CourseWork_Bank/Bank/BankContracts/ViewModels/PurchaseViewModel.cs

using BankDataModels;
using System.ComponentModel;
using BankDataModels.ProxyModels;
using System.Text;

namespace BankContracts.ViewModels
{
    public class PurchaseViewModel : IPurchaseModel
    {
        public int Id { get; set; }
        public int ClientId { get; set; }
        [DisplayName("Логин клиента")]
        public string ClientPhoneNumber { get; set; } = string.Empty;
        [DisplayName("Дата Покупки")]
        public DateOnly DatePurchase { get; set; } = DateOnly.FromDateTime(DateTime.Now);
        public Dictionary<int, OperationByPurchaseModel> OperationsModel { get; set; } = new();

        public List<CostViewModel> CostViewModels { get; set; } = new();

        public List<OperationViewModel> OperationViewModels { get; set; } = new();

        public override string ToString()
        {
            var result = new StringBuilder(
                    $"Сделка, созданная {DatePurchase}, включает в себя операции:");
            for (int i = 0; i < OperationViewModels.Count; i++)
            {
                var operation = OperationViewModels[i];
                if (operation == null)
                {
                    break;
                }
                result.Append($"\n\t{i + 1}. {operation.Mark} {operation.Model} стоимостью {operation.Price}");
            }
            return result.ToString();
        }
    }
}