将dropdownListfor分配给值为0的"全部"选项

Question

我在我的视图中有一个dropdownList,我想为其分配一个值为0的All选项

<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,其选中的值应为0全部..我试过的是不行的.

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; }
}

视图

@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" })

调节器

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List<SelectListItem>在控制器中构造并添加一个SelectListItem包含所需文本和值的文件.将您的财产更改为

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

并在控制器中

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;

然后在视图中

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

(同上Team)