![](/img/trans.png)
[英]Html.dropdownlist does not display the default/selected value in the dropdown field
[英]Html.DropDownList doesn't display SelectList selected value
我已经阅读了许多有关该主题的问题,但没有设法找到解决此特定问题的方法。
public ActionResult Index() {
string categorie = "--Tout--";
string souscategorie = "--Tout--";
if (Session["Categorie"] != null) {
categorie = Session["Categorie"].ToString();
}
if (Session["SousCategorie"] != null) {
souscategorie = Session["SousCategorie"].ToString();
}
SelectList cats = new SelectList(GetCategories(), categorie);
SelectList sCats = new SelectList(GetSousCategories(), souscategorie);
ViewBag.Categories = cats;
ViewBag.SousCategories = sCats;
using(DAL.WebShopEntities entities = new WebShopEntities()) {
return View(entities.Article.ToList());
}
}
@Html.Label("Catégories")
@Html.DropDownList("Categories", (SelectList)ViewBag.Categories, new { @class = "form-control dropdownlist" })
<br />
@Html.Label("Sous-Catégories")
@Html.DropDownList("SousCategories", (SelectList)ViewBag.SousCategories, new { @class = "form-control dropdownlist" })
调试视图时,我可以清楚地看到会话中存储的期权已发送到视图。 但是在浏览器中签入时显示索引0。 这让我感到困惑,因为SelectList的行为正常,我认为问题出在DropDown上,但是可能是什么问题呢?
您可以尝试更改Viewbag属性名称并重试吗?
尝试类别=> CategoriesList和SousCategories => SousCategoriesList
public ActionResult Index() {
string categorie = "--Tout--";
string souscategorie = "--Tout--";
if (Session["Categorie"] != null) {
categorie = Session["Categorie"].ToString();
}
if (Session["SousCategorie"] != null) {
souscategorie = Session["SousCategorie"].ToString();
}
SelectList cats = new SelectList(GetCategories(), categorie);
SelectList sCats = new SelectList(GetSousCategories(), souscategorie);
ViewBag.CategoriesList = cats;
ViewBag.SousCategoriesList = sCats;
using(DAL.WebShopEntities entities = new WebShopEntities()) {
return View(entities.Article.ToList());
}
}
@Html.Label("Catégories")
@Html.DropDownList("Categories", (SelectList)ViewBag.CategoriesList, new { @class = "form-control dropdownlist" })
<br />
@Html.Label("Sous-Catégories")
@Html.DropDownList("SousCategories", (SelectList)ViewBag.SousCategoriesList, new { @class = "form-control dropdownlist" })
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.