Explicit implementation of interface 'init' property accessor

[biqas]

Hi,

I hit the following limitation for initializing an explicitly implemented interface init property.

public class UserRoleEntity : IUserRole
{
    public UserRoleEntity(IUser user, IRole role)
    {
        ((IUserRole)this).User = user; // this here does not work, described above *.
        this.Role = role; // this here does not work because IRole not RoleEntity.
    }

    public UserEntity User { get; init; }
    public RoleEntity Role { get; init; }

    IUser IUserRole.User { get; init; }
    IRole IUserRole.Role { get; init; }
}

public interface IUserRole
{
    IUser User { get; init; }
    IRole Role { get; init; }
}

Is there a possibility to initialize the property?

* Init-only property or indexer can only be assigned in an object initializer, or on 'this' or 'base' in an instance constructor or an 'init' accessor.

[jnm2]

Side question, is it really preferable to allow the explicitly implemented properties to be set to something different than the public properties? I would have anticipated seeing this:

    public UserEntity User { get; init; }
    public RoleEntity Role { get; init; }

    IUser IUserRole.User => User;
    IRole IUserRole.Role => Role;

[biqas]

@jnm2
Because I'm in control of this I have already changed to the same one you are describing, but what would I do if not in control??

[jnm2]

@biqas If you find yourself needing to set explicitly implemented properties that were created with init accessors, you'd need to inform whoever created the class that C# doesn't allow such properties to be set.

[333fred]

We explicitly looked at this, and rejected the feature: https://github.com/dotnet/csharplang/blob/master/meetings/2021/LDM-2021-01-27.md#init-only-access-on-conversion-on-this.