[ASP.NET][MVC]Multiple Models(二)ExpandoObject、Tuple、View Model

2016-11-19

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MVC Model

接續前一篇傳遞多個Model到前端的檢視(View)上，上一篇使用MVC 常用的資料容器，這一篇則使用View Result下的Model來傳遞；由於Model是object 型別，試著變形: return View(TupleModel)、return View(ExpandoObject)、return View(viewmodel)。

三部曲之續集:

(一)ViewBag、ViewData、TempData
(二)ExpandoObject、Tuple、View Model
(三)Partial View、AJAX

Tuple

以Tuple的方式將多個Model放入項目序列的資料結構中，如果用上了C#7.0就可以取代tuple元素預設的Item1、Item2，可以有更好的敘述名稱，更佳!這邊先回到C# 6.0。

1.打開上一篇的F1Controller.cst程式，編寫新增以下程式碼

public ActionResult TupleIndex()
{
    var TupleModel = new Tuple<List<F1Team>, List<F1Driver>>(repository.GetTeams(), repository.GetDrivers());
    return View(TupleModel);
}

2.新增檢視TupleIndex.cshtml

@using MultiModel.Models;
@model Tuple<List<F1Team>, List<F1Driver>>
<html>
<body>
    <h2>Tuple</h2>
    <h3>車隊</h3>
    <table id="Teamlist" class="table table-hover">
        <thead>
            <tr>
                <td>車隊名稱</td>
                <td>年度世界冠軍次數</td>
                <td>國籍</td>
            </tr>
        </thead>
        <tbody>
            @foreach (F1Team items in Model.Item1)
            {
                <tr>
                    <td>@items.Name</td>
                    <td>@items.ChampionshipTitles</td>
                    <td>@items.Country</td>
                </tr>
            }
        </tbody>
    </table>
    <h3>車手</h3>
    <table id="Driverlist" class="table table-hover">
        <thead>
            <tr>
                <td>車手姓名</td>
                <td>車隊</td>
                <td>國籍</td>
                <td>年度世界冠軍次數</td>
            </tr>
        </thead>
        <tbody>
            @foreach (F1Driver items in Model.Item2)
            {
                <tr>
                    <td>@items.Name</td>
                    <td>@items.Team</td>
                    <td>@items.Country</td>
                    <td>@items.WDCs</td>
                </tr>
            }
        </tbody>
    </table>
</body>
</html>

Intellisense

也是從Model那一層就出現，不過因為是Tuple，在C#7之前，還是Item1、Item2...

測試結果:傳遞成功!

ExpandoObject

以屬性的方式將多個Model合併到一個Dynamic(ExpandoObject)中

1.打開F1Controller.cst程式，編寫新增以下程式碼

public ActionResult DynamicIndex()
{
    dynamic d = new ExpandoObject();
    d.F1Teams = repository.GetTeams();
    d.F1Drivers = repository.GetDrivers();
    return View(d);
}

2.新增檢視DynamicIndex.cshtml


@using MultiModel.Models;
@model dynamic
<html>
<body>
    <h2>Dynamic(ExpandoObject)</h2>
    <h3>車隊</h3>
    <table id="Teamlist" class="table table-hover">
        <thead>
            <tr>
                <td>車隊名稱</td>
                <td>年度世界冠軍次數</td>
                <td>國籍</td>
            </tr>
        </thead>
        <tbody>
            @foreach (F1Team items in Model.F1Teams)
            {
                <tr>
                    <td>@items.Name</td>
                    <td>@items.ChampionshipTitles</td>
                    <td>@items.Country</td>
                </tr>
            }
        </tbody>
    </table>
    <h3>車手</h3>
    <table id="Driverlist" class="table table-hover">
        <thead>
            <tr>
                <td>車手姓名</td>
                <td>車隊</td>
                <td>國籍</td>
                <td>年度世界冠軍次數</td>
            </tr>
        </thead>
        <tbody>
            @foreach (F1Driver items in Model.F1Drivers)
            {
                <tr>
                    <td>@items.Name</td>
                    <td>@items.Team</td>
                    <td>@items.Country</td>
                    <td>@items.WDCs</td>
                </tr>
            }
        </tbody>
    </table>

</body>
</html>

測試結果:傳遞成功!

View Model

以屬性的方式將多個Model合併到一個View Model中，好處是Intellisense、強型別及安全性，這也是老師和同學都推薦的作法!

1.Model資料夾新增一個F1VM的Model

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MultiModel.Models
{
    public class F1VM
    {
        public IEnumerable<F1Team> F1Teams { get; set; }
        public IEnumerable<F1Driver> F1Drivers { get; set; }
    }
}

2.打開F1Controller.cst程式，編寫新增以下程式碼

public ActionResult ViewModelIndex()
{
    F1VM viewmodel = new F1VM();
    viewmodel.F1Teams = repository.GetTeams();
    viewmodel.F1Drivers = repository.GetDrivers();
    return View(viewmodel);
}

3.新增檢視ViewModelIndex.cshtml


@using MultiModel.Models;
@model F1VM 
<html>
<body>
    <h2>ViewModel</h2>
    <h3>車隊</h3>
    <table id="Teamlist" class="table table-hover">
        <thead>
            <tr>
                <td>車隊名稱</td>
                <td>年度世界冠軍次數</td>
                <td>國籍</td>
            </tr>
        </thead>
        <tbody>
            @foreach (F1Team items in Model.F1Teams)
            {
                <tr>
                    <td>@items.Name</td>
                    <td>@items.ChampionshipTitles</td>
                    <td>@items.Country</td>
                </tr>
            }
        </tbody>
    </table>
    <h3>車手</h3>
    <table id="Driverlist" class="table table-hover">
        <thead>
            <tr>
                <td>車手姓名</td>
                <td>車隊</td>
                <td>國籍</td>
                <td>年度世界冠軍次數</td>
            </tr>
        </thead>
        <tbody>
            @foreach (F1Driver items in Model.F1Drivers)
            {
                <tr>
                    <td>@items.Name</td>
                    <td>@items.Team</td>
                    <td>@items.Country</td>
                    <td>@items.WDCs</td>
                </tr>
            }
        </tbody>
    </table>

</body>
</html>

Intellisense

從Model那一層就出現!