public static async Task <IDictionary <string, IEnumerable <Employee> > > GetEmployeesGroupedAsync(this IEmployeeListProvider employeeListProvider)
{
IEnumerable <Employee> employees = await employeeListProvider.GetEmployeesAsync();
Dictionary <string, IEnumerable <Employee> > employeesByDepartments = new Dictionary <string, IEnumerable <Employee> >();
foreach (Employee employee in employees)
{
string departmentName = employee.Department ?? "Без отдела";
IEnumerable <Employee> list;
if (!employeesByDepartments.TryGetValue(departmentName, out list))
{
list = new List <Employee>();
employeesByDepartments.Add(departmentName, list);
}
((List <Employee>)list).Add(employee);
}
return(employeesByDepartments);
}
public ReportBuilder(IEmployeeListProvider employeeListProvider)
{
this.employeeListProvider = employeeListProvider;
}
