OpenFile Operation not permitted on IsolatedStorageFileStream

在使用多線程的時候，經常會報錯OpenFile Operation not permitted on IsolatedStorageFileStream，原因是IsolatedStorageFile和IsolatedStorageFileStream在多線程中被多處調用而出現不可預知的記憶體崩潰，此時需要進行加鎖，代碼如下：

 private static readonly object _readLock = new object(); 
using (IsolatedStorageFile myIsolatedStorage = IsolatedStorageFile.GetUserStoreForApplication())            {                //Open existing file                 lock (_readLock)                {                    using (IsolatedStorageFileStream fileStream = new IsolatedStorageFileStream("log.txt", FileMode.Append, myIsolatedStorage))                    using (StreamWriter writer = new StreamWriter(fileStream))                    {                        string someTextData = "\r\n" + DateTime.Now + "-----------" + message;                        writer.Write(someTextData);                    }                }