在这种情况下，如何将数据从视图中的 HTML 表发送到 POST 方法？

Question

我在View 的HTML 表中显示了一些数据。现在，我想做的是在单击按钮时（比如SUBMIT 按钮，我想将数据发送到控制器的 POST 方法，以便我可以将数据保存到数据库中。

我尝试使用Model Binding 技术获取数据，但是，POST 方法中的ViewModel 对象是null。

模型和视图模型

// Model Model.cs    
public class MyModel
{
    [Key]
    public int Id { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
    ...
}

// ViewModel MyViewModel.cs
public class MyViewModel
{
            public int Id { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
    ...
    public List<MyModel> MyModelList { get; set; }
}

// ViewModel VMList.cs
public class VMList
{
    public List<MyViewModel> MyViewModelList { get; set; }
}

所以，我有一个名为MyModel.cs 的Model，它是数据库中的表。然后，我有一个名为ViewModel 的MyViewModel.cs' that has the same columns as theModel, in addition to some columns, plus aListofMyModeltype. Then, there is anotherViewModelcalledVMList.csthat contains a list of tuples ofMyViewModeltype. ThisViewModelis passed to theView`。

View 的构造方式如下：

查看

@model ...Models.ViewModels.VMList
...
<form asp-action="MyAction" asp-controller="MyController" id="myForm">
    <div>
        <button type="submit" value="submit" id="submitButton">Submit</button>
        <table id="myTable">
            @foreach(var item in Model.MyViewModelList)
            {
                <thead>
                    <tr>
                        <th>First Name</th>
                        <th>Last Name</th>
                        <th>Header 3</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td>
                            @item.FirstName
                        </td>
                        <td>
                            @item.LastName
                        </td>
                        <td>
                            @item.Header3
                        </td>
                    </tr>
                    @if(item.subList != null && item.subList.Count() != 0)
                    {
                        <thead>
                            <tr>
                                <th>SubList Header 1</th>
                                <th>SubList Header 2</th>
                                <th>SubList Header 3</th>
                            </tr>
                        </thead>
                        <tbody>
                            @foreach(var subItem in item.subList)
                            {
                                <tr>
                                    <td>
                                        @subItem.SubListHeader1
                                    </td>
                                    <td>
                                        @subItem.SubListHeader2
                                    </td>
                                    <td>
                                        @subItem.SubListHeader3
                                    </td>
                               </tr>
                            }
                        </tbody>
                    }
            }
        </table>
    </div>
</form>    

POST 方法

[HttpPost]
public IActionResult MyAction(VMList vmListObject)
{
    return View();
}

如何将View 中的表中显示的数据返回到Controller？

Answer 1

根据您给出的模型，尝试使用asp-for标签助手和name属性进行模型绑定。

@model  VMList
<form asp-action="MyAction" asp-controller="HomeController" id="myForm">
<div>
    <button type="submit" value="submit" id="submitButton">Submit</button>
    <table id="myTable">
        @{ int i = 0;}
        @foreach (var item in Model.MyViewModelList)
        {
            <thead>
                <tr>
                    <th>First Name</th>
                    <th>Last Name</th>
                    <th>Header 3</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>
                        <input asp-for="@item.FirstName" name="vmListObject.MyViewModelList[@i].FirstName" />

                    </td>
                    <td>
                        <input asp-for="@item.LastName" name="vmListObject.MyViewModelList[@i].LastName"/>
                    </td>
                    <td>
                        <input asp-for="@item.Header3" name="vmListObject.MyViewModelList[@i].Header3" />
                    </td>
                </tr>
                @if (item.MyModelList != null && item.MyModelList.Count() != 0)
                {
                    <thead>
                        <tr>
                            <th>SubList Header 1</th>
                            <th>SubList Header 2</th>
                            <th>SubList Header 3</th>
                        </tr>
                    </thead>
                    <tbody>
                        @{ int j = 0;}
                        @foreach (var subItem in item.MyModelList)
                        {
                            <tr>
                                <td>
                                    <input asp-for="@subItem.FirstName" name="vmListObject.MyViewModelList[@i].MyModelList[@j].FirstName"/>
                                </td>
                                <td>
                                    <input asp-for="@subItem.LastName" name="vmListObject.MyViewModelList[@i].MyModelList[@j].LastName" />
                                </td>
                                <td>
                                    test
                                </td>
                            </tr>
                            j++;
                        }

                    </tbody>
                  }
            </tbody>
           i++;
         }
    </table>
</div>
</form>