C# 虽然使用了TOLIST,但无法翻译LINQ表达式
我有以下代码,首先创建一个列表对象C# 虽然使用了TOLIST,但无法翻译LINQ表达式,c#,entity-framework,linq,C#,Entity Framework,Linq,我有以下代码,首先创建一个列表对象assessmentItems,然后在LINQ中使用它来获取CurrentScore List<AssessmentItem> assessmentItems = _context.AssessmentItems .Include(ai => ai.Assessment).ThenInclude(assess => assess.Evaluator) .Where(ai =>
assessmentItems
,然后在LINQ中使用它来获取CurrentScore
List<AssessmentItem> assessmentItems =
_context.AssessmentItems
.Include(ai => ai.Assessment).ThenInclude(assess => assess.Evaluator)
.Where(ai => ai.IsActive &&
ai.Assessment.PeerReviewAssignmentId == peerReviewAssignmentId &&
ai.Assessment.RubricId == rubricId).ToList();
List<RubricDTO> resultToReturn = _context.Rubrics
.Include(r => r.RubricItemCategories)
.Where(r => r.Id == rubricId)
.Select(r => new RubricDTO
{
Ranking = r.Ranking,
Description = r.Description,
RubricItemCategories = r.RubricItemCategories.Select(ric => new RubricItemCategoryDTO
{
Id = ric.Id,
Description = ric.Description,
RubricItems = ric.RubricItems.Select(ri => new RubricItemDTO
{
Id = ri.Id,
Title = ri.Title,
CurrentScore = assessmentItems.Count > 0 ? assessmentItems
.Where(aitem2 => aitem2.RubricItemId == ri.Id && aitem2.Assessment.EvaluatorId == userId)
//.Take(1)
.Select(s => s.CurrentScore)
.FirstOrDefault() : 0,
})
}).OrderBy(ric => ric.Order).ToList()
}).ToList();
更多信息
你知道为什么会发生这种情况吗?让我帮助你简化你的查询。不需要包含,因为您有自定义投影。如果为子查询元素添加ToList
,则它将不可翻译。如果需要可翻译查询,请使用IQueryable
var assessmentItems=\u context.assessmentItems
.其中(ai=>ai.IsActive&&
ai.Assessment.PeerReviewAssignmentId==PeerReviewAssignmentId&&
ai.Assessment.RubricId==RubricId);
var resultToReturn=\u context.Rubrics
其中(r=>r.Id==rubricId)
.选择(r=>new RubricDTO
{
排名=r.排名,
描述=r.描述,
RubricItemCategories=r.RubricItemCategories.Select(ric=>new-rubricitemcategoridto
{
Id=ric.Id,
描述=ric.描述,
RubricItems=ric.RubricItems.Select(ri=>newrubricitemdto
{
Id=ri.Id,
Title=ri.Title,
CurrentScore=评估项目
.Where(aitem2=>aitem2.RubricItemId==ri.Id&&aitem2.Assessment.EvaluatorId==userId)
.选择(s=>s.CurrentScore)
.FirstOrDefault(),
})
}).OrderBy(ric=>ric.Order).ToList()
}).ToList();
而是因为使用了ToList
。