RhSolutions-AddIn/src/AddIn/Functions.cs

using ExcelDna.Integration;
using RhSolutions.Services;

namespace RhSolutions.AddIn
{
    public class Functions
    {
        [ExcelFunction(Description = "Запрос в удаленную базу данных")]
        public static object RHSOLUTIONS([ExcelArgument(Name = "Запрос")] string line)
        {
            object result;

            result = ExcelAsyncUtil.Run("Database request", line, delegate
            {
                return RhDatabaseClient.GetProduct(line).GetAwaiter().GetResult();
            });

            if (result == null)
            {
                return ExcelError.ExcelErrorNA;
            }

            if (result.Equals(ExcelError.ExcelErrorNA))
            {
                return "Загрузка...";
            }

            return result;
        }

        [ExcelFunction]
        public static void ResetStatusBar()
        {            
            RhSolutionsAddIn.Excel.StatusBar = false;
        }
    }
}