questions/47923402/deserializing-rest-resource-to-generic-object

CSharp · Console

/Program.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization.Formatters;
using System.IO;
using System.Data;
using System.ComponentModel.DataAnnotations;
using System.Globalization;

    // https://stackoverflow.com/questions/47923402/deserializing-rest-resource-to-generic-object
    using SimpleJson;
    using RestSharp;

    public abstract class PostalAddressOccupancy
    {
        public DateTime EffectiveDate { get; set; }
        public DateTime EndDate { get; set; }
        public string EntityType { get; set; }
        public string Href { get; set; }
        public string Id { get; set; }
        public bool IsCorrespondenceAddress { get; set; }
        public PostalAddress PostalAddress { get; set; }
        public string PostalAddressType { get; set; }

        public abstract object GetOccupant();
    }

    public class PostalAddressOccupancy<T> : PostalAddressOccupancy
    {
        public T Occupant { get; set; }

        public override object GetOccupant()
        {
            return Occupant;
        }
    }

    public class PostalAddress
    {
        // Or whatever.  Type was not included in the question.
        public string Address { get; set; }
    }

    public class Student
    {
        public string Name { get; set; }
        public string StudentId { get; set; }
    }

    public class Staff
    {
        public string Name { get; set; }
        public string StaffId { get; set; }
    }

    public static class PostalAddressOccupancyExtensions
    {
        public static PostalAddressOccupancy DeserializePostalAddressOccupancy(this RestSharp.IRestResponse response)
        {
            var addressObj = (JsonObject)SimpleJson.SimpleJson.DeserializeObject(response.Content);
            var type = PostalAddressOccupancyExtensions.InferPostalAddressOccupancyType(addressObj);
            return (PostalAddressOccupancy)SimpleJson.SimpleJson.DeserializeObject(response.Content, type);
        }

        static Type InferPostalAddressOccupancyType(JsonObject root)
        {
            var occupantObj = root["Occupant"];
            if (occupantObj is JsonObject)
            {
                var occupant = (JsonObject)occupantObj;
                // Add logic to recognize other cases as required.
                if (occupant.ContainsKey("StudentId"))
                {
                    return typeof(PostalAddressOccupancy<Student>);
                }
                else if (occupant.ContainsKey("StaffId"))
                {
                    return typeof(PostalAddressOccupancy<Staff>);
                }
            }
            // Or throw an exception, if you prefer.
            return typeof(PostalAddressOccupancy<>).MakeGenericType(new[] { occupantObj.GetType() });
        }
    }

    class TestClass
    {
        public static void Test()
        {
            Console.WriteLine("RestSharp version: " + typeof(RestResponse).Assembly.FullName);
            Console.WriteLine();

            Test(new Staff { Name = "my name", StaffId = "222" });
            Test(new Student { Name = "some kid", StudentId = "-121" });
        }

        static void Test<T>(T occupant)
        {
            var address = new PostalAddressOccupancy<T>
            {
                EffectiveDate = new DateTime(2016, 2, 2),
                EndDate = new DateTime(2020, 2, 2),
                EntityType = "foo",
                Href = "http://foo",
                Id = "1010101",
                IsCorrespondenceAddress = true,
                PostalAddress = new PostalAddress { Address = "po box here" },
                PostalAddressType = "po box",
                Occupant = occupant,
            };

            var json = Newtonsoft.Json.JsonConvert.SerializeObject(address, Newtonsoft.Json.Formatting.Indented);
            Console.WriteLine("\nInput JSON: ");
            Console.WriteLine(json);

            RestSharp.RestResponse response = new RestSharp.RestResponse();
            response.Content = json;
            response.ContentType = "application/json";

            var address2 = response.DeserializePostalAddressOccupancy();

            Assert.IsTrue(address.GetOccupant().GetType() == address2.GetOccupant().GetType());

            var json2 = Newtonsoft.Json.JsonConvert.SerializeObject(address2, Newtonsoft.Json.Formatting.Indented);

            Console.WriteLine("\nDeserialized and re-serialized {0}:", address);
            Console.WriteLine(json2);
        }
    }

	public class Program
	{
		public static void Main()
		{
			Console.WriteLine("Environment version: " + Environment.Version);
			//Console.WriteLine("Json.NET version: " + typeof(Newtonsoft.Json.JsonSerializer).Assembly.FullName);
			Console.WriteLine("RestSharp version: " + typeof(RestResponse).Assembly.FullName);
			Console.WriteLine();

			try
			{
				TestClass.Test();
			}
			catch (Exception ex)
			{
				Console.WriteLine("Failed with unhandled exception: ");
				Console.WriteLine(ex);
				throw;
			}
		}
	}

    public class AssertionFailedException : System.Exception
    {
        public AssertionFailedException() : base() { }

        public AssertionFailedException(string s) : base(s) { }
    }

    public static class Assert
    {
        public static void IsTrue(bool value)
        {
            IsTrue(value, "failed");
        }

        public static void IsTrue(bool value, string message)
        {
            if (value == false)
                throw new AssertionFailedException(message ?? "failed");
        }
    }