asp.net 4.5 代码优先类并在列表视图中显示项目

Question

我创建了以下类然后使用实体优先方法成功创建了一个数据库：

using System;
using System.Collections.Generic;

using System.ComponentModel.DataAnnotations;

namespace HR_Test_v0_1.Models
{
    public class simStaff
    {
        [Key]
        public int simStaffId { get; set; }
        [Required(ErrorMessage ="You must enter a first name")]
        public string FirstName { get; set; } 
        [Required(ErrorMessage ="You must enter a last name")]
        public string LastName { get; set; }

        public simStaff simHoursRecorded { get; set; }
        public simPayRate simPayRate { get; set; }
    }

    public class simHoursRecorded
    {
        [Key]
        public int simHoursRecordId { get; set; }
        [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
        public DateTime DayWorked { get; set; }
        public int HoursBooked { get; set; }
        public bool AuthorisedToPay { get; set; }

        public int simStaffId { get; set; }
        public ICollection<simStaff> simStaff { get; set; }

    }

    public class simPayRate
    {
        [Key]
        public int simPayRateId { get; set; }
        public double RatePerHour { get; set; }
        public DateTime DateAppliesFrom { get; set; }

        public int simHoursTypeId { get; set; }       
        public ICollection<simHoursType> simHoursType { get; set; }

        public int simStaffId { get; set; }
        public ICollection<simStaff> simStaff { get; set; }
    }

    public class simHoursType
    {
        [Key]
        public int simHoursTypeId { get; set; }
        public string HoursType { get; set; }
        public simPayRate simPayRate { get; set; }
    }

}

我的上下文class如下：

public class EFContext : DbContext
{
    public EFContext() : base("name=HRTestContext")
    {

    }

    public DbSet<simStaff> simStaffs { get; set; }
    public DbSet<simHoursRecorded> simHoursRecordeds { get; set; }
    public DbSet<simPayRate> simPayRates { get; set; }
    public DbSet<simHoursType> simHoursType { get; set; }

}

我的Repository.cs文件中的相关摘录如下：

    public IEnumerable<simPayRate> GetPayRate
    {
        get
        {
            return context.simPayRates;
        }

    }

在 ListView 中，我有以下代码。然而，当我输入 Item.simHoursType 时，InsertItemTemplate 在 ItemTemplate 中起作用，我希望看到来自 simHoursType 实体的 HoursType 选项：

<ItemTemplate>
<tr>
 <td><%# Item.RatePerHour %></td>
 <td><%# Item.DateAppliesFrom.ToShortDateString() %></td>
 <td><%# Item.simHoursType %></td>

 <td>
 <asp:Button CommandName="Edit" Text="Edit" runat="server" />
 </td>
 </tr>
 </ItemTemplate>
   <InsertItemTemplate>
    <tr>
    <td><input id="RatePerHour" runat="server" 
           value="<%# BindItem.RatePerHour %>" /></td>
    <td><input id="DateAppliesFrom" runat="server" 
           value="<%# BindItem.DateAppliesFrom %>" /></td>
    <td>
        <asp:DropDownList ID="ddHoursType" 
                        runat="server"
                        AppendDataBoundItems="true"
                        SelectMethod="GetHoursType" 
                        DataTextField="HoursType"
                        DataValueField="simHoursTypeId"
                        SelectedValue="<%# BindItem.simHoursTypeId %>"
                        AutoPostBack="false" />
     </td>
     <td>
       <asp:Button CommandName="Insert" runat="server" text="Add" />
       <asp:Button CommandName="Cancel" runat="server" Text="Cancel" />
     </td>
     </tr>
     </InsertItemTemplate>

我可以更改 classes 的创建方式以便我可以输入 Item.simHoursType.HoursType，否则我应该如何显示 HoursType？

Answer 1

您不能这样做的原因似乎是因为 Item.simHoursType 实际上是 simHoursType 的 ICollection。要访问 HoursType，您必须访问该集合中的单个项目。例如：Item.simHoursType[0].HoursType.

Answer 2

Code First 约定不正确，它们应该如下：

public class simStaff
{
    [Key]
    public int simStaffId { get; set; }
    [Required(ErrorMessage ="You must enter a first name")]
    public string FirstName { get; set; }
    [Required(ErrorMessage ="You must enter a last name")]
    public string LastName { get; set; }

    public ICollection<simHoursRecorded> simHoursRecorded { get; set; }
    public ICollection<simPayRate> simPayRate { get; set; }
}

public class simHoursRecorded
{
    [Key]
    public int simHoursRecordId { get; set; }
    [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
    public DateTime DayWorked { get; set; }
    public int HoursBooked { get; set; }
    public bool AuthorisedToPay { get; set; }

    public int simStaffId { get; set; }
    public simStaff simStaff;
}

public class simPayRate
{
    [Key]
    public int simPayRateId { get; set; }
    public double RatePerHour { get; set; }
    public DateTime DateAppliesFrom { get; set; }

    public int? simHoursTypeId { get; set; }       
    public simHoursType simHoursType { get; set; }
    public int simStaffId { get; set; }
    public simStaff simStaff;
}

public class simHoursType
{
    [Key]
    public int simHoursTypeId { get; set; }
    public string HoursType { get; set; }

    public ICollection<simHoursType> simPayRate { get; set; }
}

那么需要在Repository.cs中使用include如下：

    public IEnumerable<simPayRate> GetPayRate
    {
        get
        {
            return context.simPayRates.Include("simHoursType");
        }

    }

asp.net 4.5 代码优先类并在列表视图中显示项目

asp.net 4.5 Code First Classes And Displaying Items In A Listview

c#

asp.net

listview

entity-framework

ef-code-first

asp.net 4.5 代码优先 类 并在列表视图中显示项目

asp.net 4.5 Code First Classes And Displaying Items In A Listview

c#

asp.net

listview

entity-framework

ef-code-first

asp.net 4.5 代码优先类并在列表视图中显示项目