MVC DropDownList的选定值不工作 [英] MVC DropDownList selected value not working

问题描述

我使用MVC 5。

我有我的名单ViewBag为

I have my ViewBag for list as

ViewBag.TitleList = new SelectList((new string[] { "Mr", "Miss", "Ms", "Mrs" }), contact.Title);
//contact.Title has selected value.

然后我尝试了数组 SelectListItem转换（无济于事）

在View它看起来像

@Html.DropDownListFor(model => model.Title, ViewBag.TitleList as SelectList, "Select")

也是我试过

@Html.DropDownList("Title", ViewBag.TitleList as SelectList, "Select")

该列表加载成功，但选定值未选择。
如何解决这个问题呢？

The list loads successfully but the Selected Value is Not selected. How to Fix this problem?

更新
罪魁祸首是ViewBag.Title匹配我的model.Title。我改名模型属性到别的和它的工作。 Arrgh！

Update The culprit was ViewBag.Title matching my model.Title. Renamed my model property to something else and it worked. Arrgh!

推荐答案

在控制器中的标题属性的设定值：

Set value of the Title property in the controller:

ViewBag.TitleList = new SelectList(new string[] { "Mr", "Miss", "Ms", "Mrs" });
viewModel.Title = "Miss"; // Miss will be selected by default

另一个可能的原因（和正确的基础上，下面的评论）是计算机[标题] 被另一个值覆盖。更改标题属性的名称任何其他一切都应该工作。

Another possible reason (and the correct one, based on the comments below) is that ViewData["Title"] is overridden by another value. Change name of the Title property to any other and everything should work.

这篇关于MVC DropDownList的选定值不工作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！