Create file in Xamarin Cross Platform App Development - xamarin.forms

Question

I'm new to Xamarin. I'm trying to create a file using code
string path = Environment.GetFolderPath(Environment.SpecialFolder.Personal);
string filename = Path.Combine(path, "myfile.txt");
using (var streamWriter = new StreamWriter(filename, true))
{
streamWriter.WriteLine(DateTime.UtcNow);
}
using (var streamReader = new StreamReader(filename))
{
string content = streamReader.ReadToEnd();
System.Diagnostics.Debug.WriteLine(content);
}
The above code sample is giving me exception
System.UnauthorizedAccessException: 'Access to the path 'C:\Users\hchittora\Documents\myfile.txt' is denied.'
Here is the full stacktrace
System.UnauthorizedAccessException
HResult=0x80070005
Message=Access to the path 'C:\Users\hchittora\Documents\myfile.txt' is denied.
Source=System.Private.CoreLib
StackTrace
at System.IO.FileStream.ValidateFileHandle(SafeFileHandle fileHandle)
at System.IO.FileStream.CreateFileOpenHandle(FileMode mode, FileShare share, FileOptions options)
at System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options)
at System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize)
at System.IO.StreamWriter..ctor(String path, Boolean append)
at FileHandlingSampleApplication.MainPage..ctor() in C:\Users\hchittora\Desktop\FileHandlingSampleApplication\FileHandlingSampleApplication\FileHandlingSampleApplication\MainPage.xaml.cs:line 19
at FileHandlingSampleApplication.App..ctor() in C:\Users\hchittora\Desktop\FileHandlingSampleApplication\FileHandlingSampleApplication\FileHandlingSampleApplication\App.xaml.cs:line 16
at FileHandlingSampleApplication.UWP.MainPage..ctor() in C:\Users\hchittora\Desktop\FileHandlingSampleApplication\FileHandlingSampleApplication\FileHandlingSampleApplication.UWP\MainPage.xaml.cs:line 24
at FileHandlingSampleApplication.UWP.FileHandlingSampleApplication_UWP_XamlTypeInfo.XamlTypeInfoProvider.Activate_4_MainPage() in C:\Users\hchittora\Desktop\FileHandlingSampleApplication\FileHandlingSampleApplication\FileHandlingSampleApplication.UWP\obj\x86\Debug\XamlTypeInfo.g.cs:line 255
at FileHandlingSampleApplication.UWP.FileHandlingSampleApplication_UWP_XamlTypeInfo.XamlUserType.ActivateInstance() in C:\Users\hchittora\Desktop\FileHandlingSampleApplication\FileHandlingSampleApplication\FileHandlingSampleApplication.UWP\obj\x86\Debug\XamlTypeInfo.g.cs:line 476
When I looked at the above issue, I come to know that UWP cannot directly interact with the system files. What can be another alternative to do so?

Answer 1

Because Xamarin.Forms runs on multiple platforms, each with its own file system, there is no single approach for loading and saving files created by the user.
I can not provide code for all platform here because you need to understand the fundamental for it. Check this for more details.

Answer 2

I'm using SecureStorage library with dependency injection to save on each platform. Although this is mostly used for token caching, you might find it useful.