Asp.net mvc 3 如何在视图MVC3 ASP.NET中查看多个表

我正在尝试使用MVC3 Razor中的LINQ从数据库中选择一个多表。为了查看视图中多个表中的多个数据，我需要对代码进行哪些更改

这是我的型号

public class DailyAttendance
{
    [Key]
    public string pnp { get; set; }
    public string student_id { get; set; }
    public string mth_yr_id { get; set; }
    public string D01 { get; set; }
    public string D02 { get; set; }
} // and so on

public class TitasDb : DbContext
{
    public DbSet<DailyAttendance> DailyAttendance { get; set; }
    public DbSet<MonthYear> MonthYear { get; set; }
    // and so on

}

这就是我试图查看数据的方式

@model IEnumerable<titas.Models.DailyAttendance>

@foreach (var item in Model) {
<tr>
    <td>
        @Html.DisplayFor(modelItem => item.student_id)
    <td>
</tr>
}

@model IEnumerable
@foreach（模型中的var项目）{
@DisplayFor（modeleItem=>item.student\u id）
}

我得到的错误是

The model item passed into the dictionary is of type 'System.Data.Entity.Infrastructure.DbQuery`1[<>f__AnonymousType5`2[titas.Models.DailyAttendance,titas.Models.Student]]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[titas.Models.DailyAttendance]'. 

传递到字典中的模型项的类型为“System.Data.Entity.Infrastructure.DbQuery`1[f_uAnonymousType5`2[titas.Models.DailAttendence，titas.Models.Student]]”，但此字典需要类型为“System.Collections.Generic.IEnumerable`1[titas.Models.DailAttendence]”的模型项。

与在每个ASP.NET MVC应用程序中一样，定义一个视图模型，该模型将包含您需要在视图中使用的所有信息：

public class MyViewModel
{
    public DailyAttendance DailyAttendance { get; set; }
    public Student Student { get; set; }
}

public class AttendanceModel
{
    public Student Student { get; set; }
    public DailyAttendance DailyAttendace { get; set; }
}

然后让控制器操作将此视图模型返回到视图：

public class AttendanceController : Controller
{
    TitasDb _attendanceModel = new TitasDb();

    public ActionResult Index()
    {
        var model = from s in _attendanceModel.Student
                    join ssc in _attendanceModel.StudentSchoolClass on s.student_id equals ssc.student_id
                    join sc in _attendanceModel.SchoolClass on ssc.school_class_id equals sc.school_class_id
                    join da in _attendanceModel.DailyAttendance on s.student_id equals da.student_id
                    join my in _attendanceModel.MonthYear on da.mth_yr_id equals my.mth_yr_id
                    where my.month_id == "M05"
                    where sc.teacher_id == "T1000001"
                    select new MyViewModel
                    { 
                        DailyAttendance = da, 
                        Student = s 
                    };
        return View(model.ToList());
    }
}

最后，将视图强类型化到视图模型：

@model IList<MyViewModel>
<table>
    <thead>
        <tr>
            <th>student id</th>
            <th>attendance id</th>
        </tr>
    </thead>
    <tbody>
        @for (var i = 0; i < Model.Count; i++)
        {
            <tr>
                <td>@Html.DisplayFor(x => x[i].Student.student_id)</td>
                <td>@Html.DisplayFor(x => x[i].DailyAttendance.attendance_id)</td>
            </tr>
        }
    </tbody>
</table>

现在，您的主要视图变成：

@model IList<MyViewModel>
<table>
    <thead>
        <tr>
            <th>student id</th>
            <th>attendance id</th>
        </tr>
    </thead>
    <tbody>
        @Html.DisplayForModel()
    </tbody>
</table>

@model-IList
学生证
考勤id
@Html.DisplayForModel（）

与在每个ASP.NET MVC应用程序中一样，定义一个视图模型，该模型将包含您需要在视图中使用的所有信息：

public class MyViewModel
{
    public DailyAttendance DailyAttendance { get; set; }
    public Student Student { get; set; }
}

public class AttendanceModel
{
    public Student Student { get; set; }
    public DailyAttendance DailyAttendace { get; set; }
}

然后让控制器操作将此视图模型返回到视图：

public class AttendanceController : Controller
{
    TitasDb _attendanceModel = new TitasDb();

    public ActionResult Index()
    {
        var model = from s in _attendanceModel.Student
                    join ssc in _attendanceModel.StudentSchoolClass on s.student_id equals ssc.student_id
                    join sc in _attendanceModel.SchoolClass on ssc.school_class_id equals sc.school_class_id
                    join da in _attendanceModel.DailyAttendance on s.student_id equals da.student_id
                    join my in _attendanceModel.MonthYear on da.mth_yr_id equals my.mth_yr_id
                    where my.month_id == "M05"
                    where sc.teacher_id == "T1000001"
                    select new MyViewModel
                    { 
                        DailyAttendance = da, 
                        Student = s 
                    };
        return View(model.ToList());
    }
}

最后，将视图强类型化到视图模型：

@model IList<MyViewModel>
<table>
    <thead>
        <tr>
            <th>student id</th>
            <th>attendance id</th>
        </tr>
    </thead>
    <tbody>
        @for (var i = 0; i < Model.Count; i++)
        {
            <tr>
                <td>@Html.DisplayFor(x => x[i].Student.student_id)</td>
                <td>@Html.DisplayFor(x => x[i].DailyAttendance.attendance_id)</td>
            </tr>
        }
    </tbody>
</table>

现在，您的主要视图变成：

@model IList<MyViewModel>
<table>
    <thead>
        <tr>
            <th>student id</th>
            <th>attendance id</th>
        </tr>
    </thead>
    <tbody>
        @Html.DisplayForModel()
    </tbody>
</table>

@model-IList
学生证
考勤id
@Html.DisplayForModel（）

您正在向视图发送匿名对象，并声明您的视图获得

IEnumerable

，但在这种情况下，这是不正确的。试着为它做个模型

public class MyModel
{
   public DailyAttendance dailyAttendance{ get; set; }
   public Student student { get; set; }
}

然后在控制器中，将数据填充到此模型中

    var model = (from s in _attendanceModel.Student
                join ssc in _attendanceModel.StudentSchoolClass on s.student_id equals ssc.student_id
                join sc in _attendanceModel.SchoolClass on ssc.school_class_id equals sc.school_class_id
                join da in _attendanceModel.DailyAttendance on s.student_id equals da.student_id
                join my in _attendanceModel.MonthYear on da.mth_yr_id equals my.mth_yr_id
                where my.month_id == "M05"
                where sc.teacher_id == "T1000001"
                select new MyModel { dailyAttendance = da, student = s }).ToList();

然后将其传递给视图，并像下面这样声明视图的模型

@model IEnumarable<MyModel>

@model IEnumarable

您正在向视图发送匿名对象，并声明您的视图获得

IEnumerable

，但在这种情况下，这是不正确的。试着为它做个模型

public class MyModel
{
   public DailyAttendance dailyAttendance{ get; set; }
   public Student student { get; set; }
}

然后在控制器中，将数据填充到此模型中

    var model = (from s in _attendanceModel.Student
                join ssc in _attendanceModel.StudentSchoolClass on s.student_id equals ssc.student_id
                join sc in _attendanceModel.SchoolClass on ssc.school_class_id equals sc.school_class_id
                join da in _attendanceModel.DailyAttendance on s.student_id equals da.student_id
                join my in _attendanceModel.MonthYear on da.mth_yr_id equals my.mth_yr_id
                where my.month_id == "M05"
                where sc.teacher_id == "T1000001"
                select new MyModel { dailyAttendance = da, student = s }).ToList();

然后将其传递给视图，并像下面这样声明视图的模型

@model IEnumarable<MyModel>

@model IEnumarable

问题是您正在传递一个匿名类型作为模型：

选择新的{dailyattendace=da，Student=s}

在视图中将模型定义为

@model IEnumerable

尝试创建特定于视图的模型：

public class MyViewModel
{
    public DailyAttendance DailyAttendance { get; set; }
    public Student Student { get; set; }
}

public class AttendanceModel
{
    public Student Student { get; set; }
    public DailyAttendance DailyAttendace { get; set; }
}

或者任何对你有用的东西。您可能还需要为学生和日常学员创建特定的视图模型

然后您可以更改您的模型：

@model IEnumerable

并选择：

选择新的考勤模式{DailyAttendance=da，Student=s}

---

希望这能让您走上正确的轨道。

问题是您正在传递一个匿名类型作为模型：

选择新的{dailyattence=da，Student=s}

，您在视图中将模型定义为

@model IEnumerable

尝试创建特定于视图的模型：

public class MyViewModel
{
    public DailyAttendance DailyAttendance { get; set; }
    public Student Student { get; set; }
}

public class AttendanceModel
{
    public Student Student { get; set; }
    public DailyAttendance DailyAttendace { get; set; }
}

或者任何对你有用的东西。您可能还需要为学生和日常学员创建特定的视图模型

然后您可以更改您的模型：

@model IEnumerable

并选择：

选择新的考勤模式{DailyAttendance=da，Student=s}

希望这能让你走上正轨