选择DropDownList的默认值使用ViewBag作为SelectList [英] Select default value for DropDownListFor using ViewBag as SelectList

问题描述

在我的控制器中，我有一个存储在ViewBag中的代理列表

In my controller I have a list of Agents stored in ViewBag

ViewBag.Agents = new SelectList(db.Users.ToList(), "Id", "UserName", string.Empty);

在我的视图中，我已将其显示为DropDownListFor

In my View I have display this as a DropDownListFor

 @Html.DropDownListFor(model => a.AgentList, ViewBag.Agents as SelectList, new { @class = "form -control", @style = "width:130px; height:30px" })

但是，我的列表没有将已选择的代理"显示为默认".我想念什么?如何设置下拉列表以将选定的座席显示为默认值?

However, my list is not showing the already selected Agent as Default. What am I missing? How can I set the Dropdownlist to display selected Agent as default?

我什至尝试过，但是没有用:

I even tried this but nothing work:

 @Html.DropDownListFor(model => a.AgentList, new SelectList( ViewBag.Agents as SelectList, a.AgentName), new { @class = "form -control", @style = "width:130px; height:30px" })

这是我的模特

[Display(Name = "Agent ID")]
public string AgentID { get; set; }
[Display(Name = "Agent Name")]
public string AgentName { get; set; }
[Display(Name = "Agent")]
public List<ApplicationUser> AgentList { get; set; }

感谢您的帮助

推荐答案

请使用以下步骤绑定 DropDownListFor 中的选定值.

Please use the below step for bind the selected value in DropDownListFor.

步骤:-1 ViewBag.Agents= db.Users.ToList();

步骤:-2 @Html.DropDownListFor(model => Model.AgentID, new SelectList(ViewBag.Agents, "Id", "UserName",2))

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