当我使用所选的项目不显示DropDownListFor [英] The selected item does not display when I use DropDownListFor

问题描述

我用下面生成一个下拉列表：

I am using the following to generate a drop down list:

@for (var index = 0; index < Model.AdminSummaries.Count(); index++) 
            { 
            <div class="rep_tr0"> 
                <div class="rep_td0"> 
                    @Html.DropDownListFor(x => Model.AdminSummaries[index].Status, 
                       AdminStatusReference.GetAdminStatusOptions(),
                       new { id = string.Format("Status_{0}",index ) })
                 </div> 
            </div>
            }

下面是它生成的HTML：

Here's the HTML it generates:

<select id="Status_1" name="AdminSummaries[1].Status"><option value="1">Released</option>
<option value="2">Review</option>
<option value="3">New</option>
</select>

下面是给出了状态选项的类。

Here's the class that gives the status options.

public static class AdminStatusReference
{

    public static IEnumerable<SelectListItem> GetAdminStatusOptions()
    {
        return new[]
            {
                new SelectListItem { Value = "1", Text = "Released"  },
                new SelectListItem { Value = "2", Text = "Review" },
                new SelectListItem { Value = "3", Text = "New" }
            };
    }

}

一切工作不错，除了它不能正确地选择项目。有与'选择'没有选择在AdminSummaries匹配的数据。

Everything works good EXCEPT it doesn't select the items correctly. There's no option with 'selected' to match the data in the AdminSummaries.

怎样才能使它所以都选择了正确的选择列表项？

How can I make it so the correct select list items are selected?

只是为了澄清这一点。我的问题是，如果有与状态的值为3的数据记录，然后，当我看屏幕我看到一个选择列表用释放出。

Just to clarify this. My problem is that if there is a data record with a value of 3 for the status then when I look at the screen I see a select list with the word "Release" showing.

我需要的是选择列表以显示与数据值对应的文本。

What I need is for the select list to show text that corresponds with the data value.

推荐答案

下面是更准确的答案

public static class AdminStatusReference 
{ 
    public static IEnumerable<SelectListItem> GetAdminStatusOptionsFor(AdminSummaries arg) 
    { 
        var options = new[] 
            { 
                new SelectListItem { Value = "1", Text = "Released" }, 
                new SelectListItem { Value = "2", Text = "Review" }, 
                new SelectListItem { Value = "3", Text = "New" } 
            }; 
        options.First(o=> o.Value == arg).Selected = true;
        return options; 
    } 
} 

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