Sample Workflow Acitivity C# code

 Sample Workflow Acitivity C# code

The following sample workflow activity returns the next birthday. Use this in a workflow that sends a birthday greeting to a customer.

using Microsoft.Xrm.Sdk;

using Microsoft.Xrm.Sdk.Messages;

using Microsoft.Xrm.Sdk.Query;

using Microsoft.Xrm.Sdk.Workflow;

using System;

using System.Activities;

namespace PowerApps.Samples

{

  /// <summary>

  /// Activity will return the next upcoming birthday that has just passed

  /// If this year's birthday has not yet occurred, it will return this year's

  /// birthday

  /// Otherwise, it will return the birthday for next year

  /// A workflow can timeout when on this date

  /// </summary>

  [Persist]

  public sealed class UpdateNextBirthday : CodeActivity

  {

    protected override void Execute(CodeActivityContext executionContext)

    {

      IWorkflowContext context =

          executionContext.GetExtension<IWorkflowContext>();

      // Create an Organization Service

      IOrganizationServiceFactory serviceFactory =

          executionContext.GetExtension<IOrganizationServiceFactory>();

      IOrganizationService service =

          serviceFactory.CreateOrganizationService(context.InitiatingUserId);

      // Retrieve the contact id

      Guid contactId = this.Contact.Get(executionContext).Id;

      // Create the request

      RetrieveRequest request = new RetrieveRequest();

      request.ColumnSet = new ColumnSet(new string[]{"birthdate"});

      request.Target = new EntityReference(EntityName.Contact, contactId);

      // Retrieve the entity to determine what the birthdate is set at

      Entity entity =

          (Entity)((RetrieveResponse) service.Execute(request)).Entity;

      // Extract the date out of the entity

      DateTime? birthdate;

      if (entity.Contains(ContactAttributes.Birthdate))

      {

        birthdate = (DateTime?) entity[ContactAttributes.Birthdate];

      }

      else

      {

        birthdate = null;

      }

      // Check to see if the current birthday is set. We don't want the activity

      // to fail if the birthdate is not set

      if (birthdate == null)

      {

        return;

      }

      // Calculate the next birthdate. Encapsulated in a methdo so that the

      // method can be used in the test case for verification purposes

      DateTime nextBirthdate = CalculateNextBirthday(birthdate.Value);

      // Update the next birthday field on the entity

      Entity updateEntity = new Entity(EntityName.Contact);

      updateEntity.Id = contactId;

      updateEntity["new_nextbirthday"] = nextBirthdate;

      service.Update(updateEntity);

    }

    // Define the properties

    [RequiredArgument]

    [Input("Update Next Birthdate for")]

    [ReferenceTarget("contact")]

    public InArgument<EntityReference> Contact {

      get;

      set;

    }

    private DateTime CalculateNextBirthday(DateTime birthdate)

    {

      DateTime nextBirthday =

          new DateTime(birthdate.Year, birthdate.Month, birthdate.Day);

      // Check to see if this birthday occurred on a leap year

      bool leapYearAdjust = false;

      if (nextBirthday.Month == 2 && nextBirthday.Day == 29)

      {

        // Sanity check, was that year a leap year

        if (DateTime.IsLeapYear(nextBirthday.Year))

        {

          // Check to see if the current year is a leap year

          if (!DateTime.IsLeapYear(DateTime.Now.Year))

          {

            // Push the date to March 1st so that the date arithmetic will

            // function correctly

            nextBirthday = nextBirthday.AddDays(1);

            leapYearAdjust = true;

          }

        }

        else

        {

          throw new Exception("Invalid Birthdate specified",

                              new ArgumentException("Birthdate"));

        }

      }

      // Calculate the year difference

      nextBirthday =

          nextBirthday.AddYears(DateTime.Now.Year - nextBirthday.Year);

      // Check to see if the date was adjusted

      if (leapYearAdjust && DateTime.IsLeapYear(nextBirthday.Year))

      {

        nextBirthday = nextBirthday.AddDays(-1);

      }

      return nextBirthday;

    }

  }

}