laatzen/LaaProductionWeb/LaaProduction.Services/Models/OrderInfoModel.cs

namespace LaaProduction.Services.Models
{
    using System.Collections.Generic;

    public class OrderInfoModel
    {
        public int OrderNr { get; set; }

        public int ProductionOrderNr { get; set; }

        public string Customer { get; set; }

        public string Nr 
            => this.OrderNr > 0 
            ? $"{this.OrderNr}" 
            : this.ProductionOrderNr > 0 
            ? $"{this.ProductionOrderNr}" 
            : default(string);

        public static readonly OrderInfoComparer Comparer 
            = new OrderInfoComparer();

        public class OrderInfoComparer : IEqualityComparer<OrderInfoModel>
        {
            public bool Equals(OrderInfoModel x, OrderInfoModel y)
                => x?.OrderNr == y?.OrderNr;

            public int GetHashCode(OrderInfoModel obj)
                => obj?.OrderNr ?? default(int);
        }
    }
}