Question

我需要反序列化一些JSON，但问题是我的所有JSON对象都没有完全相同的格式。以下是我必须反序列化的JSON示例：

[
  {
    "Player_Name": "Zlatan Ibrahimovic",
    "Country": "Sweeden",
    "Other_Informations": {
      "Information1": [

      ]
    },
  },
   {
    "Player_Name": "Pavel Nedved",
    "Country": "Czech Republic",
    "Personal_Honours": 
        {
            "Ballon_DOr": "One",
        },
    "Other_Informations": {
      "Information1": [

      ]
    },
  },
   {
    "Player_Name": "Zinedine Zidane",
    "Country": "Sweeden",
    "Other_Informations": {
      "Information1": [
        {
          "name": "example",
        }
      ]
    },
  }
 ]

如您所见，某些字段仅出现在某些对象中，例如“Personal_Honours”。我需要将JSON反序列化到这个类中：

public class PlayerData
{
    public string Name { get; set; }
    public string BallonDor {get; set; }
    public string Information1{ get; set; }
    public string Country{ get; set; }
}

我使用这个非常长的方法并阻止我的应用：（在这个例子中，我使用Json来自文本文件但通常我必须发出REST请求..）

StreamReader reader = File.OpenText("TextFile1.txt");
List<PlayerData> DataList;
dynamic value= JsonConvert
    .DeserializeObject<dynamic>(reader.ReadToEnd());


DataList = new List<PlayerData>();
    foreach (dynamic data in value)
                    {

                        if (data.Personal_Honours == null)
                        {
                            if (data.Other_Informations.Information1 == null)
                            {
                                DataList.Add(new PlayerData
                                {
                                    Name = data.Player_Name,
                                    Country = data.Country,
                                });
                            }
                            else                            
                            {
                                DataList.Add(new PlayerData
                                {
                                    Name = data.Player_Name,
                                    Country = data.Country,
                                    Information1 = data.Informations.Information1
                                });

                            }

                        }
                        else 
                        {
                            if (data.Other_Informations.Information1 == null)
                            {

                                DataList.Add(new PlayerData
                                {
                                    Name = data.Player_Name,
                                    Country = data.Country,
                                    BallonDor = data.Personal_Honours.Ballon_DOr

                                });
                            }
                            else 
                            {
                                DataList.Add(new PlayerData
                                {
                                    Name = data.Player_Name,
                                    Country = data.Country,
                                    BallonDor = data.Personal_Honours.Ballon_DOr,
                                    Information1 = data.Informations.Information1

                                });

                            }

                        }

                    }

此方法正在运行，但效率不高并阻止了我的UI。如何创建一个新的“PlayerData”对象而不包含所有那些“else if”语句？谢谢！

P.S：问题与此Filter JSon Information

不同

编辑：

以下是我如何获得RunTimeBinderExcepetion：

 List<PlayerData> datalist = new List<PlayerData>();

    foreach (dynamic pl in timeline)
    {



        datalist.Add(new PlayerData 
        { 

         Name  = pl.Player_Name , 
         Country = pl.Country ,
          BallonDor = pl.Personal_Honours.Ballon_Dor,
           Information1 = pl.Other_Informations.Information1.name

        });
    }

Answer 1

你有例外，因为有些数据没有Personal_Honours属性。然后，您尝试从引发异常的Ballon_Dor引用访问null属性。这种方式适用于您发布的示例JSON：

List<PlayerData> datalist = new List<PlayerData>();
foreach (dynamic pl in timeline)
{
    //object initialization is done later just for the sake of easier debugging
    //...so we can spot unexpected data which cause exception easily
    var Name = pl.Player_Name;
    var Country = pl.Country;
    var BallonDor = pl.Personal_Honours != null ? pl.Personal_Honours.Ballon_Dor : null;
    var Information1 = pl.Other_Informations.Information1.Count > 0 ? 
                                pl.Other_Informations.Information1[0].name : 
                                null;
    datalist.Add(new PlayerData 
    { 
        Name  = Name , 
        Country = Country ,
        BallonDor = BallonDor,
        Information1 = Information1
    });
}

...但是上述方法仍然容易出错，具体取决于我们拥有的JSON字符串的一致性。更强大的方法可能是让模型类映射JSON字符串，如@L.B在评论中所建议的那样。

动态选择所需的JSON信息

1 个答案: