添加在MVC一个DropDownList [英] Adding a dropdownlist in MVC

问题描述

如果MVC只允许你有每查看某个视图模型，一个人如何融入一个DropDownList（需要有这样一个独立的视图模型），其中已被其他视图模型现有的View（即其中有一栏的实体这个DropDownList的）？

If MVC only allows you to have one ViewModel per View, how does one incorporate a dropdownlist (need to have a separate ViewModel for this) into an existing View which is already used by another ViewModel (ie an entity which has a column for this dropdownlist)?

推荐答案

此问题，此外，我想，有你正在寻找的一切：

This Question in addition, I guess, Got everything you are looking for:

如何写一个简单的Html.DropDownListFor（）？

作为一个初学者，我只做使用​​Northwind数据库DROPDOWNLIST的一个非常基本的实现。

As a beginner, I did a very basic implementation of dropDownlist using the NorthWind Database only.

我已经导入的产品和放大器;供应商表从Northwind数据库。

I had imported the Product & Suppliers table from Northwind database.

在 ProductController.cs 文件，这是对我的产品表控制器文件，添加方法： GetAllSuppliers 来得到所有SuppliersID，我们将在下拉列表显示。

In the ProductController.cs file, which is the controller file for my Product table, add method: GetAllSuppliers to get all SuppliersID which we will display in a dropdown.

public IEnumerable<int> GetAllSuppliers()
        {
            NorthwindEntities db = new NorthwindEntities();
            return db.Suppliers.Select(e => e.SupplierID);
        } 

现在，在创建 ProductController.cs 操作方法，通过<$ C $的所有值C>供应商ID 在的ViewData ，如下图所示：

Now, in the Create action method in ProductController.cs, pass all the values of SupplierID in ViewData as seen below:

 public ActionResult Create()
            {

                ViewData["Suppliers"] = new SelectList(GetAllSuppliers());
                return View(new Product());
            } 

在您相应的 Create.aspx查看，使用：

<%: Html.DropDownListFor(model => model.SupplierID, ViewData["Suppliers"] as SelectList) %>

下面是结果的快照：

Below is a snapshot of the Result:

让我知道如果你需要任何解释。

Let me know if you need any explanation.

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