Xamarin: Android: System.Unauthorizedaccessexception: Access to The Path Is Denied

Xamarin : Android : System.UnauthorizedAccessException: Access to the path is denied

Ok I Fixed it by changing the saving location to
System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal)

Don't ask me why that worked when they need the same permissions but it did.

System.UnauthorizedAccessException: Access to the path denied- Xamarin

Welcome to Android 8. I also had this problem.

Turns out ReadExternalStorage is not sufficient anymore. If you go to app settings you will see that there is no read or write setting, only File access. To fix the problem request both read and write permissions and check them both as well:

{ Manifest.Permission.ReadExternalStorage, Manifest.Permission.WriteExternalStorage }

Is not it about writing?
System.IO.File.WriteAllBytes(externalPath, PdfBytes);

According to the docs it should work for reading, but in fact it didn't work for me.

According to docs:

Permissions

Prior to Android 8.0 (API level 26), if an app requested a permission
at runtime and the permission was granted, the system also incorrectly
granted the app the rest of the permissions that belonged to the same
permission group, and that were registered in the manifest.

For apps targeting Android 8.0, this behavior has been corrected. The
app is granted only the permissions it has explicitly requested.
However, once the user grants a permission to the app, all subsequent
requests for permissions in that permission group are automatically
granted.

For example, suppose an app lists both READ_EXTERNAL_STORAGE and
WRITE_EXTERNAL_STORAGE in its manifest. The app requests
READ_EXTERNAL_STORAGE and the user grants it. If the app targets API
level 25 or lower, the system also grants WRITE_EXTERNAL_STORAGE at
the same time, because it belongs to the same STORAGE permission group
and is also registered in the manifest. If the app targets Android 8.0
(API level 26), the system grants only READ_EXTERNAL_STORAGE at that
time; however, if the app later requests WRITE_EXTERNAL_STORAGE, the
system immediately grants that privilege without prompting the user.

MAUI :System.UnauthorizedAccessException: Access to the path is denied

Actually, if you just operate the file in the System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal) path, it shouldn't need any storage permissions. Because it's the app's own private folder. And I have tested your code in a new project, the josn file was created successfully.

In addition, if you want to request the permission in the maui, you need to use the api in the maui. You can use the following code instead of the yours.

 PermissionStatus statusread = await Permissions.RequestAsync<Permissions.StorageRead>();
 PermissionStatus statuswrite = await Permissions.RequestAsync<Permissions.StorageWrite>();

Finally, you can also use the permission Mahesh mentioned, but it should be used if necessary. And if you still want to it, you can try to add the following code in the MainActivity to grant the permission by the user.

protected override void OnCreate(Bundle savedInstanceState)
{
    if (!Android.OS.Environment.IsExternalStorageManager)
    {
        Intent intent = new Intent();
        intent.SetAction(Android.Provider.Settings.ActionManageAppAllFilesAccessPermission);
        Android.Net.Uri uri = Android.Net.Uri.FromParts("package", this.PackageName, null);
        intent.SetData(uri);
        StartActivity(intent);
    }
    base.OnCreate(savedInstanceState);
}

Access to path denied (Xamarin/Android)

You should enable READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE permissions in Android.
You can follow this blog to enable the permission in runtime
https://devblogs.microsoft.com/xamarin/requesting-runtime-permissions-in-android-marshmallow/

unauthorized access exception - access to the path denied - API29

in my case the solution was use the path defined

var fileName = global::Android.OS.Environment.ExternalStorageDirectory.AbsolutePath

System.UnauthorizedAccessException on Android Xamarin

If you are targeting anything above android Marshmallow, not all permissions are going to be granted even if specified in the Manifest.

1) You need to specify the permissions you'll need (in this case read/write permissions maybe?) in the manifest.

2) You'll need to request permissions during runtime using PermissionsPlugin (developed by good old James Montemagno!).

It's a really nice permissions library that's crazy simple to use. Go check it out and see if this fixes your issue.

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