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保存时的模型绑定未返回完整的嵌套对象列表，最多一个

[英]Model Binding on Save isn't returning full List of Nested Objects, maximum of one

 原文  2017-11-15 14:25:07  1   1    c#/ asp.net-mvc/ model-binding/ mvc-editor-templates

问题描述

Model Binding on Save isn't returning full List of Nested Objects, maximum of one 保存时的模型绑定未返回完整的嵌套对象列表，最多一个

Trying to understand EditorTemplates, here is a simple example that isn't working at the moment. 试图了解EditorTemplates，这是一个目前无法使用的简单示例。 The Model isn't returning the full IList of items, it seems to be returning 1 object each time when there should be 2 in my example. 模型没有返回完整的IList项，在我的示例中每次应该有2个对象时，似乎都返回了1个对象。

When I Edit ModelA, the example is: 当我编辑ModelA时，示例为： 

- Name: Model A
    List of Model Bs:
        - Name: Model B1
            List of Model Cs:
                - Name: Model C1
                - Name: Model C2
        - Name: Model B2

This list shows up properly during Edit, but upon Save, some of the information is "lost", added (not found) below. 此列表在编辑过程中正确显示，但是在保存时，某些信息“丢失”， (not found)下面添加(not found) 。 

- Name: Model A (in Model)
    List of Model Bs:
        - Name: Model B1 (in Model)
            List of Model Cs:
                - Name: Model C1 (in Model)
                - Name: Model C2 (not found)
        - Name: Model B2 (not found)

Basically, on Save, the Model is not returning any more than one object from a list. 基本上，在保存时，模型从列表中返回的对象不超过一个。

Classes: 类：

BaseObject: BaseObject： 

public class BaseObject
{
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [Key]
    public Guid Oid { get; set; }

}

ModelA, ModelB and ModelC: ModelA，ModelB和ModelC： 

public class ModelA : BaseObject
{
    public string Name { get; set; }
    public virtual IList<ModelB> ModelBs { get; set; }
}

public class ModelB : BaseObject
{
    public string Name { get; set; }

    public Guid? ModelAID { get; set; }

    [ForeignKey("ModelAID")]
    public virtual ModelA ModelA { get; set; }

    public virtual IList<ModelC> ModelCs { get; set; }
}

public class ModelC : BaseObject
{
    public string Name { get; set; }

    public Guid? ModelBID { get; set; }

    [ForeignKey("ModelBID")]
    public virtual ModelB ModelB { get; set; }
}

Basic Controller for ModelA, here is the Edit: ModelA的基本控制器，这里是编辑： 

public ActionResult Edit(Guid? id)
{
    if (id == null)
    {
        return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
    }
    ModelA modelA = db.ModelAs.Find(id);
    if (modelA == null)
    {
        return HttpNotFound();
    }
    return View(modelA);
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(ModelA modelA)
//Removed: [Bind(Include = "Oid,Name,DateCreated,DateUpdated,DateDeleted,IsDeleted")] 
{
    if (ModelState.IsValid) //Break point to review "modelA"
    {
        db.Entry(modelA).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(modelA);
}

Views: 观看次数：

Edit.cshtml (for ModelA): Edit.cshtml（用于ModelA）： 

@model x.Models.Nesting.ModelA

@using (Html.BeginForm())
{
    @Html.AntiForgeryToken()
    @Html.EditorForModel(Model)
}

Views in Views/Shared/EditorTemplates: 视图/共享/编辑器模板中的视图：

ModelA.cshtml: ModelA.cshtml： 

@model x.Models.Nesting.ModelA

<div class="form-horizontal">
    <h4>ModelA</h4>
    <hr />
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.HiddenFor(model => model.Oid)

    <div class="form-group">
        @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.ModelBs, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">

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

            @* Tried the code below as well *@
            @*
            @for (var i = 0; i < Model.ModelBs.Count(); i++)
            {
                @Html.EditorFor(m => m.ModelBs[i])
            }
            *@

        </div>
    </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>
</div>

ModelB.cshtml: ModelB.cshtml： 

@model x.Models.Nesting.ModelB
@using (Html.BeginForm())
{
    <div class="form-horizontal">
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.Oid)
        @Html.HiddenFor(model => model.ModelAID)

        <div class="form-group">
            @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.ModelCs, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">

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

                @* Tried the code below as well *@
                @*
                @foreach(var item in Model.ModelCs)
                {
                    @Html.EditorFor(x => item)
                }
                *@

            </div>
        </div>

    </div>
}

ModelC.cshtml: ModelC.cshtml： 

@model x.Models.Nesting.ModelC

@using (Html.BeginForm())
{
    <div class="form-horizontal">
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.Oid)
        @Html.HiddenFor(model => model.ModelBID)

        <div class="form-group">
            @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
            </div>
        </div>

    </div>
}

As an example from the HTML (when using @Html.EditorFor(model => model.ModelBs) ), the binding for both ModelB objects look look like they would be bound properly (but it only returns the first object): 作为HTML的示例（使用@Html.EditorFor(model => model.ModelBs) ），两个ModelB对象的绑定看起来都将被正确绑定（但只返回第一个对象）：

Model B1: 型号B1： 

<input 
    data-val="true" data-val-required="The Oid field is required." 
    id="ModelBs_f1aa613f-96f4-427f-a568-c70556ad2117__Oid" 
    name="ModelBs[f1aa613f-96f4-427f-a568-c70556ad2117].Oid" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b934">

<input 
    id="ModelBs_f1aa613f-96f4-427f-a568-c70556ad2117__ModelAID" 
    name="ModelBs[f1aa613f-96f4-427f-a568-c70556ad2117].ModelAID" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b935">

<input 
    class="form-control text-box single-line valid" 
    id="ModelBs_f1aa613f-96f4-427f-a568-c70556ad2117__Name" 
    name="ModelBs[f1aa613f-96f4-427f-a568-c70556ad2117].Name" 
    type="text" 
    value="Model B1" aria-invalid="false">

Model B2: 型号B2： 

<input 
    data-val="true" data-val-required="The Oid field is required." 
    id="ModelBs_128318da-af85-46a5-bc0d-71361610d989__Oid" 
    name="ModelBs[128318da-af85-46a5-bc0d-71361610d989].Oid" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b936">

<input 
    id="ModelBs_128318da-af85-46a5-bc0d-71361610d989__ModelAID" 
    name="ModelBs[128318da-af85-46a5-bc0d-71361610d989].ModelAID" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b935">

<input 
    class="form-control text-box single-line valid" 
    id="ModelBs_128318da-af85-46a5-bc0d-71361610d989__Name" 
    name="ModelBs[128318da-af85-46a5-bc0d-71361610d989].Name" 
    type="text" 
    value="Model B2" aria-invalid="false">

When using the for loop in ModelA, looping ModelB ( @for (var i = 0; i < Model.ModelBs.Count(); i++) { @Html.EditorFor(m => m.ModelBs[i]) } ), the Indexes are Numbers, but still don't return full Models. 在ModelA中使用for循环时，循环ModelB（ @for (var i = 0; i < Model.ModelBs.Count(); i++) { @Html.EditorFor(m => m.ModelBs[i]) } ），索引是数字，但仍不返回完整的模型。

Model B1: 型号B1： 

<input 
    data-val="true" data-val-required="The Oid field is required." 
    id="ModelBs_0__Oid" name="ModelBs[0].Oid" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b934">

<input 
    id="ModelBs_0__ModelAID" 
    name="ModelBs[0].ModelAID" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b935">

<input 
    class="form-control text-box single-line valid" 
    id="ModelBs_0__Name" name="ModelBs[0].Name" 
    type="text" 
    value="Model B1" aria-invalid="false">

Model B2: 型号B2： 

<input 
    data-val="true" data-val-required="The Oid field is required." 
    id="ModelBs_1__Oid" name="ModelBs[1].Oid" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b936">

<input 
    id="ModelBs_1__ModelAID" name="ModelBs[1].ModelAID" 
    type="hidden" 
    value="7e99950b-62c9-e711-afd4-7cb0c2b5b935">

<input 
    class="form-control text-box single-line valid" 
    id="ModelBs_1__Name" name="ModelBs[1].Name" 
    type="text" 
    value="Model B 2" aria-invalid="false">

POST Form Data : POST表格数据 ：

@Html.EditorFor(...) POST (didn't update ModelBs list of ModelCs) : @Html.EditorFor(...) POST （未更新ModelC的ModelBs列表） ： 

__RequestVerificationToken:1PfXHdYtb5eE-j6g4DWBEZiRa0trOL8UvYGKVjL0pxR1qOjQE52be7UB14VaIJRpp5UA1Iz9WXt4g_7LKixKhK7ah7Hjp6hOLmLa1m7XavI1
Oid:7e99950b-62c9-e711-afd4-7cb0c2b5b935
Name:Model A1
ModelBs.index:4a481093-9bdd-43ae-b84b-144c576ff346
ModelBs[4a481093-9bdd-43ae-b84b-144c576ff346].Oid:7e99950b-62c9-e711-afd4-7cb0c2b5b934
ModelBs[4a481093-9bdd-43ae-b84b-144c576ff346].ModelAID:7e99950b-62c9-e711-afd4-7cb0c2b5b935
ModelBs[4a481093-9bdd-43ae-b84b-144c576ff346].Name:Model B1
ModelBs[4a481093-9bdd-43ae-b84b-144c576ff346].ModelCs[0].Oid:7e99950b-62c9-e711-afd4-7cb0c2b5b936
ModelBs[4a481093-9bdd-43ae-b84b-144c576ff346].ModelCs[0].ModelBID:7e99950b-62c9-e711-afd4-7cb0c2b5b934
ModelBs[4a481093-9bdd-43ae-b84b-144c576ff346].ModelCs[0].Name:Model C 1
ModelBs.index:a1dd130d-a1f7-47ed-90a2-28055a960c9b

For loop POST: For循环POST： 

__RequestVerificationToken:x9hpnm-c1g0Cm9gTnSRjCFIVflziqXqiO3iFkzVpMc33gnNlBoDsvwBHMmRT38sWTCGrFSqCqzcuuBZdXLsXTgX1EbkqUSqPuAtwUrR1XXA1
Oid:7e99950b-62c9-e711-afd4-7cb0c2b5b935
Name:Model A1
ModelBs[0].Oid:7e99950b-62c9-e711-afd4-7cb0c2b5b934
ModelBs[0].ModelAID:7e99950b-62c9-e711-afd4-7cb0c2b5b935
ModelBs[0].Name:Model B1
ModelBs[0].ModelCs[0].Oid:7e99950b-62c9-e711-afd4-7cb0c2b5b936
ModelBs[0].ModelCs[0].ModelBID:7e99950b-62c9-e711-afd4-7cb0c2b5b934
ModelBs[0].ModelCs[0].Name:Model C 1

EditorFor has ModelBs.index twice (hopeful this leads to a solution), but not in the For . EditorFor有两次ModelBs.index（希望这会导致解决方案），但是在For没有。 Something getting cut off> (I double and triple checked that I wasn't missing something further down) 某些东西被截断了>（我仔细检查了三遍，以确保我没有错过更多内容）

FireFox POST data, looks like the Indexes of 0 and 1 are working to some extent: FireFox POST数据，看起来索引0和1在某种程度上起作用： 

__RequestVerificationToken  qlrlO7Z0_byGZYLGJ6Tbx5Fzmpd0dd6b-JPac4V-f1U-17v06OQr27dYZPh_VmRI3X4nGj7ZAOHtBdERnuZscJlNlgoHAqdeXaNQN04e2qE1
Oid 7e99950b-62c9-e711-afd4-7cb0c2b5b935
Name    Model+A1
ModelBs.index   […]
0   3d003e30-d350-4fb0-becd-f65207b033c4
1   be4e35c3-3fee-4c7f-9ee7-580b6e0c8169
ModelBs[3d003e30-d350-4fb0-becd-f65207b033c4].Oid   7e99950b-62c9-e711-afd4-7cb0c2b5b934
ModelBs[3d003e30-d350-4fb0-becd-f65207b033c4].ModelAID  7e99950b-62c9-e711-afd4-7cb0c2b5b935
ModelBs[3d003e30-d350-4fb0-becd-f65207b033c4].Name  Model+B1
ModelBs[3d003e30-d350-4fb0-becd-f65207b033c4].ModelCs[0].Oid    7e99950b-62c9-e711-afd4-7cb0c2b5b936
ModelBs[3d003e30-d350-4fb0-becd-f65207b033c4].ModelCs[0].ModelBID   7e99950b-62c9-e711-afd4-7cb0c2b5b934
ModelBs[3d003e30-d350-4fb0-becd-f65207b033c4].ModelCs[0].Name   Model+C+1

... the mystery continues ...奥秘还在继续

1 个解决方案

解决方案1
 0 已采纳  2017-11-15 21:49:00

The EditorTemplate files (cshtml) for ModelB and ModelC had @using (Html.BeginForm()) { ... } , removing this resolved the issue, allowing the POST to contain all the information. 用于ModelB和ModelC的EditorTemplate文件（cshtml）具有@using (Html.BeginForm()) { ... } ，消除了此问题，从而允许POST包含所有信息。 Kept the BeginForm on ModelA, that is required. 将BeginForm保留在BeginForm上，这是必需的。

I figured it out when reviewing the POST information, it showed a(n) .index for the second ModelB, but no associated data, it also has a form tag directly below, everyone knows that many form tags isn't good. 我在查看POST信息时发现了该错误，它显示了第二个ModelB的a.n.index，但没有关联的数据，它的正下方还有一个form标签，每个人都知道很多表单标签都不好。

Updated cshtml 更新了cshtml

ModelB.cshtml: ModelB.cshtml： 

@model x.Models.Nesting.ModelB

<div class="form-horizontal">

    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.HiddenFor(model => model.Oid)
    @Html.HiddenFor(model => model.ModelAID)

    <div class="form-group">
        @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
        </div>
    </div>

    <div class="form-group">
        @Html.LabelFor(model => model.ModelCs, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">

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

            @* Tried the code below as well *@
            @*
            @foreach(var item in Model.ModelCs)
            {
                @Html.EditorFor(x => item)
            }
            *@

        </div>
    </div>

</div>

ModelC.cshtml: ModelC.cshtml： 

@model x.Models.Nesting.ModelC

<div class="form-horizontal">

    @Html.ValidationSummary(true, "", new { @class = "text-danger" })
    @Html.HiddenFor(model => model.Oid)
    @Html.HiddenFor(model => model.ModelBID)

    <div class="form-group">
        @Html.LabelFor(model => model.Name, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.EditorFor(model => model.Name, new { htmlAttributes = new { @class = "form-control" } })
            @Html.ValidationMessageFor(model => model.Name, "", new { @class = "text-danger" })
        </div>
    </div>

</div>

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