C# 指定的强制转换在HttpClient请求中无效

我正在使用xamarin.forms开发一个应用程序，当执行GET请求以在视图中显示CompanyName和CompanyLogo时，它会引发以下异常：异常： System.InvalidCastException:指定的强制转换无效。发生。任何关于如何解决此问题的帮助都将不胜感激。谢谢下面是我的代码

我的Json响应：

{
    "Credentials": {
        "Token": "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==",
        "Authenticated": true,
        "SecretKey": null
    },
    "Companies": [
        {
            "CustomerID": 2,
            "CompanyName": "Posworx",
            "CompanyLogo": "\\admin.loyaltyworx.co.za\\Images\\LOYALTY-LW.png",
            "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"
                },
                {
                    "StoreID": 3021,
                    "StoreNumber": null,
                    "StoreName": "Tes tStore",
                    "StoreAddress": "",
                    "StoreCity": "",
                    "StoreRegion": "",
                    "StoreCountry": ""
                },
                {
                    "StoreID": 3061,
                    "StoreNumber": null,
                    "StoreName": "tEST",
                    "StoreAddress": "",
                    "StoreCity": "Durban",
                    "StoreRegion": "",
                    "StoreCountry": ""
                }

            ]
        }
    ],
    "IsError": false,
    "ErrorMessage": null
}

public class Store
        {
            public class Credentials
            {
                public string Token { get; set; }
                public bool Authenticated { get; set; }
                public object SecretKey { get; set; }
            }

            public class StoreDetails
            {
                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 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; }
            }
        }

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

                client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
                client.DefaultRequestHeaders.Add("X-Giftworx-App", "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==");
                HttpResponseMessage response = await client.GetAsync(RestUrl);
                content = await response.Content.ReadAsStringAsync();

                JObject jsonResponse = JObject.Parse(content);
                JObject objResponse = (JObject)jsonResponse["Companies"];
                Dictionary<string, JArray> Items = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, JArray>>(objResponse.ToString());


                MainListView.ItemsSource = Items.ToList();
            }
            catch(Exception ex)
            {
                string exception = ex.Message;
            }


        }

类别：

{
    "Credentials": {
        "Token": "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==",
        "Authenticated": true,
        "SecretKey": null
    },
    "Companies": [
        {
            "CustomerID": 2,
            "CompanyName": "Posworx",
            "CompanyLogo": "\\admin.loyaltyworx.co.za\\Images\\LOYALTY-LW.png",
            "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"
                },
                {
                    "StoreID": 3021,
                    "StoreNumber": null,
                    "StoreName": "Tes tStore",
                    "StoreAddress": "",
                    "StoreCity": "",
                    "StoreRegion": "",
                    "StoreCountry": ""
                },
                {
                    "StoreID": 3061,
                    "StoreNumber": null,
                    "StoreName": "tEST",
                    "StoreAddress": "",
                    "StoreCity": "Durban",
                    "StoreRegion": "",
                    "StoreCountry": ""
                }

            ]
        }
    ],
    "IsError": false,
    "ErrorMessage": null
}

public class Store
        {
            public class Credentials
            {
                public string Token { get; set; }
                public bool Authenticated { get; set; }
                public object SecretKey { get; set; }
            }

            public class StoreDetails
            {
                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 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; }
            }
        }

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

                client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
                client.DefaultRequestHeaders.Add("X-Giftworx-App", "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==");
                HttpResponseMessage response = await client.GetAsync(RestUrl);
                content = await response.Content.ReadAsStringAsync();

                JObject jsonResponse = JObject.Parse(content);
                JObject objResponse = (JObject)jsonResponse["Companies"];
                Dictionary<string, JArray> Items = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, JArray>>(objResponse.ToString());


                MainListView.ItemsSource = Items.ToList();
            }
            catch(Exception ex)
            {
                string exception = ex.Message;
            }


        }

公共类存储
{
公共类凭据
{
公共字符串标记{get；set；}
公共布尔认证{get；set；}
公共对象SecretKey{get；set；}
}
公共类存储详细信息
{
public int StoreID{get；set；}
公共对象StoreNumber{get；set；}
公共字符串StoreName{get；set；}
公共字符串存储地址{get；set；}
公共字符串存储城市{get；set；}
公共字符串存储区域{get；set；}
公共字符串StoreCountry{get；set；}
}
公营公司
{
public int CustomerID{get；set；}
公共字符串CompanyName{get；set；}
公共字符串CompanyLogo{get；set；}
公共IList存储{get；set；}
}
公共类商店
{
公共凭据凭据{get；set；}
公共IList公司{get；set；}
公共布尔IsError{get；set；}
公共对象错误消息{get；set；}
}
}

请求：

{
    "Credentials": {
        "Token": "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==",
        "Authenticated": true,
        "SecretKey": null
    },
    "Companies": [
        {
            "CustomerID": 2,
            "CompanyName": "Posworx",
            "CompanyLogo": "\\admin.loyaltyworx.co.za\\Images\\LOYALTY-LW.png",
            "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"
                },
                {
                    "StoreID": 3021,
                    "StoreNumber": null,
                    "StoreName": "Tes tStore",
                    "StoreAddress": "",
                    "StoreCity": "",
                    "StoreRegion": "",
                    "StoreCountry": ""
                },
                {
                    "StoreID": 3061,
                    "StoreNumber": null,
                    "StoreName": "tEST",
                    "StoreAddress": "",
                    "StoreCity": "Durban",
                    "StoreRegion": "",
                    "StoreCountry": ""
                }

            ]
        }
    ],
    "IsError": false,
    "ErrorMessage": null
}

public class Store
        {
            public class Credentials
            {
                public string Token { get; set; }
                public bool Authenticated { get; set; }
                public object SecretKey { get; set; }
            }

            public class StoreDetails
            {
                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 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; }
            }
        }

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

                client.DefaultRequestHeaders.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json"));
                client.DefaultRequestHeaders.Add("X-Giftworx-App", "K6Zi8VXfqWuthxgn3YEfrU6Bj/EKM7BqvSZcatFgvMx408yadbE+Qj6IuTnZ++C9q4Ty1W2f1quNYMKZxFBNZg==");
                HttpResponseMessage response = await client.GetAsync(RestUrl);
                content = await response.Content.ReadAsStringAsync();

                JObject jsonResponse = JObject.Parse(content);
                JObject objResponse = (JObject)jsonResponse["Companies"];
                Dictionary<string, JArray> Items = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, JArray>>(objResponse.ToString());


                MainListView.ItemsSource = Items.ToList();
            }
            catch(Exception ex)
            {
                string exception = ex.Message;
            }


        }

public异步void LoadData（）
{
Store.Stores Store=新的Store.Stores（）；
尝试
{
var-content=“”；
HttpClient=新的HttpClient（）；
var RestUrl=“/api/Company/GetCustomerCompanies”；
client.BaseAddress=新Uri（RestUrl）；
client.DefaultRequestHeaders.Accept.Add（新的System.Net.Http.Headers.MediaTypeWithQualityHeaderValue（“应用程序/json”）；
client.DefaultRequestHeaders.Add（“X-Giftworx-App”、“K6Zi8VXfqWuthxgn3YEfrU6Bj/ekm7bqvszcatfgmx408yadbe+Qj6IuTnZ++c9q4ty1w2f1 qynmkzxfbnzg=”；
HttpResponseMessage response=wait client.GetAsync（RestUrl）；
content=wait response.content.ReadAsStringAsync（）；
JObject jsonResponse=JObject.Parse（内容）；
JObject objResponse=（JObject）jsonResponse[“公司”]；
Dictionary Items=Newtonsoft.Json.JsonConvert.DeserializeObject（objResponse.ToString（））；
MainListView.ItemsSource=Items.ToList（）；
}
捕获（例外情况除外）
{
字符串异常=例如消息；
}
}

您试图反序列化到这一行的字典中：

Dictionary<string, JArray> Items = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, JArray>>(objResponse.ToString()); 

Dictionary Items=Newtonsoft.Json.JsonConvert.DeserializeObject（objResponse.ToString（））；

尝试使用您创建的类：

var Items = Newtonsoft.Json.JsonConvert.DeserializeObject<Stores>(content);

var Items=Newtonsoft.Json.JsonConvert.DeserializeObject（内容）；

基于JSON对类进行建模可能会有问题。确保模型类与JSON完全一致，并检查相应的数据类型

下面是一个基于JSON字符串创建C#类的链接：

---

异步方法不应返回void。您不能等待它们，因此无法处理异常。另外，为什么不直接反序列化到

存储

？应该被反序列化对象更正。谢谢。此外，在VisualStudio中，您只需将JSON复制到剪贴板，然后进入“编辑>粘贴特殊内容>将JSON粘贴为类”