CRM Dynamics获取相关帐户的联系人

我正在针对CRM中的帐户创建电话呼叫活动，我需要将电话呼叫的to属性分配给检索到的帐户相关联系人，我如何做到这一点，请参阅下面的代码

public static void GetRelevantOutboundCallCenter(IOrganizationService service)
    {
        QueryExpression qe = new QueryExpression();
        qe.EntityName = "account";
        qe.ColumnSet = new ColumnSet("new_accountactionedstatus", "name", "telephone1", "primarycontactid");
        qe.Criteria.AddCondition("new_deliverystatus", ConditionOperator.Equal, 279640000);
        qe.Criteria.AddCondition("new_province", ConditionOperator.Equal, 100000018);
        qe.Criteria.AddCondition("statecode", ConditionOperator.Equal, 0);

        EntityCollection response = service.RetrieveMultiple(qe);
        var counter = 0;
        foreach (Entity account in response.Entities)
        {
            PhoneCall phone = new PhoneCall();
            ActivityParty from = new ActivityParty();
            phone.OwnerId = from.PartyId = new EntityReference("systemuser", new Guid("6DEFA813-56F9-E411-80CC-00155D0B0C2D"));
            ActivityParty to = new ActivityParty();
            to.PartyId = account.ToEntityReference();
            phone.From = new ActivityParty[] { from };
            phone.DirectionCode = true;
            phone.To = new ActivityParty[] { to };// I need to set the related Contact of the account here
            phone.PhoneNumber = account.Attributes["telephone1"].ToString();
            phone.Subject = "TEST FOR OUTBOUND";
            service.Create(phone);
            counter++;
            if (counter == 438)
                return;
        }
    }

这是我设置查找帐户的地方，我需要这是与检索到的帐户相关的联系人——电话。To=新ActivityParty[]｛To｝；

to.PartyId = account.ToEntityReference();

to.PartyId = account.GetEntityAttribute<EntityReference>("primarycontactid");