add async to GetProvinces method have Error #4410 | Support Center

ramezani583 created 7 years ago

hi, i can not change GetProvinces(same as getpeople method in step by step developing) to async!

when i changing "private readonly IRepository<Province.Province> _provinceRepository" to "private readonly IRepository<Province> _provinceRepository" i have error in build

and when changing "private readonly IRepository<Province> _provinceRepository" to "private readonly IRepository<Province.Province> _provinceRepository"

GetProvinces method have error!

List<Province>' does not contain a definition for 'GetAwaiter' and no extension method 'GetAwaiter' accepting a first argument of type 'List<Province>' could be found (are you missing a using directive or an assembly reference?)

public interface IProvinceAppService : IApplicationService { Task <ListResultDto<ProvinceListDto>> GetProvinces(GetProvincesInput input); Task CreateProvince(CreateProvinceInput input); Task DeleteProvince(EntityDto input); }

namespace SSoft.ResourceAssessmentsNetwork.BasicInfo.Provinces { [AbpAuthorize(AppPermissions.Pages_BasicInfo_Province)] public class ProvinceAppService : ResourceAssessmentsNetworkAppServiceBase, IProvinceAppService {

    private readonly IRepository&lt;Province.Province&gt; _provinceRepository;

    public ProvinceAppService(IRepository&lt;Province.Province&gt; provinceRepository)
    {
        _provinceRepository = provinceRepository;
    }
  
    [AbpAuthorize(AppPermissions.Pages_BasicInfo_Province_CreateProvince)]
    public async Task CreateProvince(CreateProvinceInput input)
    {
        var province = ObjectMapper.Map&lt;Province.Province&gt;(input);
        await _provinceRepository.InsertAsync(province);
    }
    [AbpAuthorize(AppPermissions.Pages_BasicInfo_Province_DeleteProvince)]
    public async Task DeleteProvince(EntityDto input)
    {
        await _provinceRepository.DeleteAsync(input.Id);
    }
  
    public async Task&lt;ListResultDto&lt;ProvinceListDto&gt;> GetProvinces(GetProvincesInput input)
    {
       var provinces = await _provinceRepository
            .GetAll()
            .WhereIf(
                !input.Filter.IsNullOrEmpty(),
                p => p.Name.Contains(input.Filter) 
            )
            .OrderBy(p => p.Name)
            .ToList();
        return new ListResultDto&lt;ProvinceListDto&gt;(provinces.MapTo&lt;List&lt;ProvinceListDto&gt;>());
    }
}

}

10 Answer(s)

aaron created 7 years ago

Support Team

public async Task<ListResultDto<ProvinceListDto>> GetProvinces(GetProvincesInput input)
{
   var provinces = await _provinceRepository
       .GetAll()
       .WhereIf(
           !input.Filter.IsNullOrEmpty(),
           p => p.Name.Contains(input.Filter)
       )
       .OrderBy(p => p.Name)
       .ToList();
   return new ListResultDto<ProvinceListDto>(provinces.MapTo<List<ProvinceListDto>>());
}

ToList does not return a Task, so it cannot be awaited. You can inject IAsyncQueryableExecuter and do:

public async Task<ListResultDto<ProvinceListDto>> GetProvinces(GetProvincesInput input)
{
    var query = _provinceRepository
        .GetAll()
        .WhereIf(
            !input.Filter.IsNullOrEmpty(),
            p => p.Name.Contains(input.Filter)
        )
        .OrderBy(p => p.Name);
    var provinces = await AsyncQueryableExecuter.ToListAsync(query); // This line
    return new ListResultDto<ProvinceListDto>(provinces.MapTo<List<ProvinceListDto>>());
}

Tip: Wrap your code in the following for formatting and readability:

[code]

[/code:28rmc8yk] A shortcut is to highlight your code and click on the </> button in the formatting toolbar.

0

ramezani583 created 7 years ago

How to inject IAsyncQueryableExecuter and do?

aaron created 7 years ago

Support Team

You can property-inject, like this:

public class ProvinceAppService : ResourceAssessmentsNetworkAppServiceBase, IProvinceAppService
{
    public IAsyncQueryableExecuter AsyncQueryableExecuter { get; set; }

    public ProvinceAppService(IRepository<Province.Province> provinceRepository)
    {
        // ...
        AsyncQueryableExecuter = NullAsyncQueryableExecuter.Instance;
    }
}

My previous post already shows the do part.

ramezani583 created 7 years ago

hi, i want get all record count for Grid Paging like this command " var provinceCount = await query.CountAsync();" but when write method

public class ProvinceAppService : ResourceAssessmentsNetworkAppServiceBase, IProvinceAppService
    {
 public IAsyncQueryableExecuter AsyncQueryableExecuter { get; set; }
        private readonly IRepository<Province> _provinceRepository;

        public ProvinceAppService(IRepository<Province> provinceRepository)
        {
            _provinceRepository = provinceRepository;
            AsyncQueryableExecuter = NullAsyncQueryableExecuter.Instance;

        }
public async Task<PagedResultDto<ProvinceListDto>> GetProvinces(GetProvincesInput input)
        {
            var query = _provinceRepository
              **<span style="color:#BF0000">  .WhereIf(</span>**
                    !input.Filter.IsNullOrWhiteSpace(),
                    p =>
                        p.Name.Contains(input.Filter)
                );
            var provinceCount = await query.CountAsync();

            var provinces = await query
                .OrderBy(input.Sorting)
                .PageBy(input)
                .ToListAsync();

            var provinceListDtos = ObjectMapper.Map<List<ProvinceListDto>>(provinces);

            return new PagedResultDto<ProvinceListDto>(
                provinceCount,
                provinceListDtos
                );
        }
{

I have error in ".WhereIf" <ins>'IRepository<Province>' does not contain a definition for 'WhereIf' and no extension method 'WhereIf' accepting a first argument of type 'IRepository<Province>' could be found (are you missing a using directive or an assembly reference?)</ins>

I forced to write this method as follows:

public class ProvinceAppService : ResourceAssessmentsNetworkAppServiceBase, IProvinceAppService
    {
 public IAsyncQueryableExecuter AsyncQueryableExecuter { get; set; }
        private readonly IRepository<Province> _provinceRepository;

        public ProvinceAppService(IRepository<Province> provinceRepository)
        {
            _provinceRepository = provinceRepository;
            AsyncQueryableExecuter = NullAsyncQueryableExecuter.Instance;

        }
public async Task<PagedResultDto<ProvinceListDto>> GetProvinces(GetProvincesInput input)
        {
            var query = _provinceRepository
                .GetAll()
                .WhereIf(
                    !input.Filter.IsNullOrWhiteSpace(),
                    p =>
                        p.Name.Contains(input.Filter)
                );
            var provinceCount = await query.CountAsync();

            var query1 = _provinceRepository
                .GetAll()
                .WhereIf(
                    !input.Filter.IsNullOrWhiteSpace(),
                    p =>
                        p.Name.Contains(input.Filter)
                )
                .OrderBy(p => input.Sorting)
                .PageBy(input);
            var provinces = await AsyncQueryableExecuter.ToListAsync(query1);


            var provinceListDtos = ObjectMapper.Map<List<ProvinceListDto>>(provinces);

            return new PagedResultDto<ProvinceListDto>(
                provinceCount,
                provinceListDtos
                );
        }
}

How can I fix this problem? Is there a better way?

0

aaron created 7 years ago
Support Team

There is no problem.

GetAll() simply returns Table.AsQueryable();

ramezani583 created 7 years ago

but i have compile Error in this way:

public async Task<PagedResultDto<ProvinceListDto>> GetProvinces(GetProvincesInput input)
        {
            var query = _provinceRepository
             .WhereIf
                    !input.Filter.IsNullOrWhiteSpace(),
                    p =>
                        p.Name.Contains(input.Filter)
                );
            var provinceCount = await query.CountAsync();

            var provinces = await query
                .OrderBy(input.Sorting)
                .PageBy(input)
                .ToListAsync();

            var provinceListDtos = ObjectMapper.Map<List<ProvinceListDto>>(provinces);

            return new PagedResultDto<ProvinceListDto>(
                provinceCount,
                provinceListDtos
                );
        }

0

aaron created 7 years ago
Support Team

Why would you remove GetAll(), when you know it works and it's the correct way?
0

ramezani583 created 7 years ago

when i use .getall(), a new error occurs!
0

aaron created 7 years ago
Support Team

Add: using System.Linq.Dynamic.Core;
0

ramezani583 created 7 years ago

THANK YOU VERY MUCH.

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