playing = false;
                    next_item();
                    break;

                case "Play":
                    mediaElement1.Play();
                    playing = true;
                    if(!test_position.IsBusy) test_position.RunWorkerAsync();

                    break;
                case "Pause":
                    mediaElement1.Pause();
                    playing = false;
                    break;
                case "Seek":
                    mediaElement1.Position = script_list[scrip_index].start_time;
                    playing = true;
                    break;
                case "Stop":
                    mediaElement1.Stop();
                    playing = false;
                    break;
            }

        }
    }


    private void test_position_DoWork(object sender, DoWorkEventArgs e)
    {
        Thread.Sleep(100);
    }
    private void test_position_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {



        if (mediaElement1.Position > script_list[scrip_index].endtime )
        {
            next_item();
        }
        else test_position.RunWorkerAsync();

        textBox4.Text = "Play";
        textBox3.Text = mediaElement1.Position.ToString();
        if (playing && !test_position.IsBusy) test_position.RunWorkerAsync();

    }
    private void testbutton_Click(object sender, RoutedEventArgs e)
    {
        if (mediaElement1.Source != new Uri(tb_filename.Text)) mediaElement1.Source = new Uri(tb_filename.Text);
                    mediaElement1.LoadedBehavior = System.Windows.Controls.MediaState.Manual;
        mediaElement1.UnloadedBehavior = System.Windows.Controls.MediaState.Manual;
        mediaElement1.Play();

        mediaElement1.ScrubbingEnabled = true;
        mediaElement1.Position = TimeSpan.FromMilliseconds(Convert.ToInt32(tb_starttime.Text));
        if (test_position.IsBusy) test_position.CancelAsync();

        if (!test_position.IsBusy) test_position.RunWorkerAsync();
    }
    bool playing;
    #endregion
    #region slider region

    private void slider1_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
    {
        if (slider1.Value > slider2.Value) slider2.Value = slider1.Value - 1;
    }
    private void slidermax_values_TextChanged(object sender, TextChangedEventArgs e)
    {
        slider1.Maximum = Convert.ToInt32(tb_slider_maxvalue.Text);
        slider2.Maximum = Convert.ToInt32(tb_slider_maxvalue.Text);
    }
    private void slider2_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
    {
        if (slider2.Value < slider1.Value) slider1.Value = slider2.Value - 1;
    }
    #endregion

    private void start_script_Click(object sender, RoutedEventArgs e)
    {
        scrip_index = -1;
        next_item(); 
    }

    private void mediaElement1_MediaOpened(object sender, RoutedEventArgs e)
    {

    }



   }
}

使用系统；
使用System.Collections.Generic；
使用System.Linq；
使用系统文本；
使用System.Windows；
使用System.Windows.Controls；
使用System.Windows.Data；
使用System.Windows.Documents；
使用System.Windows.Input；
使用System.Windows.Media；
使用System.Windows.Media.Imaging；
使用System.Windows.Navigation；
使用System.Windows.Shapes；
使用System.Windows.Media.Animation；
使用系统组件模型；
使用系统线程；
命名空间WpfApplication6
{
公共部分类主窗口：窗口
{
BackgroundWorker position=新的BackgroundWorker（）；
BackgroundWorker test_position=新的BackgroundWorker（）；
公共列表脚本_List=新列表（）；
国际股票指数；
公共类视频脚本
{
公共字符串操作{get；set；}
公共时间跨度开始时间{get；set；}
公共时间跨度结束时间{get；set；}
公共字符串文件名{get；set；}
}
私有无效位置\u DoWork（对象发送方，DoWorkEventArgs e）
{
睡眠（100）；
}
私有无效位置\u RunWorkerCompleted（对象发送方，RunWorkerCompletedEventArgs e）
{
if（mediaElement1.Position>TimeSpan.fromMillicles（Convert.ToInt32（tb_endtime.Text）））
{
下一项（）；
}
else position.RunWorkerAsync（）；
textBox4.Text=“播放”；
textBox3.Text=mediaElement1.Position.ToString（）；
}
公共主窗口（）
{
初始化组件（）；
position.DoWork+=新的DoWorkEventHandler（position_DoWork）；
position.RunWorkerCompleted+=新的RunWorkerCompletedEventHandler（position\u RunWorkerCompleted）；
position.workers支持扫描单元=真；
test_position.DoWork+=新的doworkenthandler（test_position\u DoWork）；
test_position.RunWorkerCompleted+=新的RunWorkerCompletedEventHandler（test_position_RunWorkerCompleted）；
test_position.workersupport扫描单元=真；
}
私有void Mediasource_单击（对象发送方，路由目标）
{
如果（！position.IsBusy）position.RunWorkerAsync（）；
mediaElement1.Source=新Uri（tb_filename.Text）；
mediaElement1.LoadedBehavior=System.Windows.Controls.MediaState.Manual；
mediaElement1.UnloadedBehavior=System.Windows.Controls.MediaState.Manual；
mediaElement1.ScrubingEnabled=true；
mediaElement1.Play（）；
}
私有无效停止按钮\单击（对象发送者，路由目标）
{
mediaElement1.Stop（）；
}
私有void播放按钮（对象发送者，路由目标e）
{
股票指数=0；
mediaElement1.Play（）；
mediaElement1.LoadedBehavior=System.Windows.Controls.MediaState.Manual；
mediaElement1.UnloadedBehavior=System.Windows.Controls.MediaState.Manual；
mediaElement1.ScrubingEnabled=true；
}
私有无效暂停按钮单击（对象发送器，路由目标）
{
如果（mediaElement1.CanPause）
{
mediaElement1.Pause（）；
}
}
私有void AddToListbutton_单击（对象发送者，路由目标）
{
视频脚本临时项目=新视频脚本（）；
temp_item.filename=tb_filename.Text；
temp_item.start_time=TimeSpan.fromMillics（转换为32（tb_starttime.Text））；
temp_item.endtime=TimeSpan.frommicles（转换为32（tb_endtime.Text））；
temp_item.action=tb_action.Text；
脚本列表。添加（临时项目）；
listBox1.Items.Add（temp_item.filename+“|”+tb_starttime.Text+“|”+tb_endtime.Text+“|”+tb_action.Text）；
}
私有void positionbox_TextChanged（对象发送者，textchangedventargs e）
{
if（script_list.Count！=0）
{
如果（脚本列表[scrip_index].endtime    <Window x:Class="WpfApplication6.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="402" Width="922"   WindowStyle="ThreeDBorderWindow">
    <Grid>
    <Button Content="mediasource load" Height="23" HorizontalAlignment="Left" Margin="10,10,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="Mediasource_Click" />
    <Button Content="play" Height="23" HorizontalAlignment="Left" Margin="10,43,0,0" Name="button2" VerticalAlignment="Top" Width="75" Click="Playbutton_Click" />
    <Button Content="stop" Height="23" HorizontalAlignment="Left" Margin="10,142,0,0" Name="button5" VerticalAlignment="Top" Width="75" Click="stopbutton_Click" />
    <Button Content="Pause" Height="23" HorizontalAlignment="Left" Margin="12,171,0,0" Name="button6" VerticalAlignment="Top" Width="75" Click="pausebutton_Click" />
    <TextBox Height="23" HorizontalAlignment="Left" Margin="165,296,0,0" Name="tb_starttime" VerticalAlignment="Top" Width="120"   Text="{Binding ElementName=slider1, Path=Value, Mode=TwoWay}" />
    <TextBox Height="23" HorizontalAlignment="Right" Margin="0,296,426,0" Name="tb_endtime" VerticalAlignment="Top" Width="120" Text="{Binding ElementName=slider2, Path=Value, Mode=TwoWay}" />
    <TextBox Height="23" HorizontalAlignment="Left" Margin="630,281,0,0" Name="textBox3" VerticalAlignment="Top" Width="120" TextChanged="positionbox_TextChanged" IsReadOnly="False" Text="{Binding ElementName=mediaElement1, Path=Position.Milliseconds, Mode=OneWay, UpdateSourceTrigger=PropertyChanged}" />
    <TextBox Height="23" HorizontalAlignment="Left" Margin="490,281,0,0" Name="textBox4" VerticalAlignment="Top" Width="134" />
    <Label Content="filename" Height="28" HorizontalAlignment="Left" Margin="104,325,0,0" Name="label1" VerticalAlignment="Top" />
    <ListBox Height="215" HorizontalAlignment="Left" Margin="469,10,0,0" Name="listBox1" VerticalAlignment="Top" Width="431" />
    <TextBox Height="23" HorizontalAlignment="Left" Margin="165,325,0,0" Name="tb_filename" VerticalAlignment="Top" Width="213" Text="C:\Data\001femod1\vid\dat1.avi" AcceptsTab="False" />
    <Label Content="end time" Height="28" HorizontalAlignment="Left" Margin="291,294,0,0" Name="label2" VerticalAlignment="Top" />
    <Label Content="start time" Height="28" HorizontalAlignment="Left" Margin="104,296,0,0" Name="label3" VerticalAlignment="Top" />
    <Button Content="add to list" Height="23" HorizontalAlignment="Left" Margin="11,315,0,0" Name="button7" VerticalAlignment="Top" Width="75" Click="AddToListbutton_Click" />
    <Label Content="Action" Height="28" HorizontalAlignment="Left" Margin="384,325,0,0" Name="label4" VerticalAlignment="Top" />
    <ComboBox Height="23" HorizontalAlignment="Left" Margin="434,326,0,0" Name="tb_action" VerticalAlignment="Top" Width="120">
        <ComboBoxItem Content="Play" />
        <ComboBoxItem Content="Load" />
        <ComboBoxItem Content="Stop" />
        <ComboBoxItem Content="Pause" />
        <ComboBoxItem Content="Seek" />
    </ComboBox>
    <Button Content="test times" Height="23" HorizontalAlignment="Left" Margin="50,246,0,0" Name="tb_test" VerticalAlignment="Top" Width="75" Click="testbutton_Click" />
    <Slider Height="23" Margin="147,231,170,0" Name="slider1" VerticalAlignment="Top" SmallChange="1" LargeChange="10" IsSelectionRangeEnabled="False" IsMoveToPointEnabled="True" IsSnapToTickEnabled="True" ValueChanged="slider1_ValueChanged" />
    <Slider Height="23" HorizontalAlignment="Left" Margin="147,260,0,0" Name="slider2" VerticalAlignment="Top" Width="583" SmallChange="1" IsSnapToTickEnabled="True" ValueChanged="slider2_ValueChanged" />
    <Label Content="max value" Height="28" HorizontalAlignment="Left" Margin="736,226,0,0" Name="label5" VerticalAlignment="Top" />
    <TextBox Height="23" HorizontalAlignment="Left" Margin="736,247,0,0" Name="tb_slider_maxvalue" VerticalAlignment="Top" Width="120" Text="74000" TextChanged="slidermax_values_TextChanged" />
    <Button Content="start script" Height="23" HorizontalAlignment="Left" Margin="10,281,0,0" Name="button3" VerticalAlignment="Top" Width="75" Click="start_script_Click" />
    <MediaElement Height="215" HorizontalAlignment="Left" Margin="91,10,0,0" Name="mediaElement1" VerticalAlignment="Top" Width="372" MediaOpened="mediaElement1_MediaOpened" />
    </Grid>
    </Window>

    Player.MediaPlayer.PlaybackSession.PositionChanged += PlaybackSession_PositionChanged;

    private void PlaybackSession_PositionChanged(MediaPlaybackSession sender, object args)
    {
        var playa = sender.MediaPlayer;

        if(playa.Position >= YourSpecialTimeSpan)
        {
            //do something, note can check state with sender.PlaybackState
        }
    }