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247Hello,
I am trying to write a simple console application which will connect to the Dynamics 365 environment and will create a record in either Contact or Account entity. But I am facing an issue whenever I try to run it. It build successfully but when I run it it throws an exception.
Unhandled Exception: System.NullReferenceException: Object reference not set to
an instance of an object. at ConsoleApp.Program.Main(String[] args) in ******\ConsoleApp\Program.cs:line 44
Line 44 is
Guid accountId = service.Create(account);
Also please note that I am using the latest version of Dynamics 365 online.
The entire code of my program is as follows:
using Microsoft.Crm.Sdk.Messages;
using Microsoft.Xrm.Sdk;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Tooling.Connector;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.Net;
using System.ServiceModel.Description;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp
{
class Program
{
static void Main(string[] args)
{
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
//string connectionString = "Url=https://*******.crm.dynamics.com/; Username=**@******.onmicrosoft.com; Password=@Pass authtype=Office365";
string connectionString = "AuthType=OAuth;Username=**@**********onmicrosoft.com; Password=@Pass Url=https://********.crm.dynamics.com;AppId=51f81489-12ee-4a9e-aaae-a2591f45987d; RedirectUri=app://58145B91-0C36-4500-8554-080854F2AC97;LoginPrompt=Auto";
CrmServiceClient conn = new CrmServiceClient(connectionString);
OrganizationServiceProxy service = conn.OrganizationServiceProxy;
// Create Account
Entity account = new Entity("account");
account["name"] = "ABC abc";
Guid accountId = service.Create(account);
var fetch = "<fetch {0}>" +
" <entity name='account' >" +
" <attribute name='accountid' />" +
" <attribute name='name' />" +
" </entity>" +
"</fetch>";
var accountCol = RetrieveAllRecords(service, fetch);
QueryExWithPagination(service);
}
static IOrganizationService getService()
{
IOrganizationService organizationService = null;
try
{
ClientCredentials clientCredentials = new ClientCredentials();
clientCredentials.UserName.UserName = "**@******.onmicrosoft.com";
clientCredentials.UserName.Password = "@Pass;
// For Dynamics 365 Customer Engagement V9.X, set Security Protocol as TLS12
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
// Get the URL from CRM, Navigate to Settings -> Customizations -> Developer Resources
// Copy and Paste Organization Service Endpoint Address URL
organizationService = (IOrganizationService)new OrganizationServiceProxy(new Uri("https://*******.api.crm.dynamics.com/XRMServices/2011/Organization.svc"),
null, clientCredentials, null);
if (organizationService != null)
{
Guid userid = ((WhoAmIResponse)organizationService.Execute(new WhoAmIRequest())).UserId;
if (userid != Guid.Empty)
{
Console.WriteLine("Connection Established Successfully...");
}
}
else
{
Console.WriteLine("Failed to Established Connection!!!");
}
}
catch (Exception ex)
{
Console.WriteLine("Exception caught - " + ex.Message);
}
return organizationService;
}
public static List<Entity> RetrieveAllRecords(IOrganizationService service, string fetch)
{
var moreRecords = false;
int page = 1;
var cookie = string.Empty;
List<Entity> Entities = new List<Entity>();
do
{
var xml = string.Format(fetch, cookie);
var collection = service.RetrieveMultiple(new FetchExpression(xml));
if (collection.Entities.Count >= 0) Entities.AddRange(collection.Entities);
moreRecords = collection.MoreRecords;
if (moreRecords)
{
page++;
cookie = string.Format("paging-cookie='{0}' page='{1}'", System.Security.SecurityElement.Escape(collection.PagingCookie), page);
}
} while (moreRecords);
return Entities;
}
public static void QueryExWithPagination(IOrganizationService service)
{
QueryExpression qe = new QueryExpression("account");
qe.ColumnSet = new ColumnSet(new string[] { "name", "description" });
ConditionExpression con1 = new ConditionExpression("name", ConditionOperator.NotNull);
ConditionExpression con2 = new ConditionExpression("description", ConditionOperator.NotNull);
FilterExpression filter = new FilterExpression();
filter.FilterOperator = LogicalOperator.And;
filter.AddCondition(con1);
filter.AddCondition(con2);
qe.Criteria = filter;
int recordCount = 0;
int pageNumber = 1;
int pageCount = 1000;
RetrieveMultipleRequest multiRequest = new RetrieveMultipleRequest();
RetrieveMultipleResponse multiResponse = new RetrieveMultipleResponse();
EntityCollection EntityRecords = new EntityCollection();
qe.PageInfo.Count = pageCount;
qe.PageInfo.PagingCookie = null;
qe.PageInfo.PageNumber = pageNumber;
multiRequest.Query = qe;
while (true)
{
multiResponse = (RetrieveMultipleResponse)service.Execute(multiRequest);
EntityCollection entityRecords = multiResponse.EntityCollection;
if (entityRecords.Entities.Count > 0)
{
foreach (Entity objrecord in entityRecords.Entities)
{
recordCount++;
// perform operation
EntityRecords.Entities.Add(objrecord);
}
}
if (entityRecords.MoreRecords)
{
pageNumber++;
qe.PageInfo.PageNumber = pageNumber;
qe.PageInfo.PagingCookie = multiResponse.EntityCollection.PagingCookie;
}
else
{
break;
}
}
}
}
}
Please tell me is any wrong I did with my code. Also if possible please share a blog or article regarding the about tutorial or sample.
Thanks
AR
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