asp.net-mvc-3 - 如何将复选框绑定(bind)到 mvc3 中的 View 模型

Question

我真的很难解决这个问题:

我有一个 UserModel 和一个 UserRoleModel:

    public class UserModel
{
    [Required]
    [Display(Name = "User name")]
    public string UserName { get; set; }

    [Required]
    [DataType(DataType.EmailAddress)]
    [Display(Name = "Email address")]
    public string Email { get; set; }

    [Required]
    [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
    [DataType(DataType.Password)]
    [Display(Name = "Password")]
    public string Password { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Confirm password")]
    [Compare("Password", ErrorMessage = "The password and confirmation password do not match.")]
    public string ConfirmPassword { get; set; }

    public IEnumerable<string> UserRoles { get; set; }
}
public class UserRoleModel
{
    public IEnumerable<string> AllRoles { get; set; }
    public UserModel user { get; set; }

    public UserRoleModel()
    {
        this.AllRoles = Roles.GetAllRoles();
        this.user = new UserModel();
    }
}

在 Controller 中:

        public ActionResult Create()
    {
        return View(new UserRoleModel());
    }

    [HttpPost]
    public ActionResult Create(UserRoleModel model)
    {
        if (ModelState.IsValid)
        {
            MembershipCreateStatus createStatus;
            Membership.CreateUser(model.user.UserName, model.user.Password, model.user.Email, null, null, true, null, out createStatus);

            if (createStatus == MembershipCreateStatus.Success)
            {
                foreach (var r in model.AllRoles)
                {
                    Roles.AddUserToRole(model.user.UserName, r);
                }

                return RedirectToAction("Index", "Home");
            }
            else
            {
                ModelState.AddModelError("", ErrorCodeToString(createStatus));
            }
        }

        return View(model);
    }

和观点:

@model BBmvc.Areas.Tools.Models.UserRoleModel

和:

@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<fieldset>
    <legend>UserModel</legend>

    <div class="editor-label">
        @Html.LabelFor(model => model.user.UserName)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.user.UserName)
        @Html.ValidationMessageFor(model => model.user.UserName)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.user.Email)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.user.Email)
        @Html.ValidationMessageFor(model => model.user.Email)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.user.Password)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.user.Password)
        @Html.ValidationMessageFor(model => model.user.Password)
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.user.ConfirmPassword)
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.user.ConfirmPassword)
        @Html.ValidationMessageFor(model => model.user.ConfirmPassword)
    </div>
    <div class="editor-field">
        @foreach (var r in @Model.AllRoles)
        {
            @Html.CheckBox(r,false)
            @Html.Label(r)
            <br />
        }
    </div>

    <p>
        <input type="submit" value="Create" />
    </p>
</fieldset>

}

首先，我无法从我的 viewModel 中弄清楚如何使用 CheckBoxFor。但它确实显示了复选框选项，所以我可以忍受它。但我无法弄清楚如何确定在发布表单时选中了哪些复选框。我似乎也破坏了客户端验证，我假设是因为我使用的是 viewModel。

Answer 1

CheckBoxFor 助手使用 bool 属性进行操作。所以你可以定义一个 View 模型:

public class RoleViewModel
{
    public string Name { get; set; }
    public bool Selected { get; set; }
}

然后修改 View 模型上的 AllRoles 属性:

public class UserRoleModel
{
    public IEnumerable<RoleViewModel> AllRoles { get; set; }
    public UserModel user { get; set; }

    public UserRoleModel()
    {
        this.AllRoles = Roles.GetAllRoles().Select(r => new RoleViewModel 
        {
            Name = r
        });
        this.user = new UserModel();
    }
}

并且在 View 中而不是写 foreach循环使用编辑器模板:

<div class="editor-field">
    @Html.EditorFor(x => x.AllRoles)
</div>

最后为 RoleViewModel 定义一个编辑器模板将为 AllRoles 的每个元素自动呈现的类型集合 ( ~/Views/Shared/EditorTemplates/RoleViewModel.cshtml)

@model RoleViewModel
@Html.CheckBoxFor(x => x.Selected)
@Html.LabelFor(x => x.Selected, Model.Name)
@Html.HiddenFor(x => x.Name)
<br />

就这样。在 Post 操作中，您将获得 AllRoles用值填充的属性。