我想在同一页面上创建一个单一的页面来创建新的父项和子项.我添加了一个动作,返回部分视图,并将子HTML添加到父视图中,但是我不知道如何将动作中新创建的子对象与原始父项关联(换句话说,我如何添加新的子实体在父实体中收集这些实体).

我猜,当我提交表单时,动作应该在父集合中收集新创建的子节点.

所以为了使事情变短,创建子实体的操作代码应该是什么,以及孩子如何添加到其父集合？

我已经阅读了很多帖子(和其他网站),找不到一个例子.

该应用程序使用MVC 4和实体框架5.

代码示例(我删除了一些代码保持简单).
该模型是Form(Parent)和FormField(child)实体.

public partial class Form
{ 
    public int ID { get; set; }
    public string Name { get; set; }

    public virtual ICollection<FormField> FormFields { get; set; }
}

public partial class FormField
{
    public int ID { get; set; }
    public string Name { get; set; }
    public int FormID { get; set; }
}

以下部分视图(_CreateFormField.cshtml)创建新的FormField(子).

@model FormField

@using (Html.BeginForm()) {
@Html.ValidationSummary(true)

<fieldset>
    <legend>FormField</legend>

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

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


</fieldset>
}

并且以下视图(Create.cshtml)是创建窗体的视图.

@model Form

@using (Html.BeginForm()) {
@Html.ValidationSummary(true)

<fieldset>
    <legend>Form</legend>

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

<div>
        @Html.ActionLink(
                "Add Field","CreateFormField",new { id = -1},new { @class = "form-field" })
    </div>
    <p>
        <input type="submit" value="Create" />
    </p>
</fieldset>
}

<div>
    @Html.ActionLink("Back to List","Index")
</div>

<div id="CreateFormField"></div>

@section Scripts {
<script>
    $(function () {
        $('.form-field').on('click',function (e) {

            $.get($(this).prop('href'),function (response) {
                $('#CreateFormField').append(response)
            });

            e.preventDefault();
        });
    });
</script>

@Scripts.Render("~/bundles/jqueryval")

}

以下操作处理FormController中的创建.

[HttpPost]
public ActionResult Create(Form form)
{
    if (ModelState.IsValid)
    {
        db.Forms.Add(form);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

    return View(form);
}

public ActionResult CreateFormField(string id = null)
{
    // I guess something is missing here.

    return PartialView("_CreateFormField",new FormField());
}

提前致谢,

沙龙.