Json用2个数组反序列化字符串

Question

I have to Serialize a string with two list collections as JSON string.

 public class Product {
   public string  Name {get;set;}
 };

 public class Product2 {
   public string Age { get; set; }
 };

 private void Form1_Load(object sender, EventArgs e) {
   List<Product> mitems = new List<Product>();
   List<Product2> mitems2 = new List<Product2>();
   mitems.Add(new Product { Name = "John" });
   mitems2.Add(new Product2 {Age = "28" } );
   var objects = new { mitems, mitems2 };

   string json = JsonConvert.SerializeObject(objects);
   var Items = JsonConvert.DeserializeObject<List<Product>>(json);
 }

In the last line, I am getting an exception Cannot deserialize the current JSON object

Answer 1

Instead of an anonymous object probably you would want to create a model to hold this like

public class MyModel
{
  public List<Product> products { get; set; }
  public List<Product2> products2 { get; set; }
}

In Form_Load

MyModel model = new MyModel
{
  Products = mitems,
  Products2 = mitems2,
}

var Items = JsonConvert.DeserializeObject<MyModel>(json);

per your comment, if you want to iterate through Products then

foreach(var data in Item.products)
{
  MessageBox.Show(data.Name);
}

Answer 2

You can't deserialise objects to a List<Product> because it isn't a List<Product> it's a new anonymous type with two properties

Change

 var objects = new { mitems, mitems2 };

To

 var objects = new List<Product>(mitems);
 objects.AddRange(mitems2);

Also Product2 is not a product

You also need to change

 public class Product2

To

 public class Product2 : Product

in order to add it to a list of Product

Answer 3

You have several options, one is you can deserialize as dynamic or you can define a root object for your final json.

var Items = JsonConvert.DeserializeObject<dynamic>(json);

and casting to your object lists:

List<Product> products = new List<Product>();
List<Product2> products2 = new List<Product2>();

foreach (var item in Items.mitems)
{
    Console.WriteLine(item.Name);
    products.Add(((JObject)item).ToObject<Product>());
}

foreach (var item2 in Items.mitems2)
{
    Console.WriteLine(item2.Age);
    products2.Add(((JObject)item2).ToObject<Product2>());
}

output :

John
28

or

class RootObj
{
    public List<Product> mitems { get; set; }
    public List<Product2> mitems2 { get; set; }
}

var Items = JsonConvert.DeserializeObject<RootObj>(json);

foreach (var item in Items.mitems)
{
    Console.WriteLine(item.Name);
}

foreach (var item2 in Items.mitems2)
{
    Console.WriteLine(item2.Age);
}

output:

John
28

Outputs for both deserialization methods:

Answer 4

you can also do this:

using Newtonsoft.Json.Linq;

var item = JsonConvert.DeserializeObject<IDictionary<string, object>>(json)["mitems"];
Console.WriteLine(((JArray)item).ToObject<IList<Product>>());

Edit: I rephrased my answer

Fiddler Example : https://dotnetfiddle.net/ItMClb