Question

我有一个使用此控制器填充的列表视图：

        public ActionResult ListClubMembershipType(int clubId)
    {
        //Populate the list
        var types = from s in db.MembershipTypes
                    where (s.ClubId == clubId)
                    orderby s.Type
                    select s;
        ViewBag.typesCount = types.Count();
        var model = types.Select(t => new ListMembershipTypeViewModel            
    {
        Type = t.Type,
        ClubId = clubId,
        Cost = t.Cost,
        ReducedCost = t.ReducedCost,
        MinAge = t.MinAge,
        MaxAge = t.MaxAge,
    });

        return PartialView("_ListClubMembershipType", model);
    }

我还想在名为ReducedDate的视图模型中填充一个变量，其中包含从其他两个表中提取的数据，Day＆amp;一个月。

我尝过以下几行：

            ReducedDate = db.Days.Find(t.DayId).DayNum + "/" + db.Months.Find(t.MonthId).MonthName,

但它会出现以下错误：

其他信息：方法＆＃39; GRCWebApp.Models.Day Find（System.Object []）＆＃39;声明类型＆＃39; System.Data.Entity.DbSet1 [GRCWebApp.Models.Day]＆＃39;无法使用类型＆System; System.Data.Entity.Core.Objects.ObjectQuery1 [GRCWebApp.Models.Day]＆＃39;

的实例调用

引用数据的正确方法是什么？

模型是：

MembershipType

public int MembershipTypeId { get; set; }

[StringLength(150)]
[Column(TypeName = "nvarchar")]
public String Type { get; set; }

[StringLength(350)]
[Column(TypeName = "nvarchar")]
public String Description { get; set; }

[Column(TypeName = "int")]
public int ClubId { get; set; }

[Column(TypeName = "decimal")]
public Decimal Cost { get; set; }

[Column(TypeName = "decimal")]
public Decimal ReducedCost { get; set; }

[Column(TypeName = "int")]
public int? DayId { get; set; }

[Column(TypeName = "int")]
public int? MonthId { get; set; }

[Column(TypeName = "int")]
public int MinAge { get; set; }

[Column(TypeName = "int")]
public int MaxAge { get; set; }

[Column(TypeName = "bit")]
public bool? Dormant { get; set; }
}

日模型：

public class Day
{
public int DayId { get; set; }

[Column(TypeName = "int")]
public int DayNum { get; set; }

public virtual ICollection<MembershipType> MembershipTypes { get; set; }
}

月份模型：

    public class Month
{
public int MonthId { get; set; }

[Column(TypeName = "nvarchar")]
public String MonthName { get; set; }

public virtual ICollection<MembershipType> MembershipTypes { get; set; }
}

ViewModel是：

    public class ListMembershipTypeViewModel
{
[Display(Name = "Type")]
public String Type { get; set; }

public int ClubId { get; set; }

[Display(Name = "Full Cost")]
public Decimal Cost { get; set; }

[Display(Name = "Reduced Cost")]
public Decimal ReducedCost { get; set; }

[Display(Name = "Reduced From")]
public string ReducedDate { get; set; }

[Display(Name = "Min Age")]
public int MinAge { get; set; }

[Display(Name = "Max Age")]
public int MaxAge { get; set; }
}

Answer 1

DayId上有MonthId和MembershipType，但您不具备public Day Day {get;set;}和public Month Month {get;set;}

的属性

如果你有这些属性，你可以使用ReducedDate = t.Day.DayNum + "/" + t.Month.MonthName

这可能会给您一个错误，因为DayNum是一个整数，因此您需要将DayNum转换为string。您可以使用SqlFunctions.StringConvert((double)t.Day.DayNum)执行此操作。

使用相关信息填充列表

1 个答案: