How to convert Json type with array to .net object?

Question

I have JSON string: // the coverage value is an array.

  string jsonData = @"{
""plans"":
[
{
""plan_code"":""UL500"",
    ""plan_name"":""Unlimited 500M"",
    ""days"":1,
    ""limit"":500,
    ""coverage"":
[
{
""country"":""SE"",
},
{
""country"":""BZ""
}
]
},
{
""plan_code"":""UL1GB"",
    ""plan_name"":""Unlimited 1GB"",
    ""days"":1,
    ""limit"":1024,
    ""coverage"":
[
{
""country"":""SG"",
},
{
""country"":""JP""
}
]
}
]
}
";

and i'm parse by JsonConvert.DeserializeObject as sample code below:

 try
    {
        var content = new StringContent(jsonData, Encoding.UTF8, "application/json");
        HttpResponseMessage response = await client.PostAsync("", content);
        var result = await response.Content.ReadAsStringAsync();
        var tempRecords = JsonConvert.DeserializeObject<List<plan>>(result);
    }

and then i'm get an error message: "Cannot deserialize the current JSON object (e.g. {\"name\":\"value\"}) into type 'System.Collections.Generic.List`1[DAL.plan]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.\r\nTo 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.\r\nPath 'plans', line 1, position 9."

please show me a right way for this issue.

looks like a duplicate to stackoverflow.com/questions/33427579/… — MJ Khan
– MJ Khan, Commented Jul 6, 2017 at 4:03

Sujith · Accepted Answer · 2017-07-06 03:45:26Z

Here is the working code with the same JSON, from my console app:

public class Program
{
    static void Main(string[] args)
    {
        string jsonData = "{\"plans\":[{\"plan_code\":\"UL500\",\"plan_name\":\"Unlimited 500M\",\"days\":1,\"limit\":500,\"coverage\":[{\"country\":\"SE\"},{\"country\":\"BZ\"}]},{\"plan_code\":\"UL1GB\",\"plan_name\":\"Unlimited 1GB\",\"days\":1,\"limit\":1024,\"coverage\":[{\"country\":\"SG\"},{\"country\":\"JP\"}]}]}";

        var tempRecords = JsonConvert.DeserializeObject<RootObject>(jsonData);

    }
}

public class RootObject
{
    public List<plan> plans { get; set; }
}

public class plan
{
    public string plan_code { get; set; }
    public string plan_name { get; set; }
    public int days { get; set; }
    public int limit { get; set; }
    public IList<Country> coverage { get; set; }
}

public class Country
{
    public string country { get; set; }
}

I have created C# classes that suits your JSON structure. As a note, I have modified the JSON you provided, as it seems to be not in the correct format.

Thank you very much! string jsonData in my case in fact is dynamic data, the sample code you give me work well
@MaiTrọngThànhSEOMaster Please mark as answer if this was helpful to solve your issue.

derekb · Accepted Answer · 2017-07-06 03:26:09Z

0

The whole string represents an object with a property called "plans" that refers to your array. The string itself is not the array, so if you're trying to deserialize it as a List<T>, that's not going to work. You need to handle the fact that your desired array is wrapped by a JSON object.

This is a similar problem that I think explains it well.

answered Jul 6, 2017 at 3:26

derekb

11 silver badge1 bronze badge

Comments

luyee · Accepted Answer · 2017-07-06 03:40:02Z

0

The entity corresponding to the JSON format does not match. Your format is an object, and the object has an array of attributes, not List

answered Jul 6, 2017 at 3:40

luyee

12 bronze badges

Comments

Mayur Shah · Accepted Answer · 2017-07-06 05:59:25Z

Hello，I have just looked at your question, I found that you provided the json string, not the standard format json string. Here I am giving me a good json string, you can try it out。

{
    "plans": [`enter code here`
        {
            "plan_code": "UL500",
            "plan_name": "Unlimited500M",
            "days": 1,
            "limit": 500,
            "coverage": [
                {
                    "country": "SE"
                },
                {
                    "country": "BZ"
                }
            ]
        },
        {
            "plan_code": "UL1GB",
            "plan_name": "Unlimited1GB",
            "days": 1,
            "limit": 1024,
            "coverage": [
                {
                    "country": "SG"
                },
                {
                    "country": "JP"
                }
            ]
        }
    ]
}

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