Get Entity Logical Name from its Object Type Code in Dynamics 365

public static string geEntityLogicalName(int ObjectTypeCode)
{

            string entityLogicalName = String.Empty;

            MetadataFilterExpression EntityFilter = new MetadataFilterExpression(LogicalOperator.And);

            EntityFilter.Conditions.Add(new MetadataConditionExpression("ObjectTypeCode", MetadataConditionOperator.Equals, ObjectTypeCode));

            MetadataPropertiesExpression mpe = new MetadataPropertiesExpression();

            mpe.AllProperties = false;

            mpe.PropertyNames.Add("ObjectTypeCode");

            EntityQueryExpression entityQueryExpression = new EntityQueryExpression()
            {

                Criteria = EntityFilter,

                Properties = mpe

            };


            RetrieveMetadataChangesResponse initialRequest = GetMetadataChanges(entityQueryExpression, null, DeletedMetadataFilters.OptionSet);

            if (initialRequest.EntityMetadata.Count == 1)
            {

                entityLogicalName = initialRequest.EntityMetadata[0].LogicalName;

            }

            return entityLogicalName;

        }


        protected static RetrieveMetadataChangesResponse GetMetadataChanges(EntityQueryExpression entityQueryExpression, String clientVersionStamp, DeletedMetadataFilters deletedMetadataFilter)
        {

            RetrieveMetadataChangesRequest retrieveMetadataChangesRequest = new RetrieveMetadataChangesRequest();
            {

                Query = entityQueryExpression,

                ClientVersionStamp = clientVersionStamp,

                DeletedMetadataFilters = deletedMetadataFilter

            };


            return (RetrieveMetadataChangesResponse)service.Execute(retrieveMetadataChangesRequest);

  }

Dynamics 365 Entity Object Type Code List:

Complete Code:

using Microsoft.Xrm.Sdk;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.Crm.Sdk.Messages;
using System.ServiceModel.Description;
using System.Net;
using Microsoft.Xrm.Sdk.Client;
using Microsoft.Xrm.Sdk.Query;
using Microsoft.Xrm.Sdk.Metadata.Query;
using Microsoft.Xrm.Sdk.Messages;
using Microsoft.Xrm.Sdk.Metadata;

namespace CRMCodeHelper
{
class Program
{        
private static IOrganizationService service = null;
		
static void Main(string[] args)
{         
            service = ConnectToCRM();

            string entityLogicalName = geEntityLogicalName(112);

            Console.WriteLine("Entity Logical Name is: " + entityLogicalName);       

            Console.ReadLine();

} 


public static string geEntityLogicalName(int ObjectTypeCode) 

{ 

string entityLogicalName = String.Empty; 

MetadataFilterExpression EntityFilter = new MetadataFilterExpression(LogicalOperator.And); 

EntityFilter.Conditions.Add(new MetadataConditionExpression("ObjectTypeCode", MetadataConditionOperator.Equals, ObjectTypeCode)); 

MetadataPropertiesExpression mpe = new MetadataPropertiesExpression(); 

mpe.AllProperties = false; 

mpe.PropertyNames.Add("ObjectTypeCode"); 

EntityQueryExpression entityQueryExpression = new EntityQueryExpression() 

{ 

Criteria = EntityFilter, 

Properties = mpe 

}; 

RetrieveMetadataChangesResponse initialRequest = GetMetadataChanges(entityQueryExpression, null, DeletedMetadataFilters.OptionSet); 

if (initialRequest.EntityMetadata.Count == 1) 

{ 

entityLogicalName = initialRequest.EntityMetadata[0].LogicalName; 

} 

return entityLogicalName; 

} 


protected static RetrieveMetadataChangesResponse GetMetadataChanges(EntityQueryExpression entityQueryExpression, String clientVersionStamp, DeletedMetadataFilters deletedMetadataFilter) 

{ 

RetrieveMetadataChangesRequest retrieveMetadataChangesRequest = new RetrieveMetadataChangesRequest() 

{ 

Query = entityQueryExpression, 

ClientVersionStamp = clientVersionStamp, 

DeletedMetadataFilters = deletedMetadataFilter 

}; 

return (RetrieveMetadataChangesResponse)service.Execute(retrieveMetadataChangesRequest); 

} 


public static IOrganizationService ConnectToCRM() 

{ 

IOrganizationService organizationService = null;

            try
            {

                ClientCredentials clientCredentials = new ClientCredentials();

                clientCredentials.UserName.UserName = "<Username>";

                clientCredentials.UserName.Password = "<Password>";

                ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;

                organizationService = new OrganizationServiceProxy(new Uri("https://<organisation name>.crm4.dynamics.com/XRMServices/2011/Organization.svc"),

                    null, clientCredentials, null);

                return organizationService;

            }

            catch (Exception ex)
            {

                Console.WriteLine("Exception caught - " + ex.Message);

                return organizationService;

            }

        }

    }

}

Output:

Cheers