Using/Calling Dynamics 365 Web Api for Integration and console Application in C#

 As per Microsoft Dynamics 365 V9.X release it has been advised to use Dynamics CRM WebApi for any integration with Dynamics CRM and in code written outside Plugin and Custom workflows as Microsoft has deprecated Dynamics SDK for integration purposes.

To use Dynamics web API we need to first register an application in Azure AD and get the client ID and (Secret Key or use username and password of the User instead of the secret key).

So to connect web API on any .net application you need to be ready with.

Cmponents Required Where to Find? Example Client Id        (Guid) On Register of APP “edb0f75d-9540-****-****-259e0d289148” Client Secret (Random Number Generator) On Register of APP     “jVE[Ek_CPxml@****@OULHs1g7b493?=” Username & Password of User(If secret key is not there) OAuth 2.0 v1 Endpoints On Register of APP https://login.microsoftonline.com/d245e842-b71e-42df-**** -176555cfb904/oauth2/token Crm Api URL From CRM Resource Center https://4***ember2019.crm*.dynamics.com/api/data/v9.1

References Required to Connect.

IdentityModel.Clients.ActiveDirectory (From Nuget)References Required to Connect.

• Json

Code to connect to Web API.

A basic example to Retrieve account and contact record and create contact records in CRM.

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using Microsoft.IdentityModel.Clients.ActiveDirectory;
using System.Net.Http.Headers;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Web;
using System.Web.Http;
using System.Text;
using Newtonsoft.Json;
 
namespace MyFirstWebAPI.Controllers
{
    public class CrmController : ApiController
    {
        static string serviceUri = "https://3november2019.crm8.dynamics.com/";
        //static string redirectUrl = "http://localhost:64884/";
 
        static string apiVersion = "9.1";
        static string crmapiUrl = $"{serviceUri}/api/data/v{apiVersion}/";
        private void GetAuthToken()
        {
 
            // TODO Substitute your app registration values that can be obtained after you
            // register the app in Active Directory on the Microsoft Azure portal.
            //Connect to crm API using Username and Password with oAuth 2.0 v1 Endpoints.
            //string clientId = "e36bb8ae-b29b-4d36-8fa8-45de01f0993b"; // Client ID after app registration
            //string userName = "g***@*******uk.onmicrosoft.com";
            //string password = "*******XHJg";
            //var credentials = new UserPasswordCredential(userName, password);
            //string authority = "https://login.microsoftonline.com/03b9cd1b-6cfc-4c45-****-1092fd6f0e26/oauth2/authorize";  //oAuth 2.0 v1 Endpoints
            //var context = new AuthenticationContext(authority, false);
            //var authResult = context.AcquireTokenAsync(resource: serviceUri, clientId, credentials).Result;
 
            //Connect to crm API using secretKey with oAuth 2.0 v1 Endpoints.
            string clientId = "edb0f75d-****-****-bcce-259e0d289148";
            string appKey = "jVE[Ek_****@w8Ov@OULHs1g7b493?="; //Client Secret
            ClientCredential credentials = new ClientCredential(clientId, appKey);
            string authority = "https://login.microsoftonline.com/d245e842-b71e-42df-a18e-176555cfb904/oauth2/token";
            var authResult = new AuthenticationContext(authority, true).AcquireTokenAsync(serviceUri, credentials).Result;
            //return authResult.AccessToken;
            string guid = RetrieveAccounts(authResult.AccessToken);
 
            CreateContacts(authResult.AccessToken, guid);
        }        
 
        private void CreateContacts(string accessToken, string guid)
        {
            try
            {
                JObject contact1 = new JObject{
                                            { "firstname", "Sanket" },
                                            { "lastname", "Sinha" },
                                            { "emailaddress1", "nowsanket@gmail.com" }
                                            };
 
                contact1["jobtitle"] = "Junior Developer";
                contact1.Add("modifiedby@odata.bind", "/systemusers(5ef22367-aa3f-4bbe-b490-39b332c9e6a8)");
                contact1.Add("gendercode", 1);
 
                HttpClient httpClient = new HttpClient();
                //Default Request Headers needed to be added in the HttpClient Object
                httpClient.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");
                httpClient.DefaultRequestHeaders.Add("OData-Version", "4.0");
                httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
 
                //Set the Authorization header with the Access Token received specifying the Credentials
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
 
                httpClient.BaseAddress = new Uri(crmapiUrl);
 
                HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, "contacts")
                {
                    Content = new StringContent(contact1.ToString(), Encoding.UTF8, "application/json")
                };
 
                HttpResponseMessage response = httpClient.SendAsync(request).Result;
                if (response.IsSuccessStatusCode) //204
                {
                    var entityUri = response.Headers.GetValues("OData - EntityId").FirstOrDefault();
                }
 
            }
            catch (Exception)
            {
 
                throw;
            }
        }
 
        public string RetrieveAccounts(string authToken)
        {
            string guid = string.Empty;
            HttpClient httpClient = new HttpClient();
            //Default Request Headers needed to be added in the HttpClient Object
            httpClient.DefaultRequestHeaders.Add("OData-MaxVersion", "4.0");
            httpClient.DefaultRequestHeaders.Add("OData-Version", "4.0");
            httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
 
            //Set the Authorization header with the Access Token received specifying the Credentials
            httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authToken);
 
            httpClient.BaseAddress = new Uri(crmapiUrl);
              //Examples of different filters here.
              //var response = httpClient.GetAsync("accounts?$select=name&$top=1").Result;
             //var response = httpClient.GetAsync("accounts?$select=name&$top=1").Result;
            //var response = httpClient.GetAsync("contacts?$select=fullname&$expand=parentcustomerid_account($select=accountid,name,createdon,emailaddress1,address1_telephone1)&$filter=emailaddress1 eq 'nowsanket@gmail.com'&$top=1").Result;
            var response = httpClient.GetAsync("importfiles?$select=successcount,name").Result;
            if (response.IsSuccessStatusCode)
            {
                var accounts = response.Content.ReadAsStringAsync().Result;
 
                var jRetrieveResponse = JObject.Parse(accounts);
 
                dynamic collContacts = JsonConvert.DeserializeObject(jRetrieveResponse.ToString());
 
                foreach (var data in collContacts.value)
                {
                    //You can change as per your need here
                    guid = data.importfileid.Value;
                    Console.WriteLine("Contact Name – " + data.name.Value);
                }
 
            }
            return guid;
        }
    }
}