c# – 使用linq Group运算符展平查询结果的正确方法是什么

public Class PaperResult 
{
    public Guid SubjectId {get;set}

    public Guid StudentId {get;set}

    public string Name {get;set}

    public string Email {get;set}

    public int Marks {get;set}

}

我的疑问是

1. var resultEntities = _repository.Query<PaperResult>().where(t => t.Id == testId)
2. studentResults = resultEntities.GroupBy(x => x.StudentId)

返回,IQueryable,现在我把它投射到课堂上

public Class StudentResult 
{
    public Guid StudentId {get;set}

    public string Name {get;set}

    public string Email {get;set}

    public int Marks {get;set}

    public IEnumerable<PaperResult> PaperResults {get;set;}
}

我试图使用下面的linq来展平结果,但是Nhibernate抛出“方法或操作没有实现.”.

from paperResult in studentResults
let studentResult  = paperResult.First()
select new StudentResult()
{
    StudentId =studentResult.StudentId,Name =studentResult.Name,Email =studentResult.Email,Marks =studentResult.Marks,PaperResults =resultEntities.Where(x => x.StudentId ==studentResult.StudentId
                  select new PaperResult(){...}.ToList()
}

注意：代码是一个骨架代码.

问候,