如何将枚举的值放入SelectList中?-HowtogetthevaluesofanenumintoaSelectList

22  

To get the value of an enum you need to cast the enum to its underlying type:

要获得enum的值，您需要将enum转换为其底层类型:

Value = ((int)i).ToString();

76  

It's been awhile since I've had to do this, but I think this should work.

我已经有一段时间没这么做了，但我认为这应该行得通。

var directiOns= from Direction d in Enum.GetValues(typeof(Direction))
           select new { ID = (int)d, Name = d.ToString() };
return new SelectList(directions , "ID", "Name", someSelectedValue);

35  

There is a new feature in ASP.NET MVC 5.1 for this.

ASP有一个新特性。NET MVC 5.1就是这样。

http://www.asp.net/mvc/overview/releases/mvc51-release-notes#Enum

http://www.asp.net/mvc/overview/releases/mvc51-release-notes枚举

@Html.EnumDropDownListFor(model => model.Direction)

29  

This is what I have just made and personally I think its sexy:

这就是我刚刚做的，我个人认为它很性感:

 public static IEnumerable GetEnumSelectList()
        {
            return (Enum.GetValues(typeof(T)).Cast().Select(
                enu => new SelectListItem() { Text = enu.ToString(), Value = enu.ToString() })).ToList();
        }

I am going to do some translation stuff eventually so the Value = enu.ToString() will do a call out to something somewhere.

我将最终做一些转换工作，因此Value = enu.ToString()将在某处调用一些东西。

16  

I wanted to do something very similar to Dann's solution, but I needed the Value to be an int and the text to be the string representation of the Enum. This is what I came up with:

我想做一些与Dann解决方案非常相似的事情，但是我需要值是int，文本是Enum的字符串表示。这就是我想到的:

public static IEnumerable GetEnumSelectList()
    {
        return (Enum.GetValues(typeof(T)).Cast().Select(e => new SelectListItem() { Text = Enum.GetName(typeof(T), e), Value = e.ToString() })).ToList();
    }

4  

Or:

或者:

foreach (string item in Enum.GetNames(typeof(MyEnum)))
{
    myDropDownList.Items.Add(new ListItem(item, ((int)((MyEnum)Enum.Parse(typeof(MyEnum), item))).ToString()));
}

4  

return
            Enum
            .GetNames(typeof(ReceptionNumberType))
            .Where(i => (ReceptionNumberType)(Enum.Parse(typeof(ReceptionNumberType), i.ToString()))  new
            {
                description = i,
                value = (Enum.Parse(typeof(ReceptionNumberType), i.ToString()))
            });

3  

maybe not an exact answer to the question, but in CRUD scenarios i usually implements something like this:

也许这个问题没有一个确切的答案，但在CRUD场景中，我通常会实现如下的东西:

private void PopulateViewdata4Selectlists(ImportJob job)
{
   ViewData["Fetcher"] = from ImportFetcher d in Enum.GetValues(typeof(ImportFetcher))
                              select new SelectListItem
                              {
                                  Value = ((int)d).ToString(),
                                  Text = d.ToString(),
                                  Selected = job.Fetcher == d
                              };
}

PopulateViewdata4Selectlists is called before View("Create") and View("Edit"), then and in the View:

populateviewdata4selectlist在视图(“Create”)和视图(“Edit”)之前被调用，然后在视图中:

<%= Html.DropDownList("Fetcher") %>

and that's all..

这就是. .

3  

    public static SelectList ToSelectList(this TEnum enumObj) where TEnum : struct
    {
        if (!typeof(TEnum).IsEnum) throw new ArgumentException("An Enumeration type is required.", "enumObj");

        var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = (int)Enum.Parse(typeof(TEnum), e.ToString()), Name = e.ToString() };
        //var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = e, Name = e.ToString() };

        return new SelectList(values, "ID", "Name", enumObj);
    }
    public static SelectList ToSelectList(this TEnum enumObj, string selectedValue) where TEnum : struct
    {
        if (!typeof(TEnum).IsEnum) throw new ArgumentException("An Enumeration type is required.", "enumObj");

        var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = (int)Enum.Parse(typeof(TEnum), e.ToString()), Name = e.ToString() };
        //var values = from TEnum e in Enum.GetValues(typeof(TEnum)) select new { ID = e, Name = e.ToString() };
        if (string.IsNullOrWhiteSpace(selectedValue))
        {
            return new SelectList(values, "ID", "Name", enumObj);
        }
        else
        {
            return new SelectList(values, "ID", "Name", selectedValue);
        }
    }

3  

In ASP.NET Core MVC this is done with tag helpers.

在ASP。NET Core MVC这是通过标记助手完成的。

1  

I have more classes and methods for various reasons:

由于各种原因，我有更多的课程和方法:

Enum to collection of items

枚举到项目集合

public static class EnumHelper
{
    public static List EnumToCollection()
    {
        return (Enum.GetValues(typeof(T)).Cast().Select(
            e => new ItemViewModel
                     {
                         IntKey = e,
                         Value = Enum.GetName(typeof(T), e)
                     })).ToList();
    }
}

Creating selectlist in Controller

在控制器中创建selectlist

int selectedValue = 1; // resolved from anywhere
ViewBag.Currency = new SelectList(EnumHelper.EnumToCollection(), "Key", "Value", selectedValue);

MyView.cshtml

MyView.cshtml

@Html.DropDownListFor(x => x.Currency, null, htmlAttributes: new { @class = "form-control" })

0  

I had many enum Selectlists and, after much hunting and sifting, found that making a generic helper worked best for me. It returns the index or descriptor as the Selectlist value, and the Description as the Selectlist text:

我有许多enum选择列表，在进行了大量搜索和筛选之后，我发现让通用助手最适合我。它返回索引或描述符作为Selectlist值，描述作为Selectlist文本:

Enum:

枚举:

public enum Your_Enum
{
    [Description("Description 1")]
    item_one,
    [Description("Description 2")]
    item_two
}

Helper:

助手:

public static class Selectlists
{
    public static SelectList EnumSelectlist(bool indexed = false) where TEnum : struct
    {
        return new SelectList(Enum.GetValues(typeof(TEnum)).Cast().Select(item => new SelectListItem
        {
            Text = GetEnumDescription(item as Enum),
            Value = indexed ? Convert.ToInt32(item).ToString() : item.ToString()
        }).ToList(), "Value", "Text");
    }

    // NOTE: returns Descriptor if there is no Description
    private static string GetEnumDescription(Enum value)
    {
        FieldInfo fi = value.GetType().GetField(value.ToString());
        DescriptionAttribute[] attributes = (DescriptionAttribute[])fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
        if (attributes != null && attributes.Length > 0)
            return attributes[0].Description;
        else
            return value.ToString();
    }
}

Usage: Set parameter to 'true' for indices as value:

用法:将指标参数设置为“true”为值:

var descriptorsAsValue = Selectlists.EnumSelectlist();
var indicesAsValue = Selectlists.EnumSelectlist(true);