Question

我有这个查询

[HttpGet]
public List<AttachedPhotosModel> GetReportAttachedPhotos(int reportId)
{
  var photos = new ReportsRepository().GetInjuryPhotos(reportId);

  return photos.Select(x => new AttachedPhotosModel()
  {
    Id = x.Id,
    Type = x.InjuryType,
    Photos = photos.Where(y => y.InjuryType == x.InjuryType).Select(z => z.ServicePhotoUrl).ToList()
  }).ToList();
}

我需要GroupBy InjuryType，怎么做？

我添加了return photos.GroupBy(k => k.InjuryType).Select(x => new AttachedPhotosModel()，但如何选择模型，x有新值key，我不知道如何选择我的数据

Answer 1

此代码应该有效。假设照片是具有InjuryType属性和PhotoUrl属性的对象的集合，而AttachedPhotosModel具有像这样的InjuryType和Photos属性。

public class AttachedPhotosModel
{
    public string InjuryType { set; get; }
    public List<string> Photos { set; get; }
}

按InjurType进行分组的代码。

var grouped = photos
           .GroupBy(s => s.InjuryType,d => d.PhotoUrl, (k, g) => new
                  AttachedPhotosModel
                  {
                     InjuryType = k,
                     Photos = g.ToList()
                  }).ToList();

将GroupBy添加到Select

1 个答案: