如何使用ViewBag创建下拉列表? [英] How to use a ViewBag to create a dropdownlist?

问题描述

控制器:

public ActionResult Filter()
{
    ViewBag.Accounts = BusinessLayer.AccountManager.Instance.getUserAccounts(HttpContext.User.Identity.Name);
    return View();
}

查看:

<td>Account: </td>
<td>@Html.DropDownListFor("accountid", new SelectList(ViewBag.Accounts, "AccountID", "AccountName"))</td>

ViewBag.Accounts包含具有AccountID，AccountName和其他属性的Account对象. 我想要一个名为 accountid 的DropDownList(这样在Form Post上我可以传递所选的AccountID)和DropDownList来显示AccountName，同时将AccountID作为值.

ViewBag.Accounts contains Account objects which have AccountID, AccountName and other properties. I would like a DropDownList called accountid (so that on Form Post I can pass the selected AccountID) and the DropDownList to display the AccountName while having the AccountID as value.

我在查看代码中做错了什么?

What am I doing wrong in the view code?

推荐答案

您不能使用Helper @Html.DropdownListFor，因为第一个参数不正确，请将您的Helper更改为:

You cannot used the Helper @Html.DropdownListFor, because the first parameter was not correct, change your helper to:

@Html.DropDownList("accountid", new SelectList(ViewBag.Accounts, "AccountID", "AccountName"))

@Html.DropDownListFor在所有重载中的第一个参数中都接收一个lambda表达式，并用于创建强类型的下拉列表.

@Html.DropDownListFor receive in the first parameters a lambda expression in all overloads and is used to create strongly typed dropdowns.

如果您的View的类型是强类型的，则可以使用帮助程序来更改代码，以创建强类型的下拉列表，例如

If your View it's strongly typed to some Model you may change your code using a helper to created a strongly typed dropdownlist, something like

@Html.DropDownListFor(x => x.accountId, new SelectList(ViewBag.Accounts, "AccountID", "AccountName"))

这篇关于如何使用ViewBag创建下拉列表?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！