使用 IsolatedStorageFileStream 存储信息

 static void Main(string[] args)
        {
            string fileName = "test.txt";
            SaveData("测试内容.", fileName);
            string content = LoadData(fileName);
            Console.ReadKey();
        }
        //保存
        static void SaveData(string _data, string _fileName)
        {
            //如果尝试使用此方法 ClickOnce 或基于 Silverlight 的应用程序之外，你将收到IsolatedStorageException异常，因为不能确定调用方的应用程序标识。
            //using (IsolatedStorageFile myIsf = IsolatedStorageFile.GetUserStoreForApplication())

            using (IsolatedStorageFile isf = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null))
            {
                //var availableFreeSpace = isf.AvailableFreeSpace.ToString() + " bytes";//这里是剩余空间
                //var quota = isf.Quota.ToString() + " bytes";//这里是当前的限额
                //var usedSpace = (isf.Quota - isf.AvailableFreeSpace).ToString() + " bytes";//这里是用户已经使用的空间

                //if (true == isf.IncreaseQuotaTo(1048576 * 2))//将限额增加到2MB(注: 这里单位是bytes) 新配额必须大于旧配额
                //{
                //    quota = isf.Quota.ToString() + " bytes";//  限额
                //}
                //else
                //{
                //   var Text = "限额更改失败.";
                //}

                using (IsolatedStorageFileStream isolatedStorageFileStream = new IsolatedStorageFileStream(_fileName, FileMode.OpenOrCreate, isf))
                {
                    //获取文件路径
                    //string filePath = isolatedStorageFileStream.GetType().GetField("m_FullPath", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(isolatedStorageFileStream).ToString();
                    using (StreamWriter mySw = new StreamWriter(isolatedStorageFileStream))
                    {
                        mySw.BaseStream.Seek(0, SeekOrigin.End); //追加(写入位置)
                        mySw.Write(_data);
                        mySw.Close();
                    }
                }
            }
        }
        //读取
        static string LoadData(string _fileName)
        {
            string data = String.Empty;
            using (IsolatedStorageFile myIsf = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null))
            {
                using (IsolatedStorageFileStream isolatedStorageFileStream = new IsolatedStorageFileStream(_fileName, FileMode.Open, myIsf))
                {    //获取文件路径
                     //  string filePath = isolatedStorageFileStream.GetType().GetField("m_FullPath", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(isolatedStorageFileStream).ToString();
                    using (StreamReader sr = new StreamReader(isolatedStorageFileStream))
                    {
                        string lineOfData = string.Empty;
                        while ((lineOfData = sr.ReadLine()) != null)
                            data += lineOfData;
                    }
                }
            }
            return data;
        }

    }