Csharp 向嵌套 JSON 文档中的数组添加新对象

免责声明:C#并不是我的强项，伙计们；我通常是个数据库专家.其中很多都是我在这里和那里找到的代码拼凑而成的；所以请对我宽容一些.

我正在try 弄清楚如何向用户打开的现有JSON文档添加新对象，然后保存对该文件的更新.下面是一个编成的JSON，遵循相同的基本 struct ，我希望能够添加一个新的"汽车"到"人"."新"值通过文本框和下拉列表出现.

{
  "Name": "Bob Bob",
  "City": "Louisville",
  "State": "Kentucky",
  "Address": "123 City Ln",
  "Cars": [
    {
      "Make": "Ford",
      "Model": "Explorer",
      "Color": "White"
    },
    {
      "Make": "Dodge",
      "Model": "Caravan",
      "Color": "White"
    },
    {
      "Make": "Bat",
      "Model": "Mobile",
      "Color": "Black:"
    }
  ],
  "Jobs": [
    {
      "Employer": "Walmart",
      "Position": "Greeter",
      "Pay": "$35,000",
      "EndDate": "12/25/1999"
    },
    {
      "Employer": "Target",
      "Position": "Cashier",
      "Pay": "$32,000",
      "EndDate": "1/1/2002"
    },
    {
      "Employer": "SkyNet",
      "Position": "Programmer",
      "Pay": "$86,000",
      "EndDate": "5/8/2023"
    }
  ]
}

我已经设置了以下班级

public class Person
{
    public string Name { get; set;}
    public string City { get; set;}
    public string State { get; set;}
    public string Address { get; set;}
    public Cars[] Cars {get; set;}
    public Jobs[] Jobs {get; set;}
}

public class Cars
{
    public string Make { get; set;}
    public string Model { get; set;}
    public string Color { get; set;}
}

public class Jobs
{
    public string Employer { get; set;}
    public string Position { get; set;}
    public string Pay { get; set;}
    public string EndDate { get; set;}
}

以下是我到目前为止拥有的代码

private void btnSaveUpdates_Click(object sender, EventArgs e)
{
    string Make = cbMake.Text;
    string Model = txtModel.Text;
    string Color = cbColor.Text;
    string filePath = txtFileLoc.Text;

    DoJSONWork(filePath, Make, Model, Color);
}

public static void DoJSONWork(string filePath, string Make, string Model, string Color)
{
    var FileStream = File.OpenRead(filePath);

    using (StreamReader reader = new StreamReader(FileStream))
    {
        using (JsonTextReader JSONreader = new JsonTextReader(reader))
            {
                JSONreader.SupportMultipleContent = true;

                var serializer = new JsonSerializer();
                while (JSONreader.Read())
                {
                    if (JSONreader.TokenType == JsonToken.StartObject)
                    {
                        Person p = serializer.Deserialize<Person>(JSONreader);

                        Cars cars = p.Cars.FirstOrDefault(c => c.Make + c.Model + c.Color == Make + Model + Color);
                        if (cars == null)
                        {
                            cars = new Cars
                            {
                                Make = Make,
                                Model = Model,
                                Color = Color
                            };
                            p.Cars = p.Cars.Concat(new Cars[]
                            {
                              cars
                            }).ToArray();

                        }

                    }
                }
            }
        }

        //I honestly don't know what to do next 
    }

我正在努力想办法更新JSON文档中的"汽车".我需要反序列化和序列化整个JSON文档吗？