有没有一种方法，我可以选择从.INCLUDE只有某些字段（LINQ查询

Question

考虑以下几点：？

var questions = _questionsRepository 
    .GetAll() 
    .Where(q => q.Problem.SubTopicId == subTopicId || subTopicId == 0) 
    .Where(q => q.QuestionStatusId == questionStatusId || questionStatusId == 0) 
    .Where(q => q.AssignedTo == assignedTo || assignedTo == "0") 
    .Where(q => q.ModifiedBy == modifiedBy || modifiedBy == "0") 
    .Include(q => q.Problem) 
    .Include(q => q.Answers) 
    .ToList(); 

有没有一种方法，我可以返回问答数据加上只有场从表中的问题/类SubTopicId和ProblemId

Answer 1

尝试查询

var problems = _questionsRepository 
      .GetAll() 
      .Where(q => q.Problem.SubTopicId == subTopicId || subTopicId == 0) 
      .Where(q => q.QuestionStatusId == questionStatusId || questionStatusId == 0) 
      .Where(q => q.AssignedTo == assignedTo || assignedTo == "0") 
      .Where(q => q.ModifiedBy == modifiedBy || modifiedBy == "0") 
      .Include(q => q.Problem) 
      .Include(q => q.Answers) 
      .Select(x=>new 
       { 
        SubTopicId = x.Problem.SubTopicId, 
        ProblemId = x.Problem.ProblemId 
       }).ToList();