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

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Depending on the version of Android you are using even with the permissions added in the manifest in 6.0 or up the user has to explicitly enable the permission when the app runs and on lower versions permission is asked during install. For example, on startup of the app I created a method to check if it is enabled and request permission if it’s not.

private void CheckAppPermissions()
{
    if ((int)Build.VERSION.SdkInt < 23)
    {
        return;
    }
    else
    {
        if (PackageManager.CheckPermission(Manifest.Permission.ReadExternalStorage, PackageName) != Permission.Granted
            && PackageManager.CheckPermission(Manifest.Permission.WriteExternalStorage, PackageName) != Permission.Granted)
        {
            var permissions = new string[] { Manifest.Permission.ReadExternalStorage, Manifest.Permission.WriteExternalStorage };
            RequestPermissions(permissions, 1);
        }
     }
}

You can also use the support library to do this, which is simpler and allows you to not have to check the Android version. For more info check out google’s documentation.

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