[英]Dropdownlist Selected value does not work
I want to edit a record in my application, I go to edit page but I don't know why my dropdownlists don't show selected values that when I selected in create page. 我想在应用程序中编辑记录,我转到编辑页面,但是我不知道为什么我的下拉列表不显示在创建页面中选择的所选值。 this is my codes :
这是我的代码:
My controller : 我的控制器:
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
book book = db.books.Find(id);
if (book == null)
{
return HttpNotFound();
}
ViewBag.books = new SelectList(db.books, "id", "name", book.value);
return View(book);
}
and my action : 和我的行动:
@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
@Html.DropDownList("value", (IEnumerable<SelectListItem>)ViewBag.books , "Choose.")
}
What is problem? 怎么了 In trance I can see that one on options is selectedvalue, but dropdownlist does not show selected value.
在发呆中,我可以看到一个on选项是selectedvalue,但是dropdownlist不显示所选值。 why?
为什么?
change 更改
ViewBag.books = new SelectList(db.books, "id", "name", books.value);
into 成
ViewBag.books = new SelectList(db.books, "id", "name", book.id);
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