如何将项添加到ASP.net MVC中的SelectList

基本上我想在SelectList的开头插入一个项目,默认值为0,文本值为" - 选择一个 - "

就像是

SelectList list = new SelectList(repository.func.ToList());
ListItem li = new ListItem(value, value);
list.items.add(li);

可以这样做吗？

除非你坚持使用值0,否则确实没有必要这样做.HtmlHelper DropDownList扩展允许你设置一个选项标签,它在select值中显示为初始值,带有空值.只需使用具有选项标签的DropDownList签名之一.

<%= Html.DropDownList( "DropDownValue",
                       (IEnumerable)ViewData["Menu"],
                        "-- Select One --" ) %>

我通过填充SelectListItem,转换为List,并在索引0处添加值来实现此功能.

List items = new SelectList(CurrentViewSetups, "SetupId", "SetupName", setupid).ToList(); 
items.Insert(0, (new SelectListItem { Text = "[None]", Value = "0" }));
ViewData["SetupsSelectList"] = items;

这个有可能.

//Create the select list item you want to add
SelectListItem selListItem = new SelectListItem() { Value = "null", Text = "Select One" };

//Create a list of select list items - this will be returned as your select list
List newList = new List();

//Add select list item to list of selectlistitems
newList.Add(selListItem);

//Return the list of selectlistitems as a selectlist
return new SelectList(newList, "Value", "Text", null);

我喜欢@AshOoO的答案,但像@Rajan Rawal我需要保留所选的项目状态,如果有的话.所以我将自定义添加到他的方法中AddFirstItem()

public static SelectList AddFirstItem(SelectList origList, SelectListItem firstItem)
{
    List newList = origList.ToList();
    newList.Insert(0, firstItem);

    var selectedItem = newList.FirstOrDefault(item => item.Selected);
    var selectedItemValue = String.Empty;
    if (selectedItem != null)
    {
        selectedItemValue = selectedItem.Value;
    }

    return new SelectList(newList, "Value", "Text", selectedItemValue);
}

这里的HTML帮手为您

public static SelectList IndividualNamesOrAll(this SelectList Object)
{
    MedicalVarianceViewsDataContext LinqCtx = new MedicalVarianceViewsDataContext();

    //not correct need individual view!
    var IndividualsListBoxRaw =  ( from x in LinqCtx.ViewIndividualsNames 
                                 orderby x.FullName
                                 select x);

    List items = new SelectList (
                               IndividualsListBoxRaw, 
                              "First_Hospital_Case_Nbr", 
                              "FullName"
                               ).ToList();

    items.Insert(0, (new SelectListItem { Text = "All Individuals", 
                                        Value = "0.0", 
                                        Selected = true }));

    Object = new SelectList (items,"Value","Text");

    return Object;
}