Csharp ASP.NET MVC购物车数量更新并从购物车中删除项目

我是新来的，请不要对我太苛刻了.

我创建了Cart，并try 更新视图中的项目数量，同时删除项目.但都没什么用.请帮帮我，伙计们.

以下是我的视图模型、服务、控制器和视图:

public class CartItemViewModel
{
    public int Id { get; set; }
    public int ProductId { get; set; }
    public string ProductName { get; set; } = string.Empty;
    public string ProductImageUrl { get; set; } = string.Empty;

    [Required(ErrorMessage = RequireErrorMessage)]
    [Range(OrderItemQuantityMinValue,OrderItemQuantityMaxValue,
        ErrorMessage = QuantityErrorMessage)]
    public int Quantity { get; set; }
    public decimal ProductPrice { get; set; }
    public decimal TotalPrice { get; set; }
    public int CartId { get; set; } 
}

public class CartViewModel
{
    public int Id { get; set; }
    public string UserId { get; set; } = null!;
    public decimal GrandTotal { get; set; }
    public IEnumerable<CartItemViewModel> CartItems { get; set; } = new List<CartItemViewModel>();
}

public async Task<bool> RemoveCartItemFromCartAsync(int cartItemId)
{
     var cartItem = await context.CartsItems.FindAsync(cartItemId);

     if (cartItem != null)
     {
         context.CartsItems.Remove(cartItem);
         await context.SaveChangesAsync();
         return true;
     }

     return false;
}

public async Task<bool> UpdateCartItemQuantityAsync(int cartItemId, int newQuantity)
{
     var cartItem = await context.CartsItems.FindAsync(cartItemId);

     if (cartItem != null)
     {
         cartItem.Quantity = newQuantity;
         await context.SaveChangesAsync();
         return true;
     }

     return false;
}

[HttpPost]
public async Task<IActionResult> RemoveFromCart(int cartItemId)
{
    try
    {
        var result = await cartService.RemoveCartItemFromCartAsync(cartItemId);

        if (!result)
        {
            return NotFound();
        }
        
        return RedirectToAction(nameof(Cart));
    }
    catch (Exception)
    {
        return BadRequest();
    }
}

[HttpPost]
public async Task<IActionResult> UpdateCartItemQuantity(int cartItemId, int newQuantity)
{
    if (newQuantity <= 0)
    {
        return BadRequest("Invalid quantity.");
    }

    try
    {
        var result = await cartService.UpdateCartItemQuantityAsync(cartItemId, newQuantity);

        if (!result)
        {
            return NotFound();
        }

        return RedirectToAction(nameof(Cart));
    }
    catch (Exception )
    {
        return BadRequest();
    }
}

@model CartViewModel

<div class="row">
    <div class="col-12">
        <h1>Your Cart</h1>

        @if (Model.CartItems.Any())
        {
            <table class="table table-bordered">
                <thead>
                    <tr>
                        <th>Image</th>
                        <th>Name</th>
                        <th>Quantity</th>
                        <th>Price</th>
                        <th>Total</th>
                        <th>Action</th>
                    </tr>
                </thead>
                <tbody>
                    @foreach (var item in Model.CartItems)
                    {
                        <tr>
                            <td>
                                <img src="@item.ProductImageUrl" alt="Product Image" width="100px" height="100px" />
                            </td>
                            <td>@item.ProductName</td>
                            <td>
                                <form asp-controller="Cart" asp-action="UpdateCartItemQuantity" method="post">
                                    <input type="hidden" name="cartItemId" value="@item.Id" />
                                    <input type="number" name="newQuantity" value="@item.Quantity" min="1" />
                                    <button type="submit">Update</button>
                                </form>
                            </td>
                            <td>$@item.ProductPrice</td>
                            <td>$@item.TotalPrice</td>
                            <td>
                                <form asp-controller="Cart" asp-action="RemoveFromCart" method="post">
                                    <input type="hidden" name="cartItemId" value="@item.Id" />
                                    <button type="submit">Remove</button>
                                </form>
                            </td>
                        </tr>
                    }
                </tbody>
            </table>

            <div class="text-right">
                <h3>Total Amount</h3>
                <h3>Grand Total: $@Model.GrandTotal</h3>
                <a asp-action="Checkout" asp-controller="Order" class="btn btn-info">Proceed To Checkout</a>
            </div>
        }
        else
        {
            <p>Your cart is empty.</p>
        }
    </div>
</div>

我只想让这件事正常工作，然后继续下订单