Question

我目前正在使用xamarin和abp样板做一个小项目。我试图使用Xamarin从我的服务器获取数据。我已设法登录并接收令牌。当我尝试反序列化对象时，它返回一个错误返回

Newtonsoft.Json.JsonSerializationException：无法反序列化当前的JSON对象（例如{＆＃34; name＆＃34;：＆＃34; value＆＃34;}）到类型＆＃39; System.Collections.Generic.List`1 [MobileUI.Models.User]＆＃39;因为 type需要一个JSON数组（例如[1,2,3]）才能正确反序列化。至修复此错误要么将JSON更改为JSON数组（例如[1,2,3]）或更改反序列化类型，使其成为正常的.NET类型（例如不是像整数这样的原始类型，不是像数组那样的集合类型或者List）可以从JSON对象反序列化。 JsonObjectAttribute也可以添加到类型中以强制它从JSON对象反序列化。路径＆＃39;结果＆＃39;，第1行，第10位。

这是GetUserAsync的代码

public async Task<List<User>> GetUserAsync(string accessToken)
{
    var client = new HttpClient();
    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);

    var json = await client.GetStringAsync("http://serverurl/testrun/api/services/app/user/GetRoles");

    var users = JsonConvert.DeserializeObject<List<User>>(json);

    return users;
}

这是型号代码

public class User
{
    [JsonProperty("items")]
    public Item[] Items { get; set; }
}

public partial class Item
{
    [JsonProperty("name")]
    public string Name { get; set; }

    [JsonProperty("displayName")]
    public string DisplayName { get; set; }

    [JsonProperty("description")]
    public string Description { get; set; }

    [JsonProperty("isStatic")]
    public bool IsStatic { get; set; }

    [JsonProperty("permissions")]
    public string[] Permissions { get; set; }

    [JsonProperty("id")]
    public int Id { get; set; }
}

我在var users = JsonConvert.DeserializeObject<List<User>>(json);

处设了一个断点

显然，错误来自这里。任何帮助表示赞赏。

编辑：忘了添加API的响应主体

{
  "result": {
    "items": [
      {
        "name": "Admin",
        "displayName": "Admin",
        "description": null,
        "isStatic": true,
        "permissions": [
          "Pages.Users",
          "Pages.Roles",
          "Pages.Tenants"
        ],
        "id": 1
      },
      {
        "name": "Tenants",
        "displayName": "Tenants",
        "description": "",
        "isStatic": false,
        "permissions": [
          "Pages.Tenants",
          "Pages.Users"
        ],
        "id": 12
      },
      {
        "name": "Landlord",
        "displayName": "Landlord",
        "description": "",
        "isStatic": false,
        "permissions": [
          "Pages.Tenants",
          "Pages.Property",
          "Pages.Payment",
          "Pages.Feedback",
          "Pages.Document",
          "Pages.LandLord",
          "Pages.Users"
        ],
        "id": 14
      },
      {
        "name": "User",
        "displayName": "Users",
        "description": "",
        "isStatic": false,
        "permissions": [
          "Pages.Property",
          "Pages.Payment",
          "Pages.Feedback",
          "Pages.Document"
        ],
        "id": 20
      }
    ]
  },
  "targetUrl": null,
  "success": true,
  "error": null,
  "unAuthorizedRequest": false,
  "__abp": true
}

编辑2：忘记添加UserViewModel.cs

private List<Item> _users;

//public string AccessToken { get; set; }
public List<Item> Users
{
    get { return _users; }
    set
    {
        _users = value;
        OnPropertyChanged();
    }
}
public ICommand GetUsersCommand
{
    get
    {
        return new Command(async () =>
        {
            var accessToken = Settings.AccessToken;
            Users = await _apiServices.GetUserAsync(accessToken);
        });
    }
}

Answer 1

根据您的json，它包含from bson import ObjectId db.collection.update_many({"_id" : ObjectId("5a95a1c32a2e2e0025e6d6e2")}, {"status": "submission"}) List个items对象，并且您正在反序列化User对象的列表

您应该从json获取result对象，然后您将获得项目列表

var user = JsonConvert.DeserializeObject<User>(json);
var items = user.result.Items;

你的模型应该是这样的

class User{
    [JsonProperty("result")]
    public Result result { get; set; }
}

class Result{
    [JsonProperty("items")]
    public Item[] Items { get; set; }
}

Answer 2

我试过这个并且它有效！检查一下：

public class Item
{
  public string name { get; set; }
  public string displayName { get; set; }
  public string description { get; set; }
  public bool isStatic { get; set; }
  public List<string> permissions { get; set; }
  public int id { get; set; }
 }

 public class Result
 {
   public List<Item> items { get; set; }
 }

 public class RootObject
 {
   public Result result { get; set; }
   public object targetUrl { get; set; }
   public bool success { get; set; }
   public object error { get; set; }
   public bool unAuthorizedRequest { get; set; }
   public bool __abp { get; set; }
 }

然后我就这样称呼它：

var json = "{\"result\":{\"items\":[{\"name\":\"Admin\",\"displayName\":\"Admin\",\"description\":null,\"isStatic\":true,\"permissions\":[\"Pages.Users\",\"Pages.Roles\",\"Pages.Tenants\"],\"id\":1},{\"name\":\"Tenants\",\"displayName\":\"Tenants\",\"description\":\"\",\"isStatic\":false,\"permissions\":[\"Pages.Tenants\",\"Pages.Users\"],\"id\":12},{\"name\":\"Landlord\",\"displayName\":\"Landlord\",\"description\":\"\",\"isStatic\":false,\"permissions\":[\"Pages.Tenants\",\"Pages.Property\",\"Pages.Payment\",\"Pages.Feedback\",\"Pages.Document\",\"Pages.LandLord\",\"Pages.Users\"],\"id\":14},{\"name\":\"User\",\"displayName\":\"Users\",\"description\":\"\",\"isStatic\":false,\"permissions\":[\"Pages.Property\",\"Pages.Payment\",\"Pages.Feedback\",\"Pages.Document\"],\"id\":20}]},\"targetUrl\":null,\"success\":true,\"error\":null,\"unAuthorizedRequest\":false,\"__abp\":true}";

var user = JsonConvert.DeserializeObject<RootObject>(json);

Answer 3

我认为你的问题是数据绑定的方式，你可以尝试双向绑定或Oneway绑定。您参考此documentation。

无法反序列化JSON对象

3 个答案: