Question about Setting/Unsetting flags

[GregFaaborg]

I'm trying to detect whether there has been a change to my roles permissions by comparing the old permission value with the new one. But it seems that beyond some threshold when I set a permission via SetFlag and then attempt to unset via UnsetFlag it doesn't unset it. See the video below for clarity.

Recording.2024-07-10.140316.mp4

Notice as I click the check boxes the permissions UniqueId string changes up top from it original value of "YwAA" and the "Confirm Changes" button enables and disables indicating a change in the permission has been detected or there has been no change. This is working as expected. But when I check "CanPlaceHolder9" and uncheck it, it doesn't seem to unset that flag. Maybe I am just doing it improperly. I have attached a reproducible example you can check out. The relevant files are Permission.cs, ApplicationRoleDtoExtensions.cs, PermissionMappingGrid.razor.cs, PermissionMappingGrid.razor.
BlazorApp1.zip

[alirezanet]

Hi @GregFaaborg,
The issue lies with your base permission. Currently, you're using Permission.None, but you should use ~Permission.All to ensure the bit length covers all possible features. If you modify the method accordingly, it should resolve the problem.

  private Task SetRolesAsync()
  {
    List<ApplicationRoleDto> roles = [];
    var basePermission = (~Permission.All).ToUniqueId(); // this must the base-permission which has the max length 
    for (var i = 0; i < 5; i++)
    {
      roles.Add(new ApplicationRoleDto()
      {
        ApplicationRoleId = i,
        Name = $"Role{i}",
        Description = $"Descr{i}",
        Permission = basePermission
      });
    }

    _roles = roles;
    return Task.CompletedTask;
  }

here you can see the difference

Console.WriteLine(Permission.None.ToBinaryString()); // 0
Console.WriteLine((~Permission.All).ToBinaryString()); // 000000000000000000000

alternatively you can use this as None:

public static readonly Flag<Permission> None = ~All;

[GregFaaborg]

@alirezanet Ah I see, thank you very much!