Question

下面是我在视图中的DropDownList

<div class="col-xs-8 col-sm-8 col-md-4">                           
 @Html.DropDownList("Status",new List<SelectListItem> { new SelectListItem{ Text="Active", Value = "Active" },new SelectListItem{ Text="InActive", Value = "InActive" }}, new { @class = "form-control" })
</div>

从DB值到“活动”或“非活动”，下拉列表已经是这两个值。从我的数据库中我在ViewBag.IsStatus中分配值。现在假设我的值是来自DB的“InAactive”，然后如何在Dropdown中将其指定为Selected值，而不是默认情况下将First下拉显示为选中。

Answer 1

如果使用MVC，最好使用DropDownListFor。但是对于您的情况，只需创建SelectList并将其传递给DropDownList。 SelectList contructor对所选值具有重载：

@{ //theese lines actually should be in controller.
 var list = new List<SelectListItem> 
             { 
             new SelectListItem 
                   { 
                       Text="Active", 
                       Value = "0" 
                   }
             ,new SelectListItem
                   { 
                       Text="InActive", 
                       Value = "1" 
                    }
             }
}

//thats your code
<div class="col-xs-8 col-sm-8 col-md-4">                           
   @Html.DropDownList("Status",new SelectList(list, "Value", "Text", ViewBag.IsStatus), new { @class = "form-control" })
</div>

Answer 2

如果您的模型具有Status属性，则只需将该值赋给该属性（例如在控制器中）：

模型

public class Model
{

    public string Status {get;set;}
}

控制器

public ActionResult SomeAction()
{
    //the value has to correspond to the Value property of SelectListItems
    //that you use when you create dropdown
    //so if you have new SelectListItem{ Text="Active", Value = "Active" }
    //then the value of Status property should be 'Active' and not a 0
    var model = new Model{Status = "Active"}

    return this.View(model);
}

查看：

@model Model


@Html.DropDownListFor(m=>m.Status,new List<SelectListItem> { new SelectListItem{ Text="Active", Value = "Active" },new SelectListItem{ Text="InActive", Value = "InActive" }}, new { @class = "form-control" })

如何在MVC的DropDownList中显示所选值

2 个答案: