PostRowsInGroups is giving badRequest from Json object

daveParso

You can add try..catch blocks to get the bad request details.

try
                {
                    client.Datasets.PostRowsInGroup(groupId, yourdatesetid, "RealTimeData", dataObj);
                }
catch (HttpOperationException ex)
               { 
                    //Bad Request
                    var content = ex.Response.Content;
                    Console.WriteLine(content); 
                }

Based on my test, my below demo work.

        static void Main(string[] args)
        {
            var credentials = new TokenCredentials(accessToken);
            using (var client = new PowerBIClient( credentials))
            {
                var payload = new testValues
                {
                    value1 = "test",
                    value2 = 1,
                    value3 = DateTime.UtcNow
                   // value3 = DateTime.UtcNow.ToString("s") + "Z"
                };

                IList<testValues> list = new List<testValues>();

                list.Add(payload);

                var stringPayload = JsonConvert.SerializeObject(list);
                object dataObj = Newtonsoft.Json.JsonConvert.DeserializeObject<Object>(stringPayload.ToString());
                //StringContent postContent = new StringContent(stringPayload, Encoding.UTF8, "application/json");
                try
                {
                    client.Datasets.PostRowsInGroup(groupId,datasetId, "RealTimeData", dataObj);
                }
                catch (HttpOperationException ex)
               { 
                    //Bad Request
                    var content = ex.Response.Content;
                    Console.WriteLine(content); 
                }
                 
            }

            Console.WriteLine("Done");
            Console.ReadKey();

        }