Question

基于此代码（自动生成的Visual Studio中的控件/视图代码）：

<div class="form-group">
    @Html.LabelFor(model => model.Type, htmlAttributes: new { @class = "control-label col-md-2" })
    <div class="col-md-10">
        @*Comment: Want to replace EditorFor to DropDownList("Banana, "Apple", "Orange"*@
        @Html.EditorFor(model => model.Type, new { htmlAttributes = new { @class = "form-control" } })*@
        @Html.ValidationMessageFor(model => model.Type, "", new { @class = "text-danger" })
    </div>
</div>

我想添加类似的东西：

@Html.DropDownList("UserId", null, htmlAttributes: new { @class = "form-control" })

（也是自动生成的代码，但适用于UserId）而不是@html.EditorFor...

我能够通过Controller从db看到UserName（值= Id）的列表：

ViewBag.UserId = new SelectList(db.Users, "Id", "UserName", Test.UserId);

现在，我不希望ViewBag从数据库中读取，而是希望它列出3个不同的字符串，我将使用它来让用户选择indata（意思是，限制它们选择这3个字符串中的一个而不是写它）。

字符串我希望它列出：

“香蕉”
“苹果”
“橙色”

我该怎么做？

Answer 1

试试这个，

@Html.DropDownListFor(x => x.Id, new List<SelectListItem>
                                 { new SelectListItem { Text = "Banana", Value = "1", Selected=true},
                                   new SelectListItem { Text = "Apple", Value = "2"},
                                   new SelectListItem { Text = "Orange", Value = "3"}
                                   }, "Select Fruit")

OR

获取模型中的价值

*(list+sizeof(int)) = 0;

Answer 2

只需将您分配的内容更改为ViewBag.UserId f.e.像这样：

var fruits = new List<string> { "Banana", "Apple", "Orange" };
ViewBag.Fruits = fruits.Select(f => new SelectListItem { Text = f, Value = f });

Answer 3

这是您构建列表项的方法：

ViewBag.Fruits = new SelectList(
    new List<SelectListItem>
    {
        new SelectListItem { Selected = true, Text = string.Empty, Value = "-1"},
        new SelectListItem { Selected = false, Text = "Banana", Value = 0},
        new SelectListItem { Selected = false, Text = "Apple", Value = 1},
    }, "Value" , "Text", 1);

Answer 4

以下是使用枚举

执行此操作的另一种方法

public enum Fruit { Banana, Apple, Orange }

@Html.DropDownList("FruitSelection", 
                    new SelectList(Enum.GetValues(typeof(Fruit))),
                    "Select Fruit",
                    new { @class = "form-control" })

Answer 5

MVC 控制器

private void extarct (){
                            CPIOFileStream sr = new CPIOFileStream( "source file" );
                            sr.Extract( "Distnationfolder" );
                       }

在视图中

  ViewBag.PageSort = new List <SelectListItem> ()
         {
             new SelectListItem () {Value = "1", Text = "Discounts"},
             new SelectListItem () {Value = "2", Text = "New Items"},
             new SelectListItem () {Value = "3", Text = "Lowest Price"},
             new SelectListItem () {Value = "4", Text = "Highest Price"}
         };

MVC - 显示DropDownList中的字符串列表

5 个答案: