ViewBag.CategoryId = new SelectList(db.Categories, "Id", "Name","默认值");
<div
class="editor-label">
@Html.LabelFor(model => model.CategoryId,
"Category")
</div>
<div
class="editor-field">
@Html.DropDownList("CategoryId",
String.Empty)
@Html.ValidationMessageFor(model =>
model.CategoryId)
</div>