Question

I’m developing metro app using Windows 8 release preview and C#(VS 2012), I’m stuck with creating file Asynchronously. I’m using following code to create file in folder

StorageFolder storageFolder = await Windows.ApplicationModel.Package.Current.InstalledLocation.GetFolderAsync("Data");            
StorageFile File= await storageFolder.CreateFileAsync("DataFile",CreationCollisionOption.ReplaceExisting); 
await Windows.Storage.FileIO.WriteTextAsync(File, result);

Where “Data” is foldername,”result” is text and “DataFile” is filename, But I got UnAuthorisedAccessException at this line

 StorageFile File= await storageFolder.CreateFileAsync("DataFile",CreationCollisionOption.ReplaceExisting); 

I understand that my folder “Data” is read only, but how do I change the folder attribute to writable, I also tried storageFolder.Attributes property but it is readonly property.

Answer 1

You do not get write access in the InstalledLocation. It would basically be like writing to “Program Files” (it actually is a folder inside of “Program Files”), which as far as I remember was blocked as far back as Vista for security reasons.

You should try writing to ApplicationData.Current.LocalFolder instead.