Windows Phones 文件操作，自己重新测试了一遍，通过，给大家参考使用。

　　　　 private const string foldername = "xu";        private const string filename = "info.txt";        private const string filepath = foldername +"/"+ filename;        private const string settingname = "sname";        /// 
        /// 创建文件夹        /// 
        ///         ///         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());            }        }