C# sample application for interacting with the DataRobot REST API (V2).

DataRobotV2ApiAutopilotDemo.cs

// This is an example of a C# application that uploads a CSV dataset to DataRobot,
// runs a classification project in autopilot mode and prints the leaderboard
// using the V2 REST API. Here you can also see an example of interacting with the
// asynchronous API routes (upload project, set target).

// Since the WebClient class has limited HTTP functionality, we use the newer
// Microsoft.Net.Http.HttpClient class. Its methods are async; as a result,
// the C# code uses asynchronous operations too.

// You may need to install the following packages for this code to work:
// * Newtonsoft.Json (aka Json.NET)
// * Microsoft.Net.Http
// * Microsoft.CSharp

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using Newtonsoft.Json;

namespace DataRobotV2ApiAutopilotDemo
{
    class Program
    {
        private static string apiRootUrl = "https://app.datarobot.com/api/v2";
        private static string apiToken = "token1234567890abcdef";
        private static string dataset = "/path/to/dataset.csv";
        private static string target = "targetColumnName";

        private static TimeSpan AsyncPingDelay = TimeSpan.FromSeconds(5);

        private static async Task PrintHttpError(HttpResponseMessage response)
        {
            Console.WriteLine($"ERROR! HTTP code {(int)response.StatusCode}, content: {await response.Content.ReadAsStringAsync()}");
        }

        private static async Task<string> WaitForAsyncResolution(HttpClient client, string url)
        {
            Console.WriteLine($"Waiting for job {url} to complete...");
            while (true)
            {
                var response = await client.GetAsync(url);
                Console.Write($"Job status code: {(int)response.StatusCode}");
                if (response.StatusCode == HttpStatusCode.SeeOther)
                {
                    var resultLocation = response.Headers.GetValues("Location").First();
                    Console.WriteLine($" - job complete, resolved to {resultLocation}");
                    return resultLocation;
                }
                else
                {
                    Console.WriteLine(" - not done yet, will check later");
                    await Task.Delay(AsyncPingDelay);
                }
            }
        }

        private static async Task<string> UploadDataset(HttpClient client, string datasetFileName)
        {
            Console.WriteLine($"Creating a project from dataset: {datasetFileName}");
            var requestUrl = $"{apiRootUrl}/projects/";
            var projectName = Path.GetFileName(datasetFileName);

            using (var content = new MultipartFormDataContent())
            {
                content.Add(new ByteArrayContent(File.ReadAllBytes(datasetFileName)), "file", projectName);
                var response = await client.PostAsync(requestUrl, content);
                if (!response.IsSuccessStatusCode)
                {
                    await PrintHttpError(response);
                }

                var statusUrl = response.Headers.GetValues("Location").First();
                var projectUrl = await WaitForAsyncResolution(client, statusUrl);

                Console.WriteLine($"Project created at URL: {projectUrl}");
                return projectUrl;
            }
        }

        private static string GetProjectIdFromUrl(string projectUrl)
        {
            var projectUrlComponents = projectUrl.Split('/');
            var projectId = projectUrlComponents[projectUrlComponents.Length - 2];
            return projectId;
        }

        private static async Task SetTarget(HttpClient client, string projectId, string targetName)
        {
            Console.WriteLine($"Setting target '{targetName}' for project {projectId}");
            var requestUrl = $"{apiRootUrl}/projects/{projectId}/aim/";
            var method = new HttpMethod("PATCH");

            var payload = new Dictionary<string, object>{
                {"mode", "auto"},
                {"target", targetName},
                {"metric", "LogLoss"},
                // These fields are not required but we specify them just to run the project faster.
                {"quickrun", true},
                {"cvMethod", "random"},
                {"validationType", "TVH"},
                {"validationPct", 16},
                {"holdoutPct", 20},
            };

            var request = new HttpRequestMessage(method, requestUrl)
            {
                Content = new StringContent(JsonConvert.SerializeObject(payload), Encoding.UTF8, "application/json")
            };

            var response = await client.SendAsync(request);
            if (!response.IsSuccessStatusCode)
            {
                await PrintHttpError(response);
            }

            var statusUrl = response.Headers.GetValues("Location").First();
            await WaitForAsyncResolution(client, statusUrl);
        }

        private static async Task WaitForAutopilot(HttpClient client, string projectId)
        {
            Console.WriteLine("Waiting for autopilot to complete...");
            while (true)
            {
                Console.Write("Checking autopilot status... ");
                var requestUrl = $"{apiRootUrl}/projects/{projectId}/status/";
                var response = await client.GetAsync(requestUrl);
                if (!response.IsSuccessStatusCode)
                {
                    await PrintHttpError(response);
                }

                dynamic responseJson = JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());

                var isAutopilotDone = responseJson.autopilotDone == true;
                if (isAutopilotDone)
                {
                    Console.WriteLine("done");
                    break;
                }
                else
                {
                    Console.WriteLine("not done yet, will check later");
                    await Task.Delay(AsyncPingDelay);
                }
            }
        }

        private static async Task PrintLeaderboard(HttpClient client, string projectId)
        {
            Console.WriteLine("Retrieving the leaderboard...");
            var requestUrl = $"{apiRootUrl}/projects/{projectId}/models/";
            var response = await client.GetAsync(requestUrl);
            if (!response.IsSuccessStatusCode)
            {
                await PrintHttpError(response);
            }

            dynamic responseJson = JsonConvert.DeserializeObject(await response.Content.ReadAsStringAsync());
            foreach (dynamic model in responseJson)
            {
                Console.WriteLine($"Model: {model.modelType}, Validation score: {model.metrics.LogLoss.validation}");
            }
        }

        public static async Task RunDataRobotAutopilotDemo()
        {
            HttpClientHandler httpClientHandler = new HttpClientHandler
            {
                // We will check for HTTP 303 status codes in the async routes manually.
                AllowAutoRedirect = false
            };

            using (var client = new HttpClient(httpClientHandler))
            {
                client.DefaultRequestHeaders.Add("Authorization", $"Token {apiToken}");

                // POST /projects/
                var projectUrl = await UploadDataset(client, dataset);
                var projectId = GetProjectIdFromUrl(projectUrl);

                // PATCH /projects/projectId/aim/
                await SetTarget(client, projectId, target);

                // GET /projects/projectId/status/
                await WaitForAutopilot(client, projectId);

                // GET /projects/projectId/models/
                await PrintLeaderboard(client, projectId);
            }
        }

        public static void Main(string[] args)
        {
            Task.Run(async () => await RunDataRobotAutopilotDemo()).GetAwaiter().GetResult();
            Console.WriteLine("Done! Press any key to exit.");
            Console.ReadKey(true);
        }
    }
}

Thanks Yuri, is there a chance you could extend your sample code above to demonstrate manual mode? Btw I added you to linkedIn, I'm a big customer of yours, DR is a great product! :)