RhSolutions-AddIn/RhSolutions.AddIn/AddIn/RhSolutionsFunction.cs

using ExcelDna.Integration;
using Microsoft.Extensions.DependencyInjection;
using RhSolutions.Models;
using RhSolutions.Services;
using System.Collections.Generic;
using System.Linq;

namespace RhSolutions.AddIn
{
    public class RhSolutionsFunction
    {
        [ExcelFunction(Description = "Распознать артикул и попробовать найти его в прайс-листе")]
        public static object RHSOLUTIONS([ExcelArgument(Name = "\"Строка с названием материала\"")] string line)
        {
            IDatabaseClient databaseClient = RhSolutionsAddIn.ServiceProvider.GetService<IDatabaseClient>();
            IEnumerable<Product> requestResult = ExcelAsyncUtil.Run("Database request", line, delegate
            {
                return databaseClient.GetProducts(line)
                    .GetAwaiter()
                    .GetResult();
            }) as IEnumerable<Product>;

            Sku.TryParse(line, out var skus);

            if (requestResult == null)
            {
                if (skus.Count() > 0)
                {
                    return $"{skus.First()} ...";
                }
                else
                {
                    return "Загрузка...";
                }
            }

            else
            {
                if (requestResult.Count() == 0 && skus.Count() == 0)
                {
                    return ExcelError.ExcelErrorNA;
                }

                else if (requestResult.Count() == 0)
                {
                    return $"{skus.First()}";
                }

                else
                {
                    var firstProduct = requestResult.First();
                    return $"{firstProduct.ProductSku} {firstProduct.Name}";
                }
            }
        }
    }
}