CODEWITHSUNDEEP
c#.netjsonxamarindatacontract
Mark Evans
Mark Evans

Reputation: 37

Deserialize JSON with empty string key

These are the data contract class and attributes below.

public partial class ValidationErrors
{

    [System.Runtime.Serialization.DataMemberAttribute()]
    public string Message;

    [System.Runtime.Serialization.DataMemberAttribute()]
    public ModelState ModelState;
}

[System.Runtime.Serialization.DataContractAttribute()]
public partial class ModelState
{   
    [System.Runtime.Serialization.DataMemberAttribute()]
    public string[] empty;
}

This is the JSON code where I'm getting the issue and is after the "ModelState" where no field name is given.

How do I create data Contract classes to reflect the JSON below?

 {"Message":"The request is invalid.","ModelState":{"":["Some messege is being displayed"]}}

EDIT Code to proccess deserialization:

Stream res= await response.Content.ReadAsStreamAsync();
var x = await response.Content.ReadAsStringAsync();
object result= ModelStateSerializer.ReadObject(res);

Upvotes: 1

Views: 859

Answers (1)

Nkosi
Nkosi

Reputation: 247123

Using the following class structure

public partial class ValidationErrors {
    public string Message { get; set; }
    public ModelState ModelState { get; set; }
}

public partial class ModelState : Dictionary<string, List<string>> {

}

The following example demonstrates how to use Json.Net to generate the desired JSON described in the original question.

public static void Main()
{
    var errors = new ValidationErrors {
        Message = "The request is invalid.",
        ModelState = new ModelState {
            { "", new List<string>(){"Some messege is being displayed"} }   
        }
    };

    var json = JsonConvert.SerializeObject(errors);

    Console.WriteLine(json);
}

Output:

{"Message":"The request is invalid.","ModelState":{"":["Some messege is being displayed"]}}

The output JSON is able to be deserialized to the same class structure used in the serialization.

The following example reads the content of a response and converts it to the desired type.

var json = await response.Content.ReadAsStringAsync();
var errors = JsonConvert.DeserializeObject<ValidationErrors>(json);
var message = errors.Message;
var modelState = errors.ModelState;
var details = modelState[""].FirstOrDefault();

Upvotes: 1

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