在DropDownList中的MVC3设置默认选定值 [英] Setting a default selected value in DropDownList in MVC3
问题描述
在MVC3我有我的控制器此code。它检索的ID \\名称从安装表列表,并创建一个ViewBag
In MVC3 I have this code at my controller. It retrieves a List of IDs\Names from Installation table and creates a ViewBag
var vs = dba.Installation.OrderBy(q => q.InstName).ToList();
ViewBag.Vessels = new SelectList(vs, "InstId", "InstName");
现在,在我的看法。我想呈现一个下拉列表清单。我使用的HTML帮助工作正常...
Now, at my view. I want to render the list in a dropdown list. I used the Html helper that works fine...
@Html.DropDownList("InstId",(SelectList)ViewBag.Vessels, "- Select one -")
我需要设置第一个项目在ViewBag列表作为默认选择的值,而不是 - 请选择 - 文本。
I need to set first item in the ViewBag List as a default selected value, instead of "- Select one -" text.
我该怎么办呢?
在此先感谢!
推荐答案
有对的SelectList
构造函数4个参数的重载。其中最后是默认选择的对象。例如:
There's an overload for the SelectList
constructor that takes 4 arguments. The last of which is the default selected object. E.g:
ViewBag.Vessels = new SelectList(vs, "InstId", "InstName", selectedValue);
其中,了selectedValue
是什么类型列表中的一个对象。
Where selectedValue
is an object of whatever type is in your list.
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