使用json对象查看IEnumerable错误答案

【问题标题】：IEnumerable erroring out on view with json object使用json对象查看IEnumerable错误
【发布时间】：2018-04-17 17:48:54
【问题描述】：

最近我在上一个问题中想出了如何正确序列化 json 字符串，但我现在很难在视图上显示结果。我修复了我的模型和控制器，但现在视图似乎是问题所在。这是我收到的错误。

编译错误说明：在编译服务此请求所需的资源期间发生错误。请查看以下特定错误详细信息并适当修改您的源代码。

编译器错误消息：CS1061：“IEnumerable”不包含“sWorkOrderNumber”的定义，并且找不到接受“IEnumerable”类型的第一个参数的扩展方法“sWorkOrderNumber”（您是否缺少 using 指令或程序集参考？）

来源错误：

第 4 行：@foreach（模型中的 var 顺序）

第 5 行：{

第 6 行：@Model.sWorkOrderNumber

第 7 行：}

我的控制器代码如下。

string url = @"URL of webservice here";

var returnValue = new WebClient().DownloadString(url);

        List<Order> shipments = JsonConvert.DeserializeObject<List<Order>>(returnValue);

        return View(shipments.ToList());

这是我的看法。

@model IEnumerable<Project.Models.Order>

@foreach (var order in Model)
{
    @Model.sWorkOrderNumber
}

这是返回的 JSON。

[{"ShipmentTrackingNUmbers":[{"sTrackingNumber":"Redacted"}],"dtDateShipped":"5/12/2017 12:00:00 AM","dSPRatedWeight":"41.0000","nMBTotalBoxes":"1","sShipToAddressLine2":"Redacted","sShipToCountry":"U.S.A.","sShipToZip":"Redacted","sShipToState":"Redacted","sShipToCity":"Redacted","sShipToAddressLine1":"Redacted","sShipToName":"Redacted","sServiceLevel":"GND","sInvoiceNumber":"","dtInvoiceDate":"","mInvoiceAmount":"","dtDateReceived":"5/8/2017 3:16:25 PM","sStudioCategory2":"","sStudioCategory1":"","sOrderSource":"Redacted","sCustomerComments":"Redacted","sCustomerOrderName":"Redacted","sWorkOrderNumber":"Redacted","sCustomerNumber":"Redacted"},{"ShipmentTrackingNUmbers":[{"sTrackingNumber":"Redacted"}],"dtDateShipped":"5/10/2016 12:00:00 AM","dSPRatedWeight":"3.0000","nMBTotalBoxes":"1","sShipToAddressLine2":"","sShipToCountry":"U.S.A.","sShipToZip":"Redacted","sShipToState":"Redacted","sShipToCity":"Redacted","sShipToAddressLine1":"Redacted","sShipToName":"Redacted","sServiceLevel":"GND","sInvoiceNumber":"","dtInvoiceDate":"","mInvoiceAmount":"","dtDateReceived":"5/2/2016 7:18:41 AM","sStudioCategory2":"","sStudioCategory1":"","sOrderSource":"Redacted","sCustomerComments":"Redacted","sCustomerOrderName":"Redacted","sWorkOrderNumber":"Redacted","sCustomerNumber":"Redacted"}]

订购型号代码

public class ShipmentTrackingNumbers
{
    public string sTrackingNumber { get; set; }
}

public class Order
{
    public List<ShipmentTrackingNumbers> ShipmentTrackingNUmbers { get; set; }

    public string dtDateShipped
    {
        get;
        set;
    }
    public string dSPRatedWeight
    {
        get;
        set;
    }
    public string nMBTotalBoxes
    {
        get;
        set;
    }
    public string sShipToAddressLine2
    {
        get;
        set;
    }
    public string sShipToCountry
    {
        get;
        set;
    }
    public string ShipToZip
    {
        get;
        set;
    }
    public string sShipToState
    {
        get;
        set;
    }
    public string sShipToCity
    {
        get;
        set;
    }
    public string sShipToAddressLine1
    {
        get;
        set;
    }
    public string sShipToName
    {
        get;
        set;
    }
    public string sServiceLevel
    {
        get;
        set;
    }
    public string sInvoiceNumber
    {
        get;
        set;
    }
    public string dtInvoiceDate
    {
        get;
        set;
    }
    public string mInvoiceAmount
    {
        get;
        set;
    }
    public string dtDateReceived
    {
        get;
        set;
    }
    public string sStudioCategory2
    {
        get;
        set;
    }
    public string sStudioCategory1
    {
        get;
        set;
    }
    public string sOrderSource
    {
        get;
        set;
    }
    public string sCustomerComments
    {
        get;
        set;
    }
    public string sCustomerOrderName
    {
        get;
        set;
    }
    public string sWorkOrderNumber
    {
        get;
        set;
    }
    public string sCustomerNumber
    {
        get;
        set;
    }
}

提前感谢您的帮助。任何指导都会很棒。

【问题讨论】：

标签： asp.net json asp.net-mvc

【解决方案1】：

如果您在以下格式的 JSON 中看到，它是一个结果数组，因此您需要循环访问它以访问任何属性。

   @foreach (var order in Model)
     {
       @Model.sWorkOrderNumber // (Wrong)
       @order.sWorkOrderNumber // (Right)
     }

同时循环用户当前对象访问属性。

[
  {
    "ShipmentTrackingNUmbers": [
      {
        "sTrackingNumber": "Redacted"
      }
    ],
    "dtDateShipped": "5/12/2017 12:00:00 AM",
    "dSPRatedWeight": "41.0000",
    "nMBTotalBoxes": "1",
    "sShipToAddressLine2": "Redacted",
    "sShipToCountry": "U.S.A.",
    "sShipToZip": "Redacted",
    "sShipToState": "Redacted",
    "sShipToCity": "Redacted",
    "sShipToAddressLine1": "Redacted",
    "sShipToName": "Redacted",
    "sServiceLevel": "GND",
    "sInvoiceNumber": "",
    "dtInvoiceDate": "",
    "mInvoiceAmount": "",
    "dtDateReceived": "5/8/2017 3:16:25 PM",
    "sStudioCategory2": "",
    "sStudioCategory1": "",
    "sOrderSource": "Redacted",
    "sCustomerComments": "Redacted",
    "sCustomerOrderName": "Redacted",
    "sWorkOrderNumber": "Redacted",
    "sCustomerNumber": "Redacted"
  },
  {
    "ShipmentTrackingNUmbers": [
      {
        "sTrackingNumber": "Redacted"
      }
    ],
    "dtDateShipped": "5/10/2016 12:00:00 AM",
    "dSPRatedWeight": "3.0000",
    "nMBTotalBoxes": "1",
    "sShipToAddressLine2": "",
    "sShipToCountry": "U.S.A.",
    "sShipToZip": "Redacted",
    "sShipToState": "Redacted",
    "sShipToCity": "Redacted",
    "sShipToAddressLine1": "Redacted",
    "sShipToName": "Redacted",
    "sServiceLevel": "GND",
    "sInvoiceNumber": "",
    "dtInvoiceDate": "",
    "mInvoiceAmount": "",
    "dtDateReceived": "5/2/2016 7:18:41 AM",
    "sStudioCategory2": "",
    "sStudioCategory1": "",
    "sOrderSource": "Redacted",
    "sCustomerComments": "Redacted",
    "sCustomerOrderName": "Redacted",
    "sWorkOrderNumber": "Redacted",
    "sCustomerNumber": "Redacted"
  }
]

【讨论】：

【解决方案2】：

您的模型是 IEnumerable<Project.Models.Order> 类型的集合，您已经在使用 foreach 迭代您的集合。

因此，您需要使用循环变量来访问集合中的每个订单值，而不是引用@Model，而是使用order 变量：

@foreach (var order in Model)
{
    @order.sWorkOrderNumber
}

您有多个来自 IEnumerable<T> 的订单对象，您需要像您正在做的那样通过 foreach 访问每个对象，但在循环体内您使用了错误的变量。

希望对你有帮助。

【讨论】：