将列表绑定到MVC中的Dropdown [英] Bind list into Dropdown in MVC

问题描述

我的控制器代码：

my controller code:

var clentddl= db.ClientDetails.Where(x=>x.IsActive==true).Select(x=>x.Name).ToList();
           ViewBag.Clientname = clentddl.ToList();

           return View();

我的观点是：

my view is:

@Html.DropDownListFor(x => x.Clientname , ViewBag.Clientname as List<SelectListItem>, "PleaseSelect", new { @class = "form-control" })

问题：



i将数据放入列表并收集在viewbag中。如何在视图中绑定？

Problem:

i got the data into the list and collected in viewbag. how to bind in view??

推荐答案

使用下面的代码：



@ Html.DropDownListFor（model => model.ClientId，new SelectList（ViewBag.Clientname as System.Collections.IEnumerable，ClientId，RoleName），new {id =ddlClientName}）

Use below code:

@Html.DropDownListFor(model => model.ClientId, new SelectList(ViewBag.Clientname as System.Collections.IEnumerable, "ClientId","RoleName"), new { id = "ddlClientName" })

1 。在ASP.NET MVC中，必须在视图中使用的所有数据都应作为已使用的模型中的属性存在。因此，在您的情况下，您必须扩展您的模型类，并在其中添加一个将用于此下拉列表的属性，然后您可以使用 @ Html.DropDownListFor（）在视图中使用它并且不使用缓存到ViewBag中的数据。



2.要修复现有代码，必须在View <$ c中缓存$ c> 包含列表< SelectListItem> 的列表，而不是像现在这样的简单列表，所以在你的控制器中你必须建立此列表之前将其缓存到视图包中。

1.In ASP.NET MVC, all data that have to be used in the view should exist as properties in the used model. So in your case you have to extends your model class and and into it a property that will be used for this drop down list, then you will can use it in the view by using @Html.DropDownListFor() and not to use data cached into the ViewBag.

2.To fix your existing code you have to cache in the ViewBag a list of List<SelectListItem> and not a simple list like you are doing now, so in you controller you have to built this list before to cache it into the view bag.

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