mvc音乐商店中的paypal iPN问题

发布于 2024-10-06 07:33:18 字数 1349 浏览 0 评论 0原文

我试图将购物车中的商品传递给 PayPal，但收到以下错误：

对象引用未设置为对象的实例。

我的代码是：

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> 地址及付款方式

<h1>Checkout with PayPal</h1>

<form id="PayPal" name="PayPal" action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" />

<input type="hidden" name="cmd" value="_cart" />
<input type="hidden" name="upload" value="1" />
<input type="hidden" name="business" value="[email protected]" />

<% foreach (var item in Model.CartItems)
   { %>
<%=Html.Hidden("item_name" + item.Count.ToString(), item.Design.Title)%>
<%=Html.Hidden("amount" + item.Count.ToString(), item.Design.Price)%>
<%=Html.Hidden("quantity" + item.Count.ToString(), item.Count.ToString())%>
<%=Html.Hidden("shipping" + item.Count.ToString(), 0)%>
<%=Html.Hidden("handling" + item.Count.ToString(), 0)%>
<% } %>
<input type="image" src="https://fpdbs.paypal.com/dynamicimageweb?cmd=_dynamic-image" align="left" />

该错误突出显示 Model.CartItems 中的 foreach 项目 - 但是在上一页上该项目不为空。似乎该项目将显示为空。

原文

I am trying to pass my items in the cart to paypal and am receiving the following error:

Object reference not set to an instance of an object.

My code is:

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %>

Address and Payment

<h1>Checkout with PayPal</h1>

<form id="PayPal" name="PayPal" action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post" />

<input type="hidden" name="cmd" value="_cart" />
<input type="hidden" name="upload" value="1" />
<input type="hidden" name="business" value="[email protected]" />

<% foreach (var item in Model.CartItems)
   { %>
<%=Html.Hidden("item_name" + item.Count.ToString(), item.Design.Title)%>
<%=Html.Hidden("amount" + item.Count.ToString(), item.Design.Price)%>
<%=Html.Hidden("quantity" + item.Count.ToString(), item.Count.ToString())%>
<%=Html.Hidden("shipping" + item.Count.ToString(), 0)%>
<%=Html.Hidden("handling" + item.Count.ToString(), 0)%>
<% } %>
<input type="image" src="https://fpdbs.paypal.com/dynamicimageweb?cmd=_dynamic-image" align="left" />

The error is highlighting the foreach item in Model.CartItems - however on the previous page this item is not null. Seems that item is coming up as null.

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梦旅人picnic 2024-10-13 07:33:18

确保您在渲染此视图的控制器操作中传递模型，并且此模型的 CartItems 属性不为空：

public ActionResult Foo()
{
    ShoppingCartViewModel model = FetchYourModelFromSomewhere();
    // at this stage model and model.CartItems should not be null
    return View(model);
}

我不知道您所说的模型不是什么意思上一页为 null，但控制器操作应始终将模型传递给视图。

Make sure that you are passing the model in the controller action rendering this view and that the CartItems property of this model is not null:

public ActionResult Foo()
{
    ShoppingCartViewModel model = FetchYourModelFromSomewhere();
    // at this stage model and model.CartItems should not be null
    return View(model);
}

I don't know what do you mean when saying that the model is not null on the previous page but the controller action should always pass a model to the view.

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