如何过滤枚举并在下拉列表中使用 [英] How to Filter Enum and Use it in Dropdown

问题描述

我是MVC 5的新手，我的目标是过滤要显示在下拉列表中的enum中的列表

I am new to MVC 5 and My goal is to filter the list in my enum that I will show in my dropdown list

public enum DayofWeekType
{
      Monday=1,
      Tuesday= 2,
      Wednesday=3,
      Thursday=4,
      Friday= 5,
      Saturday=6,
      Sunday= 7
}

当登录的用户不是管理员时，我只想显示周五，周六和周日的下拉列表，我找不到在Model中过滤enum字段的解决方案，尝试在模型中添加条件，但始终总结为错误.尝试搜索LINQ和jQuery解决方案.

And I just want to show is friday,saturday and sunday in dropdown when the logged user is Not Administrator, I cant find solution on filtering enum field in Model, tried adding Conditions in model but always sums up with errors. Tried searching for LINQ and jQuery solutions.

推荐答案

您可以这样做

   var enumlist =  Enum.GetValues(typeof(DayofWeekType)).Cast<DayofWeekType>().Select(v => new SelectListItem
    {
        Text = v.ToString(),
        Value = ((int)v).ToString()
    });

    if (IsUser) //your condition here
    {
      enumlist=  enumlist.Skip(4);

    }

    ViewBag.enumlist = enumlist;

在您看来

@Html.DropDownListFor(x=>x.Id,(IEnumerable<SelectListItem>) ViewBag.enumlist)

.Skip将跳过第一个4值，并以Friday值Friday

.Skip will skip first 4 values and start with 5th value which is Friday

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