create and update plugin in crm 2013 c# - plugins

Question

I need to write plugin in CRM 2013 that do two thing:
If statecode = 3 and the field el_meeting_in_outlook_id is empty I
need to create a new appoitment.
If statecode = 3 and the field el_meeting_in_outlook_id is not empty
I need to update an existing appoitment.
This is what I wrote:
using Microsoft.Xrm.Sdk;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using tmura_Entity_Plugins;
namespace tmura_Entity__Plugins
{
public class postCreateUpdateServiceAppointment : Plugin
{
public postCreateUpdateServiceAppointment()
: base(typeof(postCreateUpdateServiceAppointment))
{
base.RegisteredEvents.Add(new Tuple<int, string, string, Action<LocalPluginContext>>(40, "Create", null, new Action<LocalPluginContext>(ExecutePostCreate)));
base.RegisteredEvents.Add(new Tuple<int, string, string, Action<LocalPluginContext>>(40, "Update", null, new Action<LocalPluginContext>(ExecutePostUpdate)));
}
private void ExecutePostCreate(LocalPluginContext obj)
{
Logger.WriteMessage("Enter ExecutePostCreate", CrmLogService.MessageLevel.Info, "");
if ((obj.PluginExecutionContext.InputParameters.Contains("Target")) && (obj.PluginExecutionContext.InputParameters["Target"] is Entity))
{
Entity serviceAppontment = (Entity)obj.PluginExecutionContext.InputParameters["Target"];
if (serviceAppontment.LogicalName != "serviceappointment")
return;
Logger.WriteMessage("", CrmLogService.MessageLevel.Info, "");
if ((serviceAppontment.Attributes.Contains("statecode")) || ((int)(serviceAppontment.Attributes["statecode"]) == 3) && (serviceAppontment.Attributes["el_meeting_in_outlook_id"] == null))
{
try
{
Entity appointment = new Entity("appointment");
appointment.Attributes.Add("subject", "Opened automatically");
appointment.Attributes.Add("description", "Just Checking");
appointment.Attributes.Add("el_serviceappointment_id", new EntityReference("serviceappointment", serviceAppontment.Id));
appointment.Attributes.Add("scheduledstart", DateTime.Now.AddDays(7));
appointment.Attributes.Add("scheduledend", DateTime.Now.AddDays(7));
obj.OrganizationService.Create(appointment);
}
catch (Exception ex)
{
Logger.WriteException(ex);
}
}
else if (((int)(serviceAppontment.Attributes["statecode"]) == 3) && (serviceAppontment.Attributes["el_meeting_in_outlook_id"] != null))
{
//TODO
}
}
}
}
}
I don't know what to write in the second section that is supposed to update the appointment. I tried to search the web but with no success.
Can you please help?

Answer 1

Where you have defined the registered events, you have to put "serviceappointment", that is the entity logical name, instead of null.
Then replace: (serviceAppontment.Attributes.Contains("statecode")) || ((int)(serviceAppontment.Attributes["statecode"]) == 3) by (serviceAppontment.Attributes.Contains("statecode")) && ((OptionSetValue)(serviceAppontment.Attributes["statecode"]).Value == 3), because the field "statecode" is an OptionSet. Also replace the || by &&, because when serviceAppontment.Attributes.Contains("statecode")) is false, ((OptionSetValue)(serviceAppontment.Attributes["statecode"]).Value will throw an NullReferenceException.
To update an existing appointment, looks like there is an lookup in appointment entity to serviceappointment entity. So, you have to retrieve all the appointments related with the serviceappointment. You can use this query:
QueryExpression queryExp = new QueryExpression
{
EntityName = "appointment",
ColumnSet = new ColumnSet("subject", "description", "scheduledstart", "scheduledend"),
Criteria = new FilterExpression
{
Conditions = { new ConditionExpression("el_serviceappointment_id", ConditionOperator.Equal, serviceAppontment.Id) }
}
};
EntityCollection collection = obj.OrganizationService.RetrieveMultiple(queryExp);
if (collection.Entities.Count > 0)
{
// now that you have all the appointments related with the serviceappoitement
// you can update de any appointment you want
obj.OrganizationService.Update(appointment);
}

Answer 2

To update your record with a value in a lookup field in serviceappoitnment to may retrieve the serviceappoitment record Entity svcApp = obj.OrganizationService.Retrieve(serviceAppontment.LogicalName, serviceAppontment.Id, new ColumnSet("<lookup_field_in_serviceappoitnment>");
You need to add to the collumnset in the query expression the attribute requiredattendees, and then update the appoitment
if(appointment.Attributes.Contains("requiredattendees") == true)
{
appointment.Attributes["requiredattendees"] = svcApp.Attributes["<lookup_field_in_serviceappoitnment>"];
}
else
{
appointment.Attributes.Add("requiredattendees", svcApp.Attributes["<lookup_field_in_serviceappoitnment>");
}