Windows Phones 7 文件操作

　　　　 private const string foldername = "xu";
        private const string filename = "info.txt";
        private const string filepath = foldername +"/"+ filename;
        private const string settingname = "sname";
        /// <summary>
        /// 创建文件夹
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file=IsolatedStorageFile.GetUserStoreForApplication())
            {
                file.CreateDirectory(foldername);
            }
        }
 　　　　 //检查文件夹是否存在
        private void button2_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file=IsolatedStorageFile.GetUserStoreForApplication())
            {
                if (file.DirectoryExists(foldername))
                {
                    MessageBox.Show("存在"+foldername);
                }
                else
                {
                    MessageBox.Show("不存在");
                }
            }
        }
        //删除文件夹
        private void button3_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
            {
                file.DeleteDirectory(foldername);
            }
        }

        //创建文件
        private void button6_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
            {
              IsolatedStorageFileStream sd= file.CreateFile(filepath);
　　　　　　　　//一定要记得关闭 不然有bug
              sd.Close();
            }
        }
        //判断文件是否存在
        private void button4_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
            {
                if (file.FileExists(filepath))
                {
                    MessageBox.Show("存在"+filepath);
                }
                else
                {
                    MessageBox.Show("不存在");
                }
            }
        }
        //删除文件操作
        private void button5_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
            {
                file.DeleteFile(filepath);
            }
        }

        //在文件里增加内容
        private void button7_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file=IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream fs=file.OpenFile(filepath,FileMode.OpenOrCreate,FileAccess.Write))
                {
                    using (StreamWriter sw = new StreamWriter(fs))
                    {
                        sw.WriteLine("我爱你");
                    } 
                }
            }
        }
        //读取文件内容
        private void button8_Click(object sender, RoutedEventArgs e)
        {
            using (IsolatedStorageFile file = IsolatedStorageFile.GetUserStoreForApplication())
            {
                using (IsolatedStorageFileStream fs = file.OpenFile(filepath, System.IO.FileMode.OpenOrCreate, FileAccess.Read))
                {
                    using (StreamReader sr=new StreamReader(fs))
                    {
                        MessageBox.Show(sr.ReadToEnd());
                    }
                }
            }
        }
        //保存信息配置信息
        private void button9_Click(object sender, RoutedEventArgs e)
        {
            IsolatedStorageSettings.ApplicationSettings[settingname] = "哈哈";
            IsolatedStorageSettings.ApplicationSettings.Save();
            MessageBox.Show("保存成功");
        }
        //读取程序配置信息
        private void button10_Click(object sender, RoutedEventArgs e)
        {
            if (IsolatedStorageSettings.ApplicationSettings.Contains(settingname))
            {
                MessageBox.Show(IsolatedStorageSettings.ApplicationSettings[settingname].ToString());
            }
        }