My code returns Task<List<...>>. There is a type conversion error from Task<List<...>> to List<...>.

Tell me, please, where I did not finish await ?

    public async Task<List<DepartamentsResponse>> Handle(GetDepartmentsRequest token, CancellationToken cancellationToken)
    {
        var departments = await _departmentApiClient.GetReception(token.accessToken, OdpgDepartmentType.Reception);

        var result = departments.ConvertAll(async d => new DepartamentsResponse
        {
            FederalDistrict = GetFederalDistrictCode(d.FederalRegion.DistrictCode),
            SubjectName = d.Name,
            Supervisor = GetDirector(d.Users.Where(u => u.InOdpgRole(OdpgUserRole.Director)).FirstOrDefault()),
            ContactsSupervisor =  GetContacts(d.Users.Where(u => u.InOdpgRole(OdpgUserRole.Director)).FirstOrDefault()),
            Schedule = "C 9:00 18:00",
            ReceptionContacts = await GetAddressAsync(d.Addresses.FirstOrDefault(d => d.AddressType == DepartmentAddressType.Reception), token)

        });
        return result;
    }

    private async Task<string> GetAddressAsync(DepartmentAddressDto? address, GetDepartmentsRequest token)
    {
        if (address != null)
        {
            var fullAddress = await  _fiasApiClient.GetFullAddress(token.accessToken,
                new ESOG.Fias.Api.Model.GetFullAddressRequest
                { BaseAddressId = address.FiasId, Building = address.Building, Room = address.Room });
            //var res = JsonConvert.DeserializeObject<DepartmentAddress>(fullAddress);
            return fullAddress;
        }
        return "";
    }

GetFederalDistrictCode, GetDirector, GetContacts - these methods are not asynchronous

It should just return a List<>, not Task<List<>>

CodePudding user response：

Your call to departments.ConvertAll is returning a List<Task<DepartamentsResponse>>, but you want a Task<List<DepartamentsResponse>>.

Look at the Task.WhenAll method for how you would convert a collection of Tasks to a single Task that returns a collection. Then await that single Task and build your final list.