ASP.NET Core: "404 Not Found" Error when navigating to Delete Action

Question

I have an ASP.NET Core application with a RobotController that includes a Delete method. I also have Details and Delete views. In the Details view, there is a "Delete" button that should navigate to the Delete action in the RobotController. However, when I click the "Delete" button, I get a "404 Not Found" error

Here is my Delete and DeleteConfirmed methods of RobotController

    [HttpGet]
    public async Task<IActionResult> Delete(string id)
    {
        if (id == null)
        {
            return NotFound();
        }

        var robot = await _robotRepo.GetRobotByIdAsync(id);

        if (robot == null)
        {
            return NotFound();
        }

        var robotDetails = new RobotDetailsViewModel
        {
            Id = robot.Id,
            Name = robot.Name
        };

        return View("Delete", robotDetails);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> DeleteConfirmed(string id)
    {
        await _robotRepo.DeleteRobotByIdAsync(id);
        TempData["SuccessMessage"] = "Robot deleted successfully";
        return RedirectToAction("Index");
    }

Here is my Details view:

@model AnyTaskRobotStore.ViewModels.RobotDetailsViewModel

<div class="container mt-5">
    <div class="row">
        <div class="col-md-6">
            <img src="@Model.Image" class="img-fluid" alt="@Model.Name" />
        </div>
        <div class="col-md-6">
            @* Lots of markup *@
            <div class="mt-3">
                @* Buttons *@
                <a asp-action="Delete" asp-route-id="@Model.Id" class="btn btn-danger mx-2"><i class="fa-solid fa-trash"></i> &nbsp; Delete</a>
            </div>
        </div>
    </div>
</div>

And here is my Delete view:

@model AnyTaskRobotStore.ViewModels.RobotDetailsViewModel

<div class="container mt-5">
    <h2>Delete Robot</h2>
    <p>Are you sure you want to delete this robot: @Model.Name?</p>

    <form asp-action="DeleteConfirmed" method="post">
        <input type="hidden" asp-for="Id" />
        <div class="form-group">
            <input type="submit" value="Delete" class="btn btn-danger" id="deleteButton" />
            <a asp-action="Details" asp-route-id="@Model.Id" class="btn btn-secondary ms-2">Back to Details</a>
        </div>
    </form>
</div>

I have verified that the Delete and Details views exist in the Views/Robot folder. Despite this, I still encounter the "404 Not Found" error. What could be causing this issue, and how can I resolve it?

It seems I've figured out the issue. The id is coming in as null — Nick
– Nick, Commented Dec 6, 2024 at 16:47

Vignesh Kumar A · Accepted Answer · 2024-12-09 09:10:02Z

-1

As per your code, You have mentioned if id is null then return NotFound(); or if robot == null then return NotFound();

So make sure, while debugging the code, id i having value and robot also having the value, otherwise you will end up with 404.

answered Dec 9, 2024 at 9:10

Vignesh Kumar A

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