DadJokesAPI.sh

$ curl -s https://icanhazdadjoke.com/

DadJokeService.cs

using System;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace JokesAPI
{
    public class DadJokeService
    {
        private readonly HttpClient client;

        public DadJokeService()
        {
            client = new HttpClient();
            client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
            client.BaseAddress = new Uri("https://icanhazdadjoke.com");
        }

        public string GetRandomJoke()
        {
            HttpResponseMessage response = client.GetAsync("/").Result;
            if (response.IsSuccessStatusCode)
            {
                string jsonResponse = response.Content.ReadAsStringAsync().Result;
                JokeResponse jokeResponse = JsonSerializer.Deserialize<JokeResponse>(jsonResponse);
                return jokeResponse.Content;
            }
            else
            {
                throw new HttpRequestException(string.Format("{0} ({1})", response.StatusCode, response.ReasonPhrase));
            }
        }


        private class JokeResponse
        {
            [JsonPropertyName("joke")]
            public string Content { get; set; }

            [JsonPropertyName("id")]
            public string Id { get; set; }

            [JsonPropertyName("status")]
            public int Status { get; set; }
        }
    }
}