How to concatenate address members in C# while dealing with nulls and commas

Question

I am trying to concatenate address lines eloquently, delimited by commas, but where a line is null, to omit the comma.

My current proposal is :

    public string fullAddress
    {
        get
        {
            return $"{address.line1 ?? ""}, {address.line2 ?? ""}, {address.line3 ?? "" } , {address.line4 ?? ""}"; 
        }

    }

But the above does not deal with the null commas. What would be a more eloquent way to achieve this?

Thanks in advance.

Answer 1

I'd put the items into an array, filter the nulls out then join them.

return string.Join(", ", new[]{address.line1, address.line2, address.line3, address.line4}.Where(s => s != null));

or as suggested in the comments by @Avin Kavish:

return string.Join(", ", new[]{address.line1, address.line2, address.line3, address.line4}.Where(s => !string.isNullOrWhiteSpace(s)));