asp.net-mvc - 将 dropdownListfor 分配给 value=0 的 "All"选项

Question

我的 View 中有一个 dropdownList，我想为其分配值为 0 的 All 选项假设

<option value="0">All</option>
<option value="1">Account A</option>
<option value="2">Account B</option>

依此类推，如果用户默认情况下不选择任何一个选项，则其选择的值应为 0 All..我尝试过的方法不起作用。

这是我的代码，任何帮助将不胜感激。

public class ReportViewModel
    {
        public SelectList Account { get; set; }
        public string SelectedAccount { get; set; }

        public SelectList User { get; set; }
        public string SelectedUser { get; set; }
public SelectList Team { get; set; }
        public string SelectedTeam { get; set; }
}

查看

@Html.DropDownListFor(m => m.SelectedAccount, (IEnumerable<SelectListItem>)Model.Account, " ALL ", new { @class = "form-control" })

 @Html.DropDownListFor(m => m.SelectedTeam, (IEnumerable<SelectListItem>)Model.Team, " ALL ", new { @class = "form-control" })

Controller

reportViewModel.Account = new SelectList(preFlightDbContext.Accounts.Where(o => o.AccountId != 0 && o.Deleted == false), "AccountId", "AccountName");
reportViewModel.Team = new SelectList(preFlightDbContext.Teams.Where(o => o.TeamId != 0 && o.Deleted == false), "TeamId", "TeamName");

Answer 1

您需要构建List<SelectListItem>在 Controller 中添加 SelectListItem与您想要的文本和值。将您的属性更改为

public IEnumerable<SelectListItem> Account { get; set; }

在 Controller 中

List<SelectListItem> accounts = preFlightDbContext.Accounts
    .Where(o => o.AccountId != 0 && o.Deleted == false)
    .Select(o => new SelectListItem()
    {
      Value = AccountId.ToString(), // assumes AccountId is not a string
      Text = AccountName
    }).ToList();
accounts.Insert(0, new SelectListItem() { Value = "0", Text = "All" });
reportViewModel.Account = accounts;

然后在 View 中

@Html.DropDownListFor(m => m.SelectedAccount, Model.Account, new { @class = "form-control" })

(Team 同上)