Question

请帮助以下

我有模特

public class TitleView
{
    public int Year;        
    public User User;
    public IEnumerable<Students> Student;
    public IEnumerable<Goal> Goals;
}



public class MyController: Controller
{
    private Db db = new Db();
    public ActionResult Index()
    {
        User User = new User();

        Student Student= from a in db.Students where a.Name==User.Name select a;

此行上的
错误，无法将类型IQueryable转换为学生。

        var test= (from a in db.Goals where a.StudentID== Student.ID select a).ToList();

我可以将第一行转换为List = .... ToList（）;但是之后在此行显示错误 - 使用a.StudentID == Student.ID

        var model = new TitleView()
        {
            User = User,
            Student= Student
        };
        return View(model);
    }

我知道这很简单

Answer 1

要从列表中获取单个实例，您需要致电First，FirstOrDefault，Single或SingleOrDefault

在此处详细了解：http://www.dotnettricks.com/learn/linq/understanding-single-singleordefault-first-and-firstordefault

ASP.NET，Linq和查询，如何在我的班级

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