播放器02：顺序播放，用到了InvokeRequired 属性和委托(Delegate)的BeginInvoke方法

初学C#记录历程,记录心情。

UI：

View Code

  1                     using System;

  2                     using System.Collections.Generic;

  3                     using System.ComponentModel;

  4                     using System.Data;

  5                     using System.Drawing;

  6                     using System.Linq;

  7                     using System.Text;

  8                     using System.Windows.Forms;

  9                     using System.Threading;

 10 

 11                     namespace OrderPlay

 12                     {

 13                         public partial class myAudioPlayer : Form

 14                         {

 15 

 16                             private bool close = false;// 关闭窗口标志位

 17                             private bool running = false;//线程结束标志位

 18                             protected List<string> playList = new List<string>();  //定义一个list来保存加进到listbox里面的文件

 19 

 20                              private void SaveFiles()

 21                             {

 22                                 foreach (var fileName in openFileDialog.FileNames)

 23                                 {

 24                                     if (playList.Contains(fileName) == true)          //不加重复的   

 25                                     {

 26                                         continue;

 27                                     }

 28                                     else

 29                                     {

 30                                         playList.Add(fileName);          //保存原始文件到playList

 31                                         lstPlayer.Items.Add(DeletePath(fileName));      //添加文件到listbox

 32                                     }

 33                                 }

 34                             }

 35 

 36 

 37               

 38                             public myAudioPlayer()

 39                             {

 40                                 InitializeComponent();

 41                                 mediaPlayer.uiMode = "Full";

 42                             }

 43                                                 

 44        

 45                             //双击播放列表里面的文件，播放

 46                             private void lstPlayer_MouseDoubleClick(object sender, MouseEventArgs e)

 47                             {

 48                               mediaPlayer.URL = playList[lstPlayer.SelectedIndex];

 49                               

 50                             }

 51 

 52                             private void orderPlayToolStripMenuItem_Click(object sender, EventArgs e)

 53                             {

 54                                 if (!running)

 55                                 {

 56                                     // 启动另一线程检测 mediaPlayer 的播放状态，循环播放列表里的歌曲

 57                                     running = true;

 58                                     Thread thread = new Thread(new ThreadStart(this.CheckStatus));

 59                                     thread.IsBackground = false;   //设置后台线程为false

 60                                     thread.Start();

 61                                 }

 62                                 if (lstPlayer.Items.Count == 0)

 63                                 {

 64                                     MessageBox.Show("No file in List");

 65                                 }

 66                             }

 67 

 68                             //检查线程状态,顺序播放

 69                             private void CheckStatus()

 70                             {

 71                                 while (running && !close)

 72                                 {

 73                                     try

 74                                     {

 75                                         if (mediaPlayer.playState == WMPLib.WMPPlayState.wmppsStopped && lstPlayer.Items.Count > 0)  //是否播放停止且列表有文件

 76                                         {

 77                                             if (lstPlayer.InvokeRequired)           //是否跨线程

 78                                             {

 79                                                 lstPlayer.BeginInvoke(new MethodInvoker(() =>//BeginInvoke方法可以使用线程异步地执行委托所指向的方法

 80                                                 {

 81                                                     SetSelectedIndex();

 82                                                 }), null);

 83                                             }

 84                                             else

 85                                             {

 86                                                 SetSelectedIndex();

 87                                             }

 88 

 89                                         }

 90                                                                          

 91                                     }

 92                                     catch (Exception ex)

 93                                     {

 94                                         MessageBox.Show("出错" + ex.ToString());

 95                                     }

 96                                     System.Threading.Thread.Sleep(1000);//状态检测延时1秒,加快打开歌曲的速度

 97                                 }

 98                                 running = false;

 99                                                             

100 

101                             }

102 

103                             private void SetSelectedIndex()

104                             {

105                                 if (lstPlayer.SelectedIndex + 1 > lstPlayer.Items.Count - 1)  //是否到最下面

106                                 {

107                                     lstPlayer.SelectedIndex = 0;      //回到第一个

108                                 }

109                                 else

110                                 {

111                                     lstPlayer.SelectedIndex = lstPlayer.SelectedIndex + 1;   //下移

112                                 }

113                                 mediaPlayer.URL = playList[lstPlayer.SelectedIndex];   //播放

114             

115                             }

116 

117                             private void threadOrderPlay_FormClosing(object sender, FormClosingEventArgs e)

118                             {

119                                 this.close = true;

120                             }

121 

122                        

123                        

124 

125 

126 

127 

128                         }

129                     }