Question

在我的应用程序中，我已将UserId与我的数据库中的表相关联。我需要在创建新项目时，我可以从下拉列表中选择用户名。并且'可以使用元素viewbag执行此操作吗？

@Html.EditorFor(model => model.UserId)

我使用默认会员提供商，因此无法使用Entity Framework解决此问题

修改

编辑2

这是我的行动创建：

[HttpPost]
public ActionResult Create(Employe employe)
{
        var users = Roles.GetUsersInRole("Admin");
        SelectList list = new SelectList(users);
        ViewBag.Users = list;
        if (ModelState.IsValid)
        {
            **employe.EmployeID = users;**
            db.Employes.Add(employe);
            db.SaveChanges();
}

这不起作用。错误是：

无法将类型'string []'隐式转换为'string'

我的Employee

模型

public class Employee
{
        [Key]
        public int EmployeID { get; set; }

        public Guid UserId { get; set; }

        public string Name { get; set; }

        [ForeignKey("UserId")]
        public virtual MembershipUser User
        {
            get
            {
                return Membership.GetUser(this.Name); //Changed this to Name 
            }
        }

    }
}

查看：

@Html.DropDownList("Users", ViewBag.Users as SelectList);

UserId字段中的结果不是UserId，而是000000-000000-0000000-00000

Answer 1

如何在ViewBack中将用户列表设置为SelectItem 是的，您应该可以通过将您的集合传递给ViewBag，然后从中创建下拉列表来实现此目的：

在您的控制器中

        var users = Roles.GetUsersInRole("Admin");
        SelectList list = new SelectList(users);
        ViewBag.Users = list;

在您的视图中（如果您使用的是Razor）

@Html.DropDownList("Users", ViewBag.Users as SelectList);

在此处阅读有关SelectListItem的更多信息：

http://msdn.microsoft.com/en-us/library/system.web.mvc.selectlistitem.aspx

同时退房：

问题改为更多内容。我的想法是解决这个问题：

<强>控制器：

public ActionResult Mirko() {
    List<SelectListItem> items = new List<SelectListItem>();    
    foreach (string userName in Roles.GetUsersInRole("Admin")) {
        var user = Membership.GetUser(userName);
        SelectListItem li = new SelectListItem {
            Value = user.ProviderUserKey.ToString(),
            Text = user.UserName,
        };
        items.Add(li);
    }
    items.Add(new SelectListItem { Text = "Please Select...", Value = "na" , Selected = true});
    ViewBag.Users = items;
    return View();                
}

[HttpPost]
public ActionResult Mirko(Employee employee) {
    if(IsValideEmployee(employee)) {
        /*Only used to show that user was retrieved*/
        TempData["message"] = "Saved Employee";
        TempData["user"] = employee.User;

       /* employeeRepository.Save(employee) */

        /* Redirect to where you want to go */
        return RedirectToAction("Mirko", "Home");
    }
    return View(employee);
}

private bool IsValideEmployee(Employee emp) {
    if (emp.Name == "na")
        ModelState.AddModelError("UserId", "You must select a user!");
    /*Do some validation here*/
    //ModelState.Add("Name", "You must set the user name!")
    return ModelState.IsValid;
}

查看

@model StackOverFlowExample.Models.Employee @{ MembershipUser user = null; ViewBag.Title = "Mirko Example"; var users = ViewBag.Users as IEnumerable<SelectListItem>; } @if (TempData["message"] != null) { user = TempData["user"] as MembershipUser; <h3>@TempData["message"]</h3> <div> <span>You selected @user.UserName</span> <ul> <li>Email: @user.Email</li> <li>Last Logged In: @user.LastLoginDate.ToString("d")</li> <li>Online: @user.IsOnline</li> </ul> </div> } @using (@Html.BeginForm()) { <label for="UserId">Associate Employee To User:</label> @Html.DropDownListFor(m => m.UserId, @users) @Html.HiddenFor(m => m.Name) <input type="submit" value="Save" id="save-employee"/> } <div id="status" style="display:none;"></div> <script type="text/javascript"> $(document).ready(function () { $("#UserId").change(function () { //Set value of name $("#Name").val($(this).children("option:selected").text()); }); $("#save-employee").click(function (e) { var value = $("#Name").val(); if (value == "" || value == "na") { e.preventDefault(); $("#status").html("<h3>You must select a user!</h3>").toggle(); } }); }); </script>

ASP.NET MVC 3用户下拉列表

1 个答案: