Why is my ASP.NET MVC form array property null after submission?

Solve the problem of submitting the ASP.NET MVC table array

In ASP.NET MVC, submitting a form containing the object array may encounter problems. For example:

Your form contains multiple lines, each line represents one project in the array. You use jQuery to dynamically add and delete lines. However, after submitting the form, the array attributes in the model are empty.

Solution:

To solve this problem, you need to manually generate the control of the array in the for loop. This ensures the correct name of the control of the control.

Modified code:

In the view: In the controller:

Other precautions:

@using (Html.BeginForm("Save", "ConnectBatchProduct", FormMethod.Post))
{
  ....
  <table>
    ....
    @for(int i = 0; i < Model.BatchProducts.Count; i++)
    {
      <tr>
        <td>@Html.TextBoxFor(m => m.BatchProducts[i].Quantity)</td>
        <td>@Html.TextBoxFor(m => m.BatchProducts[i].BatchName)</td>
        <td>
          <!-- 包含隐藏输入以跟踪项目索引 -->

          <a>

If you want to add and delete the items in the view, you can use the

public ActionResult Save(ConnectBatchProductViewModel model)
{
  ....
}

auxiliary method or HTML template. For example, you can create a template for adding new projects:

Then you can use JavaScript to dynamically add the new project to the form:

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