Question

我有以下型号：

select

遵循GET方法：

public class ProjectMemberUserRolesViewModel
{
    public List<ProjectMemberUserRolesElementViewModel> Elements { get; set; }
}

public class ProjectMemberUserRolesElementViewModel
{
    public string AccessType { get; set; }
    public bool Delete { get; set; }
    public bool Create { get; set; }
    public bool Edit { get; set; }
    public bool Read { get; set; }
}

查看型号：

    public ActionResult UserRoles(int id)
    {
        ProjectMemberUserRolesViewModel model = new ProjectMemberUserRolesViewModel();
        model.Elements = (from i in db.ProjectAccessTypes
                          select new ProjectMemberUserRolesElementViewModel()
                          {
                              AccessType = i.Type,
                              Create = i.ProjectMemberAccess.Where(p => p.ProjectMemberID == id).Select(p => p.Create).FirstOrDefault(),
                              Delete = i.ProjectMemberAccess.Where(p => p.ProjectMemberID == id).Select(p => p.Delete).FirstOrDefault(),
                              Edit = i.ProjectMemberAccess.Where(p => p.ProjectMemberID == id).Select(p => p.Edit).FirstOrDefault(),
                              Read = i.ProjectMemberAccess.Where(p => p.ProjectMemberID == id).Select(p => p.Read).FirstOrDefault()
                          }).ToList();
        return View(model);
    }

和POST方法

@model ProjectMemberUserRolesViewModel

@{
    ViewBag.Title = "UserRoles";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>UserRoles</h2>

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    foreach (var item in Model.Elements)
    {
        <div>
            @Html.DisplayFor(modelItem => item.AccessType)
        </div>
        <div>
            @Html.CheckBoxFor(modelItem => item.Delete) @Html.DisplayNameFor(modelItem => item.Delete)
            @Html.CheckBoxFor(modelItem => item.Create) @Html.DisplayNameFor(modelItem => item.Create)
            @Html.CheckBoxFor(modelItem => item.Edit) @Html.DisplayNameFor(modelItem => item.Edit)
            @Html.CheckBoxFor(modelItem => item.Read) @Html.DisplayNameFor(modelItem => item.Read)
        </div>
    }

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="Save" class="btn btn-default" />
        </div>
    </div>
}

问题是对于POST方法，ProjectMemberUserRolesViewModel模型参数为null。如果我查看页面源代码，我看到，foreach元素没有前缀：

        [HttpPost]
        public ActionResult UserRoles(ProjectMemberUserRolesViewModel model)
        {
//........
            return View(model);
        }

如何正确查看代码？

Answer 1

如何正确查看代码？

将foreach循环替换为for：

for (var i = 0; i < Model.Elements.Count; i++)
{
    <div>
        @Html.DisplayFor(x => x.Elements[i].AccessType)
    </div>
    <div>
        @Html.CheckBoxFor(x => x.Elements[i].Delete) 
        @Html.DisplayNameFor(x => x.Elements[i].Delete)

        @Html.CheckBoxFor(x => x.Elements[i].Create) 
        @Html.DisplayNameFor(x => x.Elements[i].Create)

        @Html.CheckBoxFor(x => x.Elements[i].Edit) 
        @Html.DisplayNameFor(x => x.Elements[i].Edit)

        @Html.CheckBoxFor(x => x.Elements[i].Read) 
        @Html.DisplayNameFor(x => x.Elements[i].Read)
    </div>
}

或使用编辑器模板：

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()

    @Html.EditorFor(x => x.Elements)

    <div class="form-group">
        <div class="col-md-offset-2 col-md-10">
            <input type="submit" value="Save" class="btn btn-default" />
        </div>
    </div>
}

然后在相应的编辑器模板内部，它将由ASP.NET MVC为集合~/Views/Shared/EditorTemplates/ProjectMemberUserRolesElementViewModel.cshtml的每个元素自动呈现：

@model ProjectMemberUserRolesElementViewModel

<div>
    @Html.DisplayFor(x => x.AccessType)
</div>
<div>
    @Html.CheckBoxFor(x => x.Delete) 
    @Html.DisplayNameFor(x => x.Delete)

    @Html.CheckBoxFor(x => x.Create) 
    @Html.DisplayNameFor(x => x.Create)

    @Html.CheckBoxFor(x => x.Edit) 
    @Html.DisplayNameFor(x => x.Edit)

    @Html.CheckBoxFor(x => x.Read) 
    @Html.DisplayNameFor(x => x.Read)
</div>

在调用“POST”方法之前填充模型

1 个答案: