I'm having a problem deserializing a JSON file to an object, it's returning a JSON exception, here's my code:
class Program
{
static void Main(string[] args)
{
LoadJson(filePath);
}
public static void LoadJson(string filePath)
{
using (StreamReader r = new StreamReader(filePath))
{
string json = r.ReadToEnd();
List<Rootobject> items = JsonConvert.DeserializeObject<List<Rootobject>>(json);
}
}
}
public class Rootobject
{
public int total { get; set; }
public Value[] values { get; set; }
}
public class Value
{
public string name { get; set; }
public int count { get; set; }
public int previous_count { get; set; }
}
Here's the JSON file:
{
"total": 520738,
"values": [
{
"name": "2",
"count": 311326,
"previous_count": 11224
},
{
"name": "3",
"count": 73749,
"previous_count": 2747
},
{
"name": "4",
"count": 47810,
"previous_count": 1830
},
{
"name": "6",
"count": 20414,
"previous_count": 759
},
{
"name": "5",
"count": 14481,
"previous_count": 596
},
{
"name": "8",
"count": 7258,
"previous_count": 233
},
{
"name": "7",
"count": 6452,
"previous_count": 286
},
{
"name": "9",
"count": 4439,
"previous_count": 167
},
{
"name": "10",
"count": 4273,
"previous_count": 145
},
{
"name": "12",
"count": 2969,
"previous_count": 82
},
{
"name": "11",
"count": 1890,
"previous_count": 65
},
{
"name": "15",
"count": 1279,
"previous_count": 69
},
{
"name": "16",
"count": 1109,
"previous_count": 36
},
{
"name": "1",
"count": 1021,
"previous_count": 448
},
{
"name": "20",
"count": 906,
"previous_count": 68
},
{
"name": "18",
"count": 867,
"previous_count": 14
},
{
"name": "14",
"count": 844,
"previous_count": 58
},
{
"name": "13",
"count": 380,
"previous_count": 47
},
{
"name": "30",
"count": 376,
"previous_count": 9
},
{
"name": "40",
"count": 296,
"previous_count": 8
},
{
"name": "25",
"count": 282,
"previous_count": 2
},
{
"name": "17",
"count": 224,
"previous_count": 14
},
{
"name": "24",
"count": 188,
"previous_count": 23
},
{
"name": "23",
"count": 165,
"previous_count": 1
},
{
"name": "32",
"count": 157,
"previous_count": 0
},
{
"name": "28",
"count": 71,
"previous_count": 8
},
{
"name": "60",
"count": 48,
"previous_count": 2
},
{
"name": "39",
"count": 39,
"previous_count": 2
},
{
"name": "46",
"count": 29,
"previous_count": 0
},
{
"name": "22",
"count": 27,
"previous_count": 5
},
{
"name": "90",
"count": 24,
"previous_count": 0
},
{
"name": "21",
"count": 23,
"previous_count": 11
},
{
"name": "19",
"count": 20,
"previous_count": 0
},
{
"name": "26",
"count": 17,
"previous_count": 1
},
{
"name": "41",
"count": 16,
"previous_count": 0
},
{
"name": "33",
"count": 13,
"previous_count": 0
},
{
"name": "34",
"count": 10,
"previous_count": 4
},
{
"name": "35",
"count": 10,
"previous_count": 0
},
{
"name": "27",
"count": 9,
"previous_count": 4
},
{
"name": "43",
"count": 8,
"previous_count": 0
},
{
"name": "38",
"count": 8,
"previous_count": 0
},
{
"name": "81",
"count": 7,
"previous_count": 0
},
{
"name": "61",
"count": 6,
"previous_count": 0
},
{
"name": "76",
"count": 3,
"previous_count": 0
},
{
"name": "48",
"count": 3,
"previous_count": 3
},
{
"name": "140",
"count": 2,
"previous_count": 2
},
{
"name": "51",
"count": 2,
"previous_count": 0
},
{
"name": "55",
"count": 2,
"previous_count": 0
},
{
"name": "162",
"count": 1,
"previous_count": 0
},
{
"name": "120",
"count": 1,
"previous_count": 0
},
{
"name": "170",
"count": 1,
"previous_count": 1
},
{
"name": "145",
"count": 1,
"previous_count": 0
},
{
"name": "160",
"count": 1,
"previous_count": 0
},
{
"name": "29",
"count": 1,
"previous_count": 3
},
{
"name": "104",
"count": 1,
"previous_count": 0
},
{
"name": "235",
"count": 1,
"previous_count": 0
},
{
"name": "110",
"count": 1,
"previous_count": 0
},
{
"name": "42",
"count": 1,
"previous_count": 15
},
{
"name": "245",
"count": 1,
"previous_count": 0
},
{
"name": "275",
"count": 1,
"previous_count": 0
},
{
"name": "288",
"count": 1,
"previous_count": 0
},
{
"name": "Other",
"count": 17173,
"previous_count": 934
}
]
}
Tried changing the Value class to a List but still had the same issue. This is the returned exception:
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object. Path 'total', line 2, position 12.
Thanks!
CodePudding user response：
Your attached JSON is an object with Rootobject type, but not an array.
Deserialize as Rootobject.
Rootobject item = JsonConvert.DeserializeObject<Rootobject>(json);
While in naming conventions, we recommend using Pascal Casing for public members.
Modify all your properties to Pascal Case and apply the [JsonProperty] attribute to map the name of properties in JSON.
With [JsonProperty] attribute
public class Rootobject
{
[JsonProperty("total")]
public int Total { get; set; }
[JsonProperty("values")]
public Value[] Values { get; set; }
}
public class Value
{
[JsonProperty("name")]
public string Name { get; set; }
[JsonProperty("count")]
public int Count { get; set; }
[JsonProperty("previous_count")]
public int PreviousCount { get; set; }
}
Or With CamelCasePropertyNamesContractResolver
Rootobject item = JsonConvert.DeserializeObject<Rootobject>(json, new JsonSerializerSettings
{
ContractResolver = new CamelCasePropertyNamesContractResolver()
});