无法反序列化当前 JSON 对象，xamarin.forms 中的错误

Question

我在我的 Xamarin.forms 应用程序中发出 Api 请求，该请求是显示商店列表，但它引发以下异常： 无法将当前 JSON 对象（例如 {"name":"value"}）反序列化为类型“System.Collections.Generic.List`1[LoyaltyWorx.Page1+Store]”，因为该类型需要 JSON 数组（例如 [1, 2,3]) 正确反序列化。

Json 响应：

{
    "Credentials": {
        "Token": "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==",
        "Authenticated": true,
        "SecretKey": null
    },
    "Companies": [
        {
            "CustomerID": 2,
            "CompanyName": "Posworx",
            "CompanyLogo": "\Images\\Capture.JPG",
            "Stores": [
                {
                    "StoreID": 2,
                    "StoreNumber": null,
                    "StoreName": "Pos Store",
                    "StoreAddress": "218 Stamford Hill Road",
                    "StoreCity": "Durban",
                    "StoreRegion": "KZN",
                    "StoreCountry": "South Africa"
                },
                {
                    "StoreID": 4,
                    "StoreNumber": null,
                    "StoreName": "Pos Store",
                    "StoreAddress": "218 Mathews Meyiwa Road",
                    "StoreCity": "Durban",
                    "StoreRegion": "KZN",
                    "StoreCountry": "South Africa"
                }
]
        },

Xamarin.Forms 中的类：

 public class Store
        {
            public List<Company> companies { get; set; }
            public int StoreID { get; set; }
            public object StoreNumber { get; set; }
            public string StoreName { get; set; }
            public string StoreAddress { get; set; }
            public string StoreCity { get; set; }
            public string StoreRegion { get; set; }
            public string StoreCountry { get; set; }
        }
        public class Credentials
        {
            public string Token { get; set; }
            public bool Authenticated { get; set; }
            public object SecretKey { get; set; }
        }
        public class Company
        {
            public int CustomerID { get; set; }
            public string CompanyName { get; set; }
            public string CompanyLogo { get; set; }
            public IList<Store> Stores { get; set; }
        }

        public class Stores
        {
            public Credentials Credentials { get; set; }
            public IList<Company> Companies { get; set; }
            public bool IsError { get; set; }
            public object ErrorMessage { get; set; }
        }

加载和反序列化响应的代码：

public async void LoadData()
{
    try
    {
        var content = "";
        HttpClient client = new HttpClient();
        var RestUrl = "/api/Company/GetCustomerCompanies";
        client.BaseAddress = new Uri(RestUrl);

        client.DefaultRequestHeaders.Add("X-Giftworx-App", "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==");
        HttpResponseMessage response = await client.GetAsync(RestUrl);
        content = await response.Content.ReadAsStringAsync();
        var Items = JsonConvert.DeserializeObject<List<Store>>(content);
        MainListView.ItemsSource = Items;
    }


    catch (Exception ex)
    {
        string exception = ex.Message;
    }

}

目标是在 ListView 中显示 CompanyName 和 CompanyLogo：Xaml：

<ListView Grid.Column="0" Grid.Row="0"
                  x:Name="MainListView"
                  HasUnevenRows="True" 
                  VerticalOptions="FillAndExpand"
                  HorizontalOptions="FillAndExpand"
                  ItemTapped="MainListView_ItemTapped" 
                  SeparatorColor="DarkGray">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <ImageCell ImageSource="{Binding CompanyLogo}" 
                               Text="{Binding CompanyName}" 
                               TextColor="Black"
                              />
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>

Answer 1

您正在尝试将 JSON 序列化为 List<Store>。无论如何，您提供的 JSON 不是数组（如例外所述），而是单个 Store。您必须将其反序列化为 Store 对象才能正常工作。

使用 Json.NET，您可以实现这一目标

var store = JsonConvert.DeserializeObject<Store>(jsonResponse);

编辑：

在尝试更好地理解你的 sn-ps 之后，我得出了结论，

var stores = JsonConvert.DeserializeObject<Stores>(jsonResponse); 

可能比第一个 sn-p 更符合您的需要。 JSON 响应看起来更像 Stores 类而不是 Store 类。

编辑 2：

JSON 不正确，我删除了末尾的逗号并添加了 ] 和 } 以使其有效。

{
    "Credentials": {
        "Token": "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==",
        "Authenticated": true,
        "SecretKey": null
    },
    "Companies": [{
            "CustomerID": 2,
            "CompanyName": "Posworx",
            "CompanyLogo": "\Images\\Capture.JPG",
            "Stores": [{
                    "StoreID": 2,
                    "StoreNumber": null,
                    "StoreName": "Pos Store",
                    "StoreAddress": "218 Stamford Hill Road",
                    "StoreCity": "Durban",
                    "StoreRegion": "KZN",
                    "StoreCountry": "South Africa"
                }, {
                    "StoreID": 4,
                    "StoreNumber": null,
                    "StoreName": "Pos Store",
                    "StoreAddress": "218 Mathews Meyiwa Road",
                    "StoreCity": "Durban",
                    "StoreRegion": "KZN",
                    "StoreCountry": "South Africa"
                }
            ]
        }
    ]
}

将这个固定的 JSON 反序列化为 Stores（第二个 sn-p）对我有用。