Auto Number Generation / Auto ID increment using Plugin

using Microsoft.Xrm.Sdk;

using Microsoft.Xrm.Sdk.Client;

using System.Xml.Linq;

using System;

using System.Linq;

using System.Globalization;

namespace Demo.AutoNumberGeneration

{

    public class AutoNumbering : IPlugin

    {

        #region Secure/Unsecure Configuration Setup

        private string _secureConfig = null;

        private string _unsecureConfig = null;

        public AutoNumbering(string unsecureConfig, string secureConfig)

        {

            _secureConfig = secureConfig;

            _unsecureConfig = unsecureConfig;

        }

        #endregion

        public void Execute(IServiceProvider serviceProvider)

        {

            ITracingService tracer = (ITracingService)serviceProvider.GetService(typeof(ITracingService));

            IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

            IOrganizationServiceFactory factory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));

            IOrganizationService service = factory.CreateOrganizationService(context.UserId);

            OrganizationServiceContext orgService = new OrganizationServiceContext(service);

            try

            {

                Entity entity = (Entity)context.InputParameters["Target"];

                Entity autoNumberingRecord = RetrieveAutoNumbering(orgService, entity);

                UpdateNumber(service, autoNumberingRecord, entity);

                UpdateNextNumber(service, autoNumberingRecord);

            }

            catch (Exception e)

            {

                throw new InvalidPluginExecutionException(e.Message);

            }

        }

        private Entity RetrieveAutoNumbering(OrganizationServiceContext orgService, Entity entity)

        {

            Entity retrievedAutoNumber = (from an in orgService.CreateQuery("new_autonumbering")

                                          where (String)an["new_entity"] == entity.LogicalName

                                          select an).FirstOrDefault();

            Entity autoNumber = new Entity("new_autonumbering");

            autoNumber.Id = retrievedAutoNumber.Id;

            autoNumber["new_prefix"] = retrievedAutoNumber["new_prefix"];

            autoNumber["new_nextnumber"] = retrievedAutoNumber["new_nextnumber"];

            return autoNumber;

        }

        private void UpdateNumber(IOrganizationService service, Entity autoNumberingRecord, Entity target)

        {

            var prefix = autoNumberingRecord.Attributes["new_prefix"].ToString();

            var number = autoNumberingRecord.Attributes["new_nextnumber"].ToString();

            if (target.LogicalName == "new_servicerequest")

            {

                target["new_servicerequestnumber"] = prefix + "-" + number;

            }

            else if (target.LogicalName == "contact")

            {

                target["new_contactnumber"] = prefix + "-" + number;

            }

            service.Update(target);

        }

        private void UpdateNextNumber(IOrganizationService service, Entity autoNumberingRecord)

        {

            var currentNumber = (int)autoNumberingRecord.Attributes["new_nextnumber"];

            var nextNumber = currentNumber + 1;

            autoNumberingRecord["new_nextnumber"] = nextNumber;

            service.Update(autoNumberingRecord);

        }

    }

}