原本是DX里的一个例子，我觉得还可以，就COPY出来，想改改看。结果让我大失所望。
最简单要求，就是对音频文件和视频文件可以定位查找，本来它的Video和Audio类都提供了Seek方法，但它们根本不能工作，每次Seek后，都回到0的位置上。后来用Reflector来看它的源代码，结果也是不尽人意，很多底层的代码没有办法反射出来。特别是DX里的一些接口，根本无法查看。最后也只好先暂停了。
本来还想着，要是DX在.Net下封装的比较好的话，我就可以少用C＋＋的COM组件了，直接用C＃来写组件也方便多了。没想到MS的托管DX确实还不够完善，我看可能要等以后的版本了。不过它的MediaPlay的SDK还是不错的，有机会也看看。

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using Microsoft.DirectX;
using Microsoft.DirectX.AudioVideoPlayback;

namespace Webb.DirectX.Debug2
{
    /**//// <summary>
    /// Summary description for Form1.
    /// </summary>
    public class AVPlayer : System.Windows.Forms.Form
    {

        private string filterText = "Video Files (*.avi; *.qt; *.mov; *.mpg; *.mpeg; *.m1v; *.wmv)|*.avi; *.qt; *.mov; *.mpg; *.mpeg; *.m1v; *.wmv|" +
            "Audio files (*.wav; *.mpa; *.mp2; *.mp3; *.au; *.aif; *.aiff; *.snd; *.wma)|*.wav; *.mpa; *.mp2; *.mp3; *.au; *.aif; *.aiff; *.snd; *.wma|" +
            "MIDI Files (*.mid, *.midi, *.rmi)|*.mid; *.midi; *.rmi|" +
            "Image Files (*.jpg, *.bmp, *.gif, *.tga)|*.jpg; *.bmp; *.gif; *.tga|" +
            "All Files (*.*)|*.*";

        private Video ourVideo = null;
        private Audio ourAudio = null;

        Winforms variables#region Winforms variables

        /**//// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;
        private System.Windows.Forms.MainMenu mnuMain;
        private System.Windows.Forms.OpenFileDialog ofdOpen;
        private System.Windows.Forms.MenuItem menuItem3;
        private System.Windows.Forms.MenuItem mnuFile;
        private System.Windows.Forms.MenuItem mnuOpen;
        private System.Windows.Forms.MenuItem menuItem1;
        private System.Windows.Forms.MenuItem mnuPlay;
        private System.Windows.Forms.MenuItem mnuStop;
        private System.Windows.Forms.MenuItem mnuPause;
        private System.Windows.Forms.MenuItem menuItem2;
        private System.Windows.Forms.MenuItem mnuFull;
        private System.Windows.Forms.ToolBar toolBar1;
        private System.Windows.Forms.ToolBarButton toolBarButton1;
        private System.Windows.Forms.ToolBarButton toolBarButton2;
        private System.Windows.Forms.ToolBarButton toolBarButton3;
        private System.Windows.Forms.ToolBarButton toolBarButton4;
        private System.Windows.Forms.ToolBarButton toolBarButton5;
        private System.Windows.Forms.MenuItem mnuExit;
        #endregion

        public AVPlayer()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            OpenFile();
        }

        private bool _IsVideo = false;

        /**//// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            CleanupObjects();
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        Windows Form Designer generated code#region Windows Form Designer generated code
        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.mnuMain = new System.Windows.Forms.MainMenu();
            this.mnuFile = new System.Windows.Forms.MenuItem();
            this