Pass Permissiion to a Class

Question

Hi,

I am trying below code to pass a Permission as parameter so I can use it this way:

CheckAndRequestPermission(Permissions.Photo);

but getting this error:

Error CS0721: 'Permissions': static types cannot be used as parameters

using System;
using System.Threading.Tasks;
using Xamarin.Essentials;

namespace MyApp
{
    public class PermissionCheck
    {
        public async Task<PermissionStatus> CheckAndRequestPermission(Permissions permission)
        {
            var status = await Permissions.CheckStatusAsync<Permissions.Photos>();

            if (status == PermissionStatus.Granted) return status;

            if (status == PermissionStatus.Denied && DeviceInfo.Platform == DevicePlatform.iOS)
            {
                status = await Permissions.RequestAsync<Permissions.Photos>();

                return status;
            }

            if (Permissions.ShouldShowRationale<Permissions.Photos>())
            {
                status = await Permissions.RequestAsync<Permissions.Photos>();

                return status;
            }

            status = await Permissions.RequestAsync<Permissions.Photos>();

            return status;
        }
    }
}

Answer 1

Try something like this:

public async Task<PermissionStatus> CheckAndRequestPermission<P>( ) where P : BasePermission, new()
{
   var status = await Permissions.CheckStatusAsync<P>();

   . . .  use <P> instead of <Permissions.Photos>
}

Usage: CheckAndRequestPermission<Permissions.Photos>( ).

Answer 2

Permissions.Photos looks like it's a BasePlatformPermission/BasePermission from what I'm seeing in the Xamarin.Essentials repo, so you could try switching your CheckAndRequestPermission method to accept one of those instead. The Permissions type is static so you wouldn't be able to pass in an instance like you are atm.