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How to: Read and Write to Files in Isolated Storage
Visual Studio 2010
There are a number of ways to open a file within a store using the IsolatedStorageFileStream class. Once an IsolatedStorageFileStream has been obtained, it can be used to get a StreamReader or StreamWriter. With the StreamReader and StreamWriter, you can read and write to a file in a store as you would to any other file. For a wider discussion of reading and writing to a file, see File and Stream I/O.
The following code example obtains an isolated store, creates a file named TestStore.txt, and writes "Hello Isolated Storage" to the file. The code then reads the file and prints the results to the console.
using namespace System; using namespace System::IO; using namespace System::IO::IsolatedStorage; public ref class ReadingAndWritingToFiles { public: static int Main() { // Get an isolated store for this assembly and put it into an // IsolatedStoreFile object. IsolatedStorageFile^ isoStore = IsolatedStorageFile::GetStore(IsolatedStorageScope::User | IsolatedStorageScope::Assembly, (Type ^)nullptr, (Type ^)nullptr); // This code checks to see if the file already exists. array<String^>^ fileNames = isoStore->GetFileNames("TestStore.txt"); for each (String^ file in fileNames) { if (file == "TestStore.txt") { Console::WriteLine("The file already exists!"); Console::Write("Type \"StoreAdm /REMOVE\" at the command line to delete all "); Console::WriteLine("Isolated Storage for this user."); // Exit the program. return 0; } } writeToFile(isoStore); Console::WriteLine("The file \"TestStore.txt\" contains:"); // Call the readFromFile and write the returned string to the //console. Console::WriteLine(readFromFile(isoStore)); // Exit the program. return 0; } // End of main. private: // This method writes "Hello Isolated Storage" to the file. static void writeToFile(IsolatedStorageFile^ isoStore) { // Declare a new StreamWriter. StreamWriter^ writer = nullptr; // Assign the writer to the store and the file TestStore. writer = gcnew StreamWriter(gcnew IsolatedStorageFileStream( "TestStore.txt", FileMode::CreateNew, isoStore)); // Have the writer write "Hello Isolated Storage" to the store. writer->WriteLine("Hello Isolated Storage"); writer->Close(); Console::WriteLine("You have written to the file."); } // End of writeToFile. // This method reads the first line in the "TestStore.txt" file. static String^ readFromFile(IsolatedStorageFile^ isoStore) { // This code opens the TestStore.txt file and reads the string. StreamReader^ reader = gcnew StreamReader(gcnew IsolatedStorageFileStream( "TestStore.txt", FileMode::Open, isoStore)); // Read a line from the file and add it to sb. String^ sb = reader->ReadLine(); // Close the reader. reader->Close(); // Return the string. return sb->ToString(); } // End of readFromFile. }; int main() { return ReadingAndWritingToFiles::Main(); }
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