添加对象列表到实体框架中创建的 DTO c#

Question

我的 c# controller 中有以下代码，

[HttpGet("antifungal/{name}")]
public List<DrugInteractionDTO> test(string name)
{
    var DI = (from D1 in _context.DrugInteractions
              join D2 in _context.DrugInteractionReferences
              on D1.ID equals D2.DrugInteractionId into joined
              from D3 in joined.DefaultIfEmpty()
              where D1.AntifungalAgent.Name.ToLower().Contains(name.ToLower())
              select new DrugInteractionDTO
              {
                Severity = D1.Severity,
                SeverityAsString = D1.Severity.ToString(),
                ProDetailedInformation = D1.ProDetailedInformation,
                BasicDetailedInformation = D1.BasicDetailedInformation,
                Antifungal = D1.AntifungalAgent.Name,
                InteractingDrug = D1.InteractingDrug.GenericName,
                ID = D1.ID,
                Count = 2
                //DrugInteractionReferences
              }).ToList();

    return DI.OrderBy(x => x.InteractingDrug).ToList();
}

我的DrugInteractionDTO model 有一个我想添加到的字段List<DrugInteractionReferences> 。

我的两个表是interactions和references每个交互可以有很多引用。

我习惯于使用 Java (Spring)，我不知道如何返回属于 DTO 中每个交互的引用。 我正在帮助的当前应用程序非常旧并且存在很多问题。

是否可以将引用列表添加到在此代码中创建的每个 interactionDTO？

Answer 1

它被称为 Eager Loading 查询，详细实体应该不是通过join而是通过子查询表达式来检索：

var DI = (from D1 in _context.DrugInteractions
          where D1.AntifungalAgent.Name.ToLower().Contains(name.ToLower())
          select new DrugInteractionDTO
          {
              Severity = D1.Severity,
              SeverityAsString = D1.Severity.ToString(),
              ProDetailedInformation = D1.ProDetailedInformation,
              BasicDetailedInformation = D1.BasicDetailedInformation,
              Antifungal = D1.AntifungalAgent.Name,
              InteractingDrug = D1.InteractingDrug.GenericName,
              ID = D1.ID,
              Count = 2,
              DrugInteractionReferences = _context.DrugInteractionReferences
                  .Where(D2 => D2.DrugInteractionId == D1.ID)
                  .ToList()
          }).ToList();

如果遇到性能问题，请在最后一个 .ToList( .AsSplitQuery() .ToList()