Small sample code for DAX REST API.

BlogArticleUploads/DAX Rest API Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Web.Script.Serialization;
+using System.Threading.Tasks;
+using Microsoft.Identity.Client;
+
+namespace ConsoleApp1
+{
+    public class QueryRequest
+    {
+        public class Query
+        {
+            public string query { get; set; }
+        }
+
+        public List<Query> queries { get; set; }
+
+        public QueryRequest()
+        {
+        }
+
+        public QueryRequest(string daxQuery)
+        {
+            queries = new List<Query> { new Query { query = daxQuery } };
+        }
+    }
+
+    public class ParsedResponse
+    {
+        public class Result
+        {
+            public class Table
+            {
+                public List<Dictionary<string, object>> rows { get; set; }
+            }
+            public List<Table> tables { get; set; }
+        }
+        public List<Result> results { get; set; }
+    }
+  
+    class Program
+    {
+        /// <summary>
+        /// Please fill in the application parameters.
+        /// </summary>
+        private static string clientId = "<Provide your app's client Id>";
+        private static string tenantID = "<Provide your Azure tenant Id>";
+        private static string replyUrl = "<Provide your app's reply Url>";
+        private static string resourceID = "https://analysis.windows.net/powerbi/api";
+
+        /// <summary>
+        /// Please provide the DAX Rest API parameters.
+        /// </summary>
+        private static Guid datasetId = new Guid("<Provide a dataset Id>");
+        private static string daxQuery = @"<Provide a DAX query>";
+
+        static void Main(string[] args)
+        {
+            string authToken = GetToken().Result;
+
+
+            string jsonResponse;
+            if (QueryDataset(datasetId, daxQuery, authToken, out jsonResponse))
+            {
+                var queryResponse = new JavaScriptSerializer().Deserialize<ParsedResponse>(jsonResponse);
+                foreach (var row in queryResponse.results[0].tables[0].rows)
+                {
+                    foreach (var keyValuePair in row)
+                    {
+                        Console.WriteLine($"{keyValuePair.Key}:{keyValuePair.Value}");
+                    }
+                    Console.WriteLine();
+                }
+            }
+            else
+            {
+                Console.WriteLine("The Web request did not succeed.");
+            }
+
+            Console.WriteLine("Press [Enter] to exit the console app...");
+            Console.ReadLine();
+        }
+
+        private static async Task<string> GetToken()
+        {
+            IPublicClientApplication PublicClientApp = PublicClientApplicationBuilder.Create(clientId)
+                                                            .WithRedirectUri(replyUrl)
+                                                            .WithAuthority(AzureCloudInstance.AzurePublic, tenantID)
+                                                            .Build();
+            AuthenticationResult authResult = await PublicClientApp.AcquireTokenInteractive(scopes: new[] { resourceID + "/Dataset.Read.All" })
+                                                                    .ExecuteAsync();
+
+            return authResult.AccessToken;
+        }
+
+        static bool QueryDataset(Guid datasetId, string daxQuery, string authToken, out string jsonResponse)
+        {
+
+            HttpClient client = new HttpClient();
+            client.DefaultRequestHeaders.Authorization =
+                new AuthenticationHeaderValue("Bearer", authToken);
+
+            string url = $"https://api.powerbi.com/v1.0/myorg/datasets/{datasetId}/executeQueries";
+
+            var requestBody = new JavaScriptSerializer().Serialize(
+                new QueryRequest(daxQuery)
+                );
+
+
+            var response = client.PostAsync(url, new StringContent(requestBody, UnicodeEncoding.UTF8, "application/json")).Result;
+            jsonResponse = response.Content.ReadAsStringAsync().Result;
+
+            return response.IsSuccessStatusCode;
+        }
+    }
+}