I am trying to pass values from a view to a controller in MVC. I am using a ViewModel and normally the values would bind to the properties as long as the names are the same. However because the values are generated via a foreach loop the names of the values do not match the names of the properties in the view model.
I am working around this by assigning the values to a variable in Razor. However one of my values is in a text box on the form and the value is not being passed to the controller and I cannot work out why.
I get a null exception when clicking the button.
VIEW Code is below:
@model PagedList.IPagedList<Mojito.Domain.ViewModels.ShoppingCartProductItem>
@using System.Web.UI.WebControls
@using PagedList.Mvc;
<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />
@{
ViewBag.Title = "Index";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Mojito Products</h2>
<table class="table">
<tr>
<th>
@Html.DisplayNameFor(model => model.FirstOrDefault().Description)
</th>
<th>
@Html.ActionLink("Price", "Index", new { sortOrder = ViewBag.SortByPrice, currentFilter = ViewBag.CurrentFilter })
</th>
<th>
@Html.DisplayNameFor(model => model.FirstOrDefault().Quantity)
</th>
<th>
</th>
<th></th>
</tr>
@foreach (var item in Model)
{
<tr>
<td>
@Html.DisplayFor(modelItem => item.Description)
</td>
<td>
@Html.DisplayFor(modelItem => item.Price)
</td>
<td>
@Html.TextBoxFor(modelItem => item.Quantity)
</td>
<td>
@{string Description = item.Description;}
@{decimal Price = item.Price;}
@{int Quantity = item.Quantity; }
@using (Html.BeginForm("AddToCart", "ShoppingCart", FormMethod.Post))
{
<div class="pull-right">
@if (Request.Url != null)
{
<input type="text" hidden="true" name="Description" value=@Description />
<input type="text" hidden="true" name="Price" value=@Price />
<input type="text" hidden="true" name="Quantity" value=@Quantity />
@Html.Hidden("returnUrl", Request.Url.PathAndQuery)
<input type="submit" class="btn btn-success" value="Add to cart" />
}
</div>
}
</td>
</tr>
}
</table>
<div class="col-md-12">
Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of @Model.PageCount
</div>
@Html.PagedListPager(Model, page => Url.Action("Index",
new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))
Controller Code below
public ActionResult AddToCart(Cart cart, MojitoProduct product, string returnUrl, int Quantity =1)
{
if (product != null)
{
cart.AddItem(product, Quantity);
}
return RedirectToAction("Index", new { returnUrl });
}
Do not use foreach. Use a for-loop instead and within this, qualify the full path to your properties using the index.
Better yet: use a Edit- or DisplayTemplate for the ShoppingCartProductItem
. This will also keep your path.
You have to use for loop instead of foreach:
@for (int i=0;i < Model.Count; i++)
{
<tr>
<td>
@Html.DisplayFor(modelItem => Model[i].Description)
</td>
<td>
@Html.DisplayFor(modelItem => Model[i].Price)
</td>
<td>
@Html.TextBoxFor(modelItem => Model[i].Quantity)
</td>
..........................
..........................
..........................
}
you can also post all using one form by posting List<ShoppingCartProductItem>
, see Model Binding To A List
Your textboxes so values out of the form.
Try like below
@using (Html.BeginForm("AddToCart", "ShoppingCart", FormMethod.Post))
{
@foreach (var item in Model)
{
<tr>
<td>
@Html.DisplayFor(modelItem => item.Description)
</td>
<td>
@Html.DisplayFor(modelItem => item.Price)
</td>
<td>
@Html.TextBoxFor(modelItem => item.Quantity)
</td>
<td>
@{string Description = item.Description;}
@{decimal Price = item.Price;}
@{int Quantity = item.Quantity; }
<div class="pull-right">
@if (Request.Url != null)
{
<input type="text" hidden="true" name="Description" value=@Description />
<input type="text" hidden="true" name="Price" value=@Price />
<input type="text" hidden="true" name="Quantity" value=@Quantity />
@Html.Hidden("returnUrl", Request.Url.PathAndQuery)
<input type="submit" class="btn btn-success" value="Add to cart" />
}
</div>
</td>
</tr>
}
}
I resolved this in the short term by using new and forcing the name of the parameter.
@Html.HiddenFor(modelItem => t.NoOfUsers, new { Name = "NoOfUsers", id = "NoOfUsers" })
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.