Operation not permitted on IsolatedStorageFileStream 解决方法

在做Windows Phone开发时，应该都遇到过 Operation not permitted on IsolatedSotrageFileStream异常。比如，刚刚Create的File，马上去读就会遇到这样的问题。问题在于IsolatedStorageFile.CreateFile返回的是一个IsolatedStorageFileStream, 而在IsolatedStorageFile.OpenFile时又会创建另一个IsolatedStorageFileStream而前者并没有释放, 因此就会出现这样的问题。正确的用法如下。

using (IsolatedStorageFile isolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication())

                {

                    logPath = Path.Combine(lowerAppName, eventLogFileName);



                    if (!isolatedStorageFile.FileExists(logPath))

                    {

                        using (IsolatedStorageFileStream createFileStream = isolatedStorageFile.CreateFile(logPath))

                        {

                            createFileStream.Close();

                        }



                        using (

                            IsolatedStorageFileStream writeFileStream = isolatedStorageFile.OpenFile(logPath,

                                                                                                     FileMode.OpenOrCreate,

                                                                                                     FileAccess

                                                                                                         .ReadWrite,

                                                                                                     FileShare.ReadWrite)

                            )

                        using (var streamWriter = new StreamWriter(writeFileStream))

                        {



                            streamWriter.WriteLine("Event Log：");



                            streamWriter.Close();

                            writeFileStream.Close();



                            writeFileStream.Dispose();

                        }

                    }

                }