MVC视图向控制器传值问题：POST方法中perId未获取到数据

Hey there, let's troubleshoot why your perId parameter isn't coming through in the POST request. I've run into this exact issue a few times, so here are the most common fixes to check:

MVC's model binding relies on exact, case-sensitive name matches between your view and controller. So:

• In your view, confirm the input's name attribute is exactly perId (no typos like perid, PerId, or PERID). Example:

  <!-- Hidden input example -->
  <input type="hidden" name="perId" value="@Model.PerId" />
  <!-- Visible input example -->
  <input type="text" name="perId" value="@Model.PerId" />
  

• In your controller's POST action, make sure the parameter name matches perfectly:

  [HttpPost]
  public ActionResult YourTargetAction(int perId) // Exact name here
  {
      // Your logic here
  }
  

It sounds simple, but it's easy to overlook. Confirm your form tag explicitly sets method="post":

@using (Html.BeginForm("YourTargetAction", "YourController", FormMethod.Post))
{
    <!-- Your form fields go here -->
}

If the method is missing or set to GET, the parameter won't be sent in the request body.

If you're passing a view model instead of a standalone parameter:

• Make sure your model has a PerId property (matching case if you're using automatic binding):

  public class YourViewModel
  {
      public int PerId { get; set; } // Property name must align with input name
  }
  

• In the view, use helpers or manual inputs that reference the correct property:

  @model YourViewModel
  @using (Html.BeginForm(...))
  {
      @Html.HiddenFor(m => m.PerId) <!-- Generates name="PerId" automatically -->
      <!-- Or manual input -->
      <input name="PerId" value="@Model.PerId" />
  }
  

• In the controller, access the value via the model:

  [HttpPost]
  public ActionResult YourTargetAction(YourViewModel model)
  {
      var perId = model.PerId; // Pull value from the model
  }
  

Use your browser's dev tools (F12) to see what's really being sent:

1. Open the Network tab
2. Submit the form
3. Click the POST request in the list
4. Check the Form Data (Chrome) or Payload (Firefox) section
   • If perId isn't listed here: The issue is in your view (the input isn't rendering or isn't inside the form)
   • If perId is listed but the controller doesn't get it: Check for type mismatches (e.g., expecting int but sending a non-numeric string)

If you're using [Bind(Include = "...")] or [Bind(Exclude = "...")] on your controller parameter or model, make sure perId is included:

[HttpPost]
public ActionResult YourTargetAction([Bind(Include = "perId, OtherRequiredProperty")] YourViewModel model)
{
    // Ensure perId is in the Include list
}

If your route definition includes a perId parameter, ensure it doesn't override form data. For example:

routes.MapRoute(
    name: "Default",
    url: "{controller}/{action}/{perId}",
    defaults: new { controller = "Home", action = "Index", perId = UrlParameter.Optional }
);

If you're not passing perId in the URL, this should still work, but confirm the route parameter type matches your controller's parameter type (e.g., int vs string).

内容的提问来源于stack exchange，提问作者Doğukan Gözen