无法反序列化当前的 JSON 数组(例如 [1,2,3]) [英] Cannot deserialize the current JSON array (e.g. [1,2,3])

问题描述

我正在尝试读取我的 JSON 结果.

这是我的 RootObject

公共类RootObject{公共 int id { 获取；放;}public bool is_default { 获取；放;}公共字符串名称 { 获取；放;}公共整数数量{得到；放;}公共字符串股票{得到；放;}公共字符串 unit_cost { 获取；放;}}

这是我的 JSON 结果

[{"id": 3636, "is_default": true, "name": "Unit", "quantity": 1, "stock": "100000.00", "unit_cost": "0"}, {"id": 4592, "is_default": false, "name": "Bundle", "quantity": 5, "stock": "100000.00", "unit_cost": "0"}]

这是我读取结果的代码

 public static RootObject GetItems(string user, string key, Int32 tid, Int32 pid){//根据地理位置参数自定义 URLvar url = string.Format(uniqueItemUrl, user, key, tid, pid);//同步消费var syncClient = new WebClient();var content = syncClient.DownloadString(url);return JsonConvert.DeserializeObject(content);}

但是我遇到了这个错误的问题:

<块引用>

无法将当前 JSON 数组(例如 [1,2,3])反序列化为类型 'avaris_cash_salepoint.BL.UniqueItemDataRootObject'，因为类型需要一个 JSON 对象(例如 {"name":"value"})来反序列化正确.要修复此错误，请将 JSON 更改为 JSON 对象(例如 {"name":"value"})或将反序列化类型更改为数组或实现集合接口的类型(例如 ICollection、IList) 像可以从 JSON 数组反序列化的 List.也可以将 JsonArrayAttribute 添加到类型中以强制它从 JSON 数组反序列化.路径 ''，第 1 行，位置 1.

在这一行:return JsonConvert.DeserializeObject(content);

是否有帮助修复此错误?

解决方案

我认为您遇到的问题是您的 JSON 是一个对象列表，它与您的根类没有直接关系.

>

var content 看起来像这样(我假设):

<预><代码>[{身份证":3636，is_default":真，"name": "单位",数量":1，"股票": "100000.00",单位成本":0"},{身份证":4592，is_default":假，"name": "捆绑",数量":5，"股票": "100000.00",单位成本":0"}]

注意:使用 http://jsonviewer.stack.hu/ 来格式化您的 JSON.

因此，如果您尝试以下操作，它应该会起作用:

 public static ListGetItems(string user, string key, Int32 tid, Int32 pid){//根据地理位置参数自定义 URLvar url = string.Format(uniqueItemUrl, user, key, tid, pid);//同步消费var syncClient = new WebClient();var content = syncClient.DownloadString(url);return JsonConvert.DeserializeObject>(content);}

如果您不想返回 RootObject 的列表，则需要进行迭代.

<小时>

我继续在控制台应用中对此进行了测试，效果很好.

I am trying to read my JSON result.

Here is my RootObject

public class RootObject
{
public int id { get; set; }
public bool is_default { get; set; }
public string name { get; set; }
public int quantity { get; set; }
public string stock { get; set; }
public string unit_cost { get; set; }
}

Here is my JSON result

[{"id": 3636, "is_default": true, "name": "Unit", "quantity": 1, "stock": "100000.00", "unit_cost": "0"}, {"id": 4592, "is_default": false, "name": "Bundle", "quantity": 5, "stock": "100000.00", "unit_cost": "0"}]

Here is my code to read the result

     public static RootObject GetItems(string user, string key, Int32 tid, Int32 pid)
    {
        // Customize URL according to geo location parameters
        var url = string.Format(uniqueItemUrl, user, key, tid, pid);

        // Syncronious Consumption
        var syncClient = new WebClient();

        var content = syncClient.DownloadString(url);

        return JsonConvert.DeserializeObject<RootObject>(content);

    }

But I am having a problem with this error :

Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'avaris_cash_salepoint.BL.UniqueItemDataRootObject' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. Path '', line 1, position 1.

at this line: return JsonConvert.DeserializeObject(content);

Any help to fix this error ?

解决方案

I think the problem you're having is that your JSON is a list of objects when it comes in and it doesnt directly relate to your root class.

var content would look something like this (i assume):

[
  {
    "id": 3636,
    "is_default": true,
    "name": "Unit",
    "quantity": 1,
    "stock": "100000.00",
    "unit_cost": "0"
  },
  {
    "id": 4592,
    "is_default": false,
    "name": "Bundle",
    "quantity": 5,
    "stock": "100000.00",
    "unit_cost": "0"
  }
]

Note: make use of http://jsonviewer.stack.hu/ to format your JSON.

So if you try the following it should work:

  public static List<RootObject> GetItems(string user, string key, Int32 tid, Int32 pid)
    {
        // Customize URL according to geo location parameters
        var url = string.Format(uniqueItemUrl, user, key, tid, pid);

        // Syncronious Consumption
        var syncClient = new WebClient();

        var content = syncClient.DownloadString(url);

        return JsonConvert.DeserializeObject<List<RootObject>>(content);

    }

You will need to then iterate if you don't wish to return a list of RootObject.

---

I went ahead and tested this in a Console app, worked fine.

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