如何编写简单的Html.DropDownListFor()？

Question

在ASP.NET MVC 2中,我想写一个非常简单的下拉列表,它给出了静态选项.例如,我想提供"红色","蓝色"和"绿色"之间的选择.

Answer 1

请参阅此MSDN文章以及Stack Overflow上的示例用法.

假设您有以下Linq/POCO课程:

public class Color
{
    public int ColorId { get; set; }
    public string Name { get; set; }
}

让我们说你有以下模型:

public class PageModel 
{
   public int MyColorId { get; set; }
}

最后,让我们说你有以下颜色列表.它们可以来自Linq查询,来自静态列表等:

public static IEnumerable<Color> Colors = new List<Color> { 
    new Color {
        ColorId = 1,
        Name = "Red"
    },
    new Color {
        ColorId = 2,
        Name = "Blue"
    }
};

在您的视图中,您可以创建一个下拉列表,如下所示:

<%= Html.DropDownListFor(n => n.MyColorId, 
                         new SelectList(Colors, "ColorId", "Name")) %>

Answer 2

<%: 
     Html.DropDownListFor(
           model => model.Color, 
           new SelectList(
                  new List<Object>{ 
                       new { value = 0 , text = "Red"  },
                       new { value = 1 , text = "Blue" },
                       new { value = 2 , text = "Green"}
                    },
                  "value",
                  "text",
                   Model.Color
           )
        )
%>

或者你不能写任何类,把这样的东西直接放到视图中.

Answer 3

从模型中的词典开始,避免大量的指法

namespace EzPL8.Models
{
    public class MyEggs
    {
        public Dictionary<int, string> Egg { get; set; }

        public MyEggs()
        {
            Egg = new Dictionary<int, string>()
            {
                { 0, "No Preference"},
                { 1, "I hate eggs"},
                { 2, "Over Easy"},
                { 3, "Sunny Side Up"},
                { 4, "Scrambled"},
                { 5, "Hard Boiled"},
                { 6, "Eggs Benedict"}
            };

    }


    }

在视图中将其转换为列表以供显示

@Html.DropDownListFor(m => m.Egg.Keys,
                         new SelectList(
                             Model.Egg, 
                             "Key", 
                             "Value"))

Answer 4

您好,我是如何在一个项目中做到的:

     @Html.DropDownListFor(model => model.MyOption,                
                  new List<SelectListItem> { 
                       new SelectListItem { Value = "0" , Text = "Option A" },
                       new SelectListItem { Value = "1" , Text = "Option B" },
                       new SelectListItem { Value = "2" , Text = "Option C" }
                    },
                  new { @class="myselect"})

我希望它可以帮助某人.谢谢

Answer 5

或者,如果它来自数据库上下文,您可以使用

@Html.DropDownListFor(model => model.MyOption, db.MyOptions.Select(x => new SelectListItem { Text = x.Name, Value = x.Id.ToString() }))

Answer 6

带有“请选择一项”

@Html.DropDownListFor(model => model.ContentManagement_Send_Section,
  new List<SelectListItem> { new SelectListItem { Value = "0", Text = "Plese Select one Item" } }
    .Concat(db.NameOfPaperSections.Select(x => new SelectListItem { Text = x.NameOfPaperSection, Value = x.PaperSectionID.ToString() })),
  new { @class = "myselect" })  

从代码派生而来：Master Programmer && Joel Wahlund ;
国王参考：https: //stackoverflow.com/a/1528193/1395101 JaredPar ;

谢谢首席程序员 && Joel Wahlund && JaredPar ;

祝你好运的朋友。