c# - ASP.NET MVC 表单之一没有收到验证消息

Question

我的问题是：我创建了一个视图，希望能够在其中删除和添加新的身份角色。为此，我创建了两种调用两种不同操作的表单。我创建了一个大模型，它由较小的模型组成，这些模型由表单绑定到动作。一切都按预期工作，模型被正确绑定，数据在那里并且正确的动作被执行。

不要误会我的意思，我知道这些是单独的表单，我知道它们永远不会同时显示验证消息，因为一次只能发布一个表单。问题是，当我在CreateNewRole表单上单击提交时，验证消息就在那里，但是当我在RemoveRoles操作上单击提交时，我没有收到任何验证消息并且没有将验证类应用于 html 元素，通常"field-validation-valid" 并且没有 "field-validation-error" 类，而它完美地存在于CreateNewRole.

为什么验证适用于第一个表单而不适用于第二个表单？我找不到这两种表格的制作方式有什么不同，我没有注意到什么吗？

当我调试RemoveRoles动作的模型状态时，错误就在那里，但不知何故，视图没有得到通知。

看法

@model Models.ViewModels.RolePanelViewModel    
@using Extensions

<h2>Role Panel</h2>

<article>
    <div class="admin-panel-flex-container">
        <div class="form-container">
            @using (Html.BeginForm("CreateNewRole", "Administrator"))
            {
                <div class="form-group">
                    @Html.LabelFor(l => l.NewRoleRolePanelViewModel.NewIdentityRole.Name)
                    @Html.TextBoxFor(t => t.NewRoleRolePanelViewModel.NewIdentityRole.Name)
                    @Html.ValidationMessageFor(t => t.NewRoleRolePanelViewModel.NewIdentityRole.Name)
                    <button type="submit">Dodaj role</button>
                </div>
            }
        </div>

        <div class="form-container">
            @using (Html.BeginForm("RemoveRoles", "Administrator"))
            {
                <div class="form-group">
                    @Html.LabelFor(l => l.ListRolePanelViewModel.SelectedIdentityRoles)
                    @Html.ListBoxFor(l => l.ListRolePanelViewModel.SelectedIdentityRoles, @Model.ListRolePanelViewModel.IdentityRolesSelectListItems)
                    @Html.ValidationMessageFor(t => t.ListRolePanelViewModel.SelectedIdentityRoles)
                    <button type="submit">Skasuj wybrane</button>
                </div>
            }
        </div>

    </div>
</article>

楷模

public class RolePanelViewModel
{
    public ListRolePanelViewModel ListRolePanelViewModel { get; set; }
    public NewRoleRolePanelViewModel NewRoleRolePanelViewModel { get; set; }
}

public class ListRolePanelViewModel
{
    public List<IdentityRoleDTO> IdentityRoles { get; set; }
    public List<SelectListItem> IdentityRolesSelectListItems { get; set; }
    [Required(ErrorMessage = "Należy wybrać przynajmniej jedną pozycję z listy")]
    public List<string> SelectedIdentityRoles { get; set; }        
}

public class NewRoleRolePanelViewModel
{
    public IdentityRoleDTO NewIdentityRole { get; set; }
}
public class IdentityRoleDTO
{
    public string Id { get; set; }
    [Required(ErrorMessage = "Nowa rola musi mieć nazwę")]
    [MinLength(5)]
    public string Name { get; set; }
    public List<IdentityUserRole> Users { get; set; }
}

行动

public ActionResult OpenRolePanel()
{
    var roles = _context.Roles.ToList();
    var viewModel = new RolePanelViewModel
    {
        ListRolePanelViewModel = new ListRolePanelViewModel
        {
            IdentityRolesSelectListItems = GetSelectListItems(roles,
                (a) => new SelectListItem {Value = a.Id.ToString(), Selected = false, Text = a.Name})

        },
        NewRoleRolePanelViewModel = new NewRoleRolePanelViewModel()

    };
    return View("RolePanel", viewModel);
} 

[HttpPost]
public async Task<ActionResult> CreateNewRole(NewRoleRolePanelViewModel newRoleRolePanelViewModel)
{
    if(!ModelState.IsValid)
    {
        var roles = _context.Roles.ToList();
        var viewModel = new RolePanelViewModel
        {
            ListRolePanelViewModel = new ListRolePanelViewModel
            {
                IdentityRolesSelectListItems = GetSelectListItems(roles,
                    (a) => new SelectListItem { Value = a.Id.ToString(), Selected = false, Text = a.Name })

            },
            NewRoleRolePanelViewModel = newRoleRolePanelViewModel
        };
        return View("RolePanel", viewModel);
    }
    var roleStore = new RoleStore<IdentityRole>(new ApplicationDbContext());
    var roleManager = new RoleManager<IdentityRole>(roleStore);

    await roleManager.CreateAsync(new IdentityRole(newRoleRolePanelViewModel.NewIdentityRole.Name));


    return View("RolePanel");
}

[HttpPost]
public ActionResult RemoveRoles(ListRolePanelViewModel listRolePanelViewModel)
{
    if (!ModelState.IsValid)
    {
        var roles = _context.Roles.ToList();
        var viewModel = new RolePanelViewModel
        {
            ListRolePanelViewModel = listRolePanelViewModel,
            NewRoleRolePanelViewModel = new NewRoleRolePanelViewModel()
        };
        viewModel.ListRolePanelViewModel.IdentityRolesSelectListItems = GetSelectListItems(roles,
            (a) => new SelectListItem {Value = a.Id.ToString(), Selected = false, Text = a.Name});

        return View("RolePanel", viewModel);
    }

    return View("RolePanel");
}

如果要运行代码可能需要的自定义方法

private List<SelectListItem> GetSelectListItems<T>(List<T> dbSetResult, Func<T,SelectListItem> Func)
        {          
            var result = new List<SelectListItem>();

            foreach (var item in dbSetResult)
            {
                result.Add(Func(item));
            }

            return result;
        }

标签： c#asp.net-mvcforms