json.net C＃集合序列化

Question

I have to build a JSON data that looks like the below. I am using JSON.net in C# to build the structure. { "username":"xxxx", "password":"yyyy", "inputs" : [ { "name" : "cccc" }, { "name" : "dddd" } ] }

The C# code looks like this.

    **public string MethodName(ref rdServerObjects rdObjects)
    {
        RootObject preJsonData = new RootObject();

        List<Input> inputs = new List<Input>();
        Input input = new Input();
        preJsonData.username = "xxxx";
        preJsonData.password = "yyyy";
        input.name = "cccc";
        inputs.Add(input);
        input.name = "dddd";
        inputs.Add(input);
        string postJsonData = JsonConvert.SerializeObject(preJsonData);
        return postJsonData;
    }
}
public class RootObject
{
    public string username { get; set; }
    public string password { get; set; }
    public List<Input> inputs { get; set; }
}
public class Input
{
    public string name { get; set; }
}**

When my code executes, the output comes as:

{"username":"xxxx","password":"yyyy","inputs":null}

Can someone please tell me what is wrong with my code? All help would be greatly appreciated.

thanks

Answer 1

preJsonData.inputs = inputs ... The list you are creating in your MethodName is not at all connected to the list inside your preJsonData .

public string MethodName(ref rdServerObjects rdObjects)
{
        RootObject preJsonData = new RootObject();

        List<Input> inputs = new List<Input>();
        Input input = new Input();
        preJsonData.username = "xxxx";
        preJsonData.password = "yyyy";
        input.name = "cccc";
        inputs.Add(input);
        input = new Input();    //Add this line to keep from overwriting first
        input.name = "dddd";
        inputs.Add(input);

        //THIS LINE
        preJsonData.inputs = inputs;

        string postJsonData = JsonConvert.SerializeObject(preJsonData);
        //string postJsonData = new JavaScriptSerializer().Serialize(preJsonData);
        return postJsonData;
    }
}

Answer 2

You didn't set the inputs property of preJsonData .

    List<Input> inputs = new List<Input>();
    Input input = new Input();
    preJsonData.username = "xxxx";
    preJsonData.password = "yyyy";
    input.name = "cccc";
    inputs.Add(input);
    input.name = "dddd";
    inputs.Add(input);
    preJsonData.inputs = inputs; //<-- this bad boy
    string postJsonData = JsonConvert.SerializeObject(preJsonData);
    //string postJsonData = new JavaScriptSerializer().Serialize(preJsonData);
    return postJsonData;

Answer 3

As Phiter & Ron have mentioned, you didn't set the inputs property of preJsonData .

One more part you are missing is, not re-initialising the input variable before setting its name . This will result in you getting “dddd” in your response.

Input input = new Input();
input.name = "cccc";
inputs.Add(input);
input = new Input();
input.name = "dddd";
inputs.Add(input);
preJsonData.inputs = inputs;

This would fix your code.