AxWMPLib.AxWindowsMediaPlayer出现异常是什么原因（急）

Question

　AxWMPLib.AxWindowsMediaPlayer()出现异常是什么原因
代码如下：   
　　　　wavfile="d:\\mms\\111.wav";
       double playtime;
 　　　axWindowsMediaPlayer1 = new AxWMPLib.AxWindowsMediaPlayer();
　　 　axWindowsMediaPlayer1.URL = wavfile;　 
　　　　playtime = Math.Floor(axwmp.currentMedia.duration); axWindowsMediaPlayer1.URL = wavfile;　 //就是这句话有问题．
问题提示为：System.Windows.Forms.AxHost+InvalidActiveXStateException: 发生异常．
各位大虾，帮忙看看啊．

Answer 1

http://www.cnblogs.com/Advance/archive/2005/03/15/119054.html

Answer 2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;using AxWMPLib;
using System.IO;
using System.Xml.Linq;namespace PlayMusic
{
    public partial class Form1 : Form
    {
        private FileInfo[] fileList;
        private  string fp = Environment.CurrentDirectory + @"\FolderPath.xml";
        private string _folderPath = String.Empty;
        private AxWindowsMediaPlayer player=new AxWindowsMediaPlayer();
        public Form1()
        {
            InitializeComponent();
            //player.BeginInit();
            if (File.Exists(fp)) {
                var pathXml = XElement.Load(fp);
                _folderPath = pathXml.Value;
                Fill();
                //激活控件
                this.Controls.Add(player);
                player.EndInit();
               
                
                            }
        }
        //获取文件夹路径并保存
        private void broButton_Click(object sender, EventArgs e)
        {
            var fbd = new FolderBrowserDialog();
            fbd.ShowNewFolderButton  =false;
            if (fbd.ShowDialog() == DialogResult.OK) {
                checkedListBox1.Items.Clear();
                if (!File.Exists(fp))
                {
                    var pathXml = new XElement("MusicFolderPath", fbd.SelectedPath);
                    pathXml.Save(fp);
                }
                else {
                    var pathXml = XElement.Load(fp);
                    pathXml.SetValue(fbd.SelectedPath);
                    pathXml.Save(fp);
                }
                _folderPath = fbd.SelectedPath;
                Fill();
            }
                        }
        //返回文件列表
        private List<string> GetAllFile(string folderPath) {
            var lis = new List<string>();
            var dir = new DirectoryInfo(folderPath);
            fileList = dir.GetFiles();
            foreach (FileInfo f in fileList)
            {
                if (Path.GetExtension(f.Name).ToLower() == ".mp3" || Path.GetExtension(f.Name).ToLower() == ".wmv") 
                {
                    lis.Add(f.Name);
                }
            }
            return lis;        }
        //填充选择列表框
        private void Fill() {
            if (_folderPath == String.Empty)
                return;
            if (GetAllFile(_folderPath).Count ==0 )
                return;
            foreach (var i in GetAllFile(_folderPath)) 
            {
                checkedListBox1.Items.Add(Path.GetFileNameWithoutExtension(i));
            }
            checkedListBox1.SelectedIndex = 0;
        }
       
        private void playButton_Click(object sender, EventArgs e)
        {
            PlayMusic(fileList[checkedListBox1.SelectedIndex+2].FullName);
        }
        //播放
        private void PlayMusic(string filePath) {
           
            try
            {
                player.URL = filePath;
                player.Ctlcontrols.play();            }
            catch(Exception exp) {
                MessageBox.Show(exp.Message);
            }
        }     
  
        
    }
}

Answer 3

我也 遇到同类的问题  后来 加上 这个 就好了
  //激活控件 
                this.Controls.Add(player); 
                player.EndInit();