ASP.NET MVC一對一關聯數據不會顯示在索引頁面

Question

我的情況是產品有一個庫存。所以我在Stocks表上添加了ProductId。表中有這樣的記錄：

產品表：

ID |名稱|說明| SellingPrice

--------------------------------------------- ---

1 | product1 | desc | 10.20

2 | product2 | prod desc | 20.55

--------------------------------------------- ---

庫存表：

ID | ProductId |數量

--------------------------------------------- ---

1 | 1 | 100

2 | 2 | 250

--------------------------------------------- ---

現在在產品索引頁，我想這樣的顯示在HTML表中的數據：

<table border="1"> 
 
    <tr> 
 
    <th>Name</th> 
 
    <th>Description</th> 
 
    <th>Selling Price</th> 
 
    <th>Stock</th> 
 
    </tr> 
 
    <tr> 
 
    <td>product1</td> 
 
    <td>desc</td> 
 
    <td>10.20</td> 
 
    <td>100 (Note: I cannot see stock data when i open products index, this is what i want to see)</td> 
 
    </tr> 
 
    <tr> 
 
    <td>product2</td> 
 
    <td>product desc</td> 
 
    <td>20.55</td> 
 
    <td>250 (Note: I cannot see stock data when i open products index, this is what i want to see)</td> 
 
    </tr> 
 
</table>

下面是MVC代碼，我已經做至今：

public class Product 
{ 
    public int Id { get; set; } 
    [Required] 
    public string Name { get; set; } 
    [Required] 
    public string Description { get; set; } 
    public Decimal SellingPrice { get; set; } 

    public virtual Stock Stock { get; set; } 
} 



public class Stock 
{ 
    public int Id { get; set; } 
    public int Qty { get; set; } 
    public int ProductId { get; set; } 
    [Required] 
    public virtual Product Product { get; set; } 
} 

    // GET: Products 
    public ActionResult Index() 
    { 
     var products = db.Products.ToList(); 
     return View(products); 
    } 

<table class="table"> 
<tr> 
    <th> 
     @Html.DisplayNameFor(model => model.Name) 
    </th> 
    <th> 
     @Html.DisplayNameFor(model => model.Description) 
    </th> 
    <th> 
     @Html.DisplayNameFor(model => model.SellingPrice) 
    </th> 
    <th>@Html.DisplayNameFor(model => model.Stock)</th> 
    <th></th> 
</tr> 

@foreach (var item in Model) 
{ 
    <tr> 
     <td> 
      @Html.DisplayFor(modelItem => item.Name) 
     </td> 
     <td> 
      @Html.DisplayFor(modelItem => item.Description) 
     </td> 
     <td> 
      @Html.DisplayFor(modelItem => item.SellingPrice) 
     </td> 
     <td> 
      @Html.DisplayFor(modelItem => item.Stock.Qty) 
     </td> 
      <td> 
       @Html.ActionLink("Edit", "Edit", new { id = item.Id }) | 
       @Html.ActionLink("Details", "Details", new { id = item.Id }) | 
       @Html.ActionLink("Delete", "Delete", new { id = item.Id }) 
      </td> 
      </tr> 
} 

@ Html.DisplayFor（modelItem => item.Stock.Qty這段代碼沒有返回任何記錄，這就是爲什麼我在產品索引頁上看不到股票數據。任何幫助將不勝感激，謝謝！

這裏有附件，生成表格的截圖在SQL

Products table

Stocks table

Answer 1

您需要添加這對您的查詢：

//Don't forget to add this on your using statements 
using System.Data.Entity; 

var products = db.Products.Include(x=>x.Stock).ToList(); 

你需要這個包含擴展方法以便它與您的查詢表達到第一級關係。

更新您的產品型號爲好，包括你的股票模型ID：

public class Product 
{ 
public int Id { get; set; } 
[Required] 
public string Name { get; set; } 
[Required] 
public string Description { get; set; } 
public Decimal SellingPrice { get; set; } 

public virtual int StockID {get;set;} //Add this 
public virtual Stock Stock { get; set; } 
} 

不要忘了你的模型來更新數據庫。