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[英]Html.dropdownlist does not display the default/selected value in the dropdown field
[英]Html.DropDownList doesn't display SelectList selected value
我已經閱讀了許多有關該主題的問題,但沒有設法找到解決此特定問題的方法。
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" })
調試視圖時,我可以清楚地看到會話中存儲的期權已發送到視圖。 但是在瀏覽器中簽入時顯示索引0。 這讓我感到困惑,因為SelectList的行為正常,我認為問題出在DropDown上,但是可能是什么問題呢?
您可以嘗試更改Viewbag屬性名稱並重試嗎?
嘗試類別=> 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" })
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