CODEWITHSUNDEEP
c#serializationjson.net
WilliamW
WilliamW

Reputation: 468

Deserialize a List<T> json.net in C#

I am a new user of Json.NET. I have created a type: Person that has different attributes: firstName, lastName, age, etc.

I have a Json string but I can't manage to deserialize it and get all the "Person" in a stored list.

Here is my piece of code I am running:

List <Person> persons = JsonConvert.DeserializeObject<List<Person>>(strPersons);`

strPersons is my json string. It is like that:

string strPersons = @"{
    'Columns':['FirstName','LastName','Hobbies','Age','Country','Address','Phone','Gender'],
    'Rows':[ 
       ['X', 'Y', 'Cuisine', '35', 'France', 'unknown', 'unknown', 'male'],      
       ['W', 'Z', 'Danser', '43', 'France', 'unknown', 'unknown', 'male'],
        ...]

My error when compiling is:

Additional information: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type System.Collections.Generic.List1[Info3JsonConvertor.Person]' because the type requires a JSON array

Can someone explain me how can I deserialize my json string to get a list Will I have the same problem if I serialize a List<Person> into json string?
I know those questions have already been answered but if someone can explain me with my example?

Upvotes: 0

Views: 2284

Answers (2)

EZI
EZI

Reputation: 15364

Your root element is an object not a list or array ({....}). Json arrays start with [

public class MyData
{
    public List<string> Columns { set; get; }
    public List<List<string>> Rows { set; get; }
}

var data = JsonConvert.DeserializeObject<MyData>(json);

Upvotes: 0

Felix Av
Felix Av

Reputation: 1254

The object that the deserializer recognizes from your JSON looks something like that:

public class RootObject
{
    public List<string> Columns { get; set; }
    public List<List<string>> Rows { get; set; }
}

As you can see it's not List, but just Person

Upvotes: 1

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