winfrom怎么解析这样的json

[yangjing6693]

{"message":"注册成功！","success":true,"code":null,"text":null}

[智商余额不足]

using System.Runtime.Serialization.Json;

var json = new DataContractJsonSerializer(typeof(Msg));
var str = "{\"message\":\"注册成功！\",\"success\":true,\"code\":null,\"text\":null}";
var obj = (Msg)json.ReadObject(new MemoryStream(Encoding.Unicode.GetBytes(str)));
Console.WriteLine(obj.message);
Console.WriteLine(obj.success);
Console.WriteLine(obj.code);
Console.WriteLine(obj.text);

public class Msg
{
    public string message { get; set; }
    public bool success { get; set; }
    public string code { get; set; }
    public string text { get; set; }
}

[冬冬冬冬冬冬冬冬冬冬]

。net有josn类库，没事的。