C# DropDownList用于不设置选定值
下面是我在MVC4.0中创建drownlist的代码。此外,我正在尝试设置一个选定的值C# DropDownList用于不设置选定值,c#,asp.net-mvc,asp.net-mvc-4,html-helper,html.dropdownlistfor,C#,Asp.net Mvc,Asp.net Mvc 4,Html Helper,Html.dropdownlistfor,下面是我在MVC4.0中创建drownlist的代码。此外,我正在尝试设置一个选定的值 Dictionary<String,String> states = Model.State; var statesList = new SelectList(states, "Value", "Key", Model.SelectedState.ToUpper()); @Html.DropDownListFor(l => l.State, statesList, new { @id = "
Dictionary<String,String> states = Model.State;
var statesList = new SelectList(states, "Value", "Key", Model.SelectedState.ToUpper());
@Html.DropDownListFor(l => l.State, statesList, new { @id = "ddlStates" })
我可以看到我的状态列表
中有一个选中的值,但下拉列表从不选择选中的值
Dictionary<String,String> states = Model.State;
var statesList = new SelectList(states, "Value", "Key", Model.SelectedState.ToUpper());
@Html.DropDownListFor(l => l.State, statesList, new { @id = "ddlStates" })
Dictionary states=Model.State;
var statesList=new SelectList(states,“Value”,“Key”,Model.SelectedState.ToUpper());
@DropDownListFor(l=>l.State,statesList,new{@id=“ddlStates”})
我的模型如下所示
public class ConsumerModel
{
public Dictionary<string, string> State { get; set; }
public String SelectedState { get; set; }
}
公共类ConsumerModel
{
公共字典状态{get;set;}
公共字符串SelectedState{get;set;}
}
的下拉列表根据模型设置所选值。因为您正在视图上设置列表,所以不需要state字段。将您的下拉列表更改为
@Html.DropDownListFor(l => l.SelectedState, statesList)
不能重写for帮助器上的id字段。并在控制器上设置SelectedState,它将在视图上设置。我认为您需要:
@Html.DropDownListFor(l => l.SelectedState, statesList, new { @id = "ddlStates" })
第一个参数应该是保存模型中的值的属性。名单上没有。这就是传递给第二个参数的内容