asp.net-mvc 使用 MVC 4 和实体框架填充 DropDownList
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Populate DropDownList using MVC 4 & Entity Framework
提问by TechGuy
I'm developing MVC4 & Entity Framework Application.I wanted to populate DropDownList,I wanted to bind Category List to Dodropdown list
我正在开发 MVC4 和实体框架应用程序。我想填充 DropDownList，我想将类别列表绑定到 Dodropdown 列表
IRepository Code
IRepository 代码
IList<Category> GetCategory();
Repository
存储库
public IList<Category> GetCategory()
{
return (from c in context.Categories
select c).ToList();
}
Controller
控制器
public IList<Category> GetCategory()
{
return icategoryRepository.GetCategory();
}
After that I stucked here.How do i bind data to Dropdownlist ?
之后我被困在这里。如何将数据绑定到 Dropdownlist ？
My View Code here
我的查看代码在这里
<label for="ProductType">Product Type</label>
@Html.DropDownListFor(m => m.ProductType,new List<SelectListItem>)
My Controller Code
我的控制器代码
public ActionResult AddProduct()
{
return View();
}
采纳答案by Morten Anderson
How about using ViewBag?
使用 ViewBag 怎么样？
View
看法
<label for="ProductType">Product Type</label>
@Html.DropDownListFor(m => m.ProductType,ViewBag.ListOfCategories)
Controller
控制器
public ActionResult AddProduct()
{
ViewBag.ListOfCategories = GetCategory();
return View();
}
回答by rochasdv
You could do this:
你可以这样做：
@Html.DropDownListFor(x => x.IdCategory, ViewBag.Categories)
But I would recommend you to avoid ViewBag/ViewData and profit from your viewmodel:
但我建议您避免使用 ViewBag/ViewData 并从您的视图模型中获利：
public ActionResult AddProduct()
{
var model = new TestModel();
//This is just a example, but I advise you to turn your IList in a SelectListItem, for view is more easy to work. Your List Categories will be like this hardcoded:
model.ListCategories= new SelectList(new[]
{
new { Value = "1", Text = "Category 1" },
new { Value = "2", Text = "Category 2" },
new { Value = "3", Text = "Category 3" },
}, "Value", "Text");
return View(model);
}
}
and in the view:
并在视图中：
@Html.DropDownListFor(x => x.IdCategory, Model.ListCategories)
I hope I have helped
我希望我有所帮助
回答by Jerad Rose
Using the ViewBag(as some have suggested in other answers/comments) to get data from your controller to view is generally seen as a code smell.
使用ViewBag（正如某些人在其他答案/评论中所建议的那样）从控制器获取数据以查看通常被视为代码异味。
Your ViewModelshould ideally contain all of the data you need for your view. So use your controller to populate this data on a property of your ViewModel:
ViewModel理想情况下，您应该包含视图所需的所有数据。因此，使用您的控制器在 ViewModel 的属性上填充此数据：
SelectList ProductTypes { get; set; }
Then bind your dropdown to this value
然后将您的下拉列表绑定到此值
@Html.DropDownListFor(m => m.ProductType, Model.ProductTypes)
You can find this same answer given on this post.
您可以在这篇文章中找到相同的答案。
回答by Saif
Very simple Code step by step 1) In Entity Framework Class
非常简单的代码一步一步 1) 在实体框架类中
var productsList = (from product in dbContext.Products
select new ProductDTO
{
ProductId = product.ProductId,
ProductName = product.ProductName,
}).ToList();
2) In Controller
2) 在控制器中
ViewBag.productsList = new EntityFrameWorkClass().GetBusinessSubCategoriesListForDD();
3) In View
3) 在视图中
@Html.DropDownList("Product_ProductId", new SelectList(ViewBag.productsList , "ProductId", "ProductName"), new { @class = "form-control" })
OR
或者
@Html.DropDownListFor(m=>m.Product_ProductId, new SelectList(ViewBag.productsList , "ProductId", "ProductName"), new { @class = "form-control" })
