MS CRM2011 PlugIn中 建立和删除关系

此PlugIn 是update的时候执行的

// 获取执行上下文
IPluginExecutionContext context = (IPluginExecutionContext)serviceProvider.GetService(typeof(IPluginExecutionContext));

// InputParameters属性包含所有输入参数数据
 if (context.InputParameters.Contains("Target") && context.InputParameters["Target"] is Entity)
{

　　// 从输入参数中获取Target参数
     Entity entity = (Entity)context.InputParameters["Target"];
　  //检测输入的Target参数，判断其逻辑名称是否是该实体.
　　if (entity.LogicalName == "crm_media_articles")

　　{

　　　　try
           {
                        if (entity.Attributes.Contains("crm_media_articlesid"))
                        {
                            Guid regardingobjectid = new Guid(entity.Attributes["crm_media_articlesid"].ToString());
                            //创建SERVICE
                            IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
                            IOrganizationService _service = serviceFactory.CreateOrganizationService(context.UserId);
                            //渠道和媒体稿件关系
                            EntityReferenceCollection relatedEntities = new EntityReferenceCollection();
                            Relationship relationship = new Relationship("crm_crm_media_articles_crm_channel");//关系名
                            //查询原来的关系
                            ConditionExpression condition1 = new ConditionExpression();
                            condition1.AttributeName = "crm_media_articlesid";
                            condition1.Operator = ConditionOperator.Equal;
                            condition1.Values.Add(regardingobjectid);
                            FilterExpression filter1 = new FilterExpression();
                            filter1.Conditions.Add(condition1);
                            QueryExpression query = new QueryExpression();
                            query.EntityName = "crm_crm_media_articles_crm_channel";//关系实体名
                            query.ColumnSet = new ColumnSet("crm_media_articlesid", "crm_channelid");
                            query.Criteria.AddFilter(filter1);
                            EntityCollection entitys = _service.RetrieveMultiple(query);//查询存在的关系实体
                            //删除原来的关系
                            foreach (var a in entitys.Entities)
                            {
                                Guid channelid = new Guid(a.Attributes["crm_channelid"].ToString());
                                relatedEntities.Add(new EntityReference("crm_channel", channelid));
                            }
                            if (relatedEntities.Count > 0)
                            {
                                _service.Disassociate(entity.LogicalName, regardingobjectid, relationship, relatedEntities);
                            }
                            if (entity.Attributes.Contains("crm_affect_channel_content"))
                            {
                                //解析XML字段
                                string channelXml = entity.Attributes["crm_affect_channel_content"].ToString();
                                if (!String.IsNullOrEmpty(channelXml))
                                {
                                    XmlDocument xmlDoc = new XmlDocument();
                                    xmlDoc.LoadXml(channelXml);
                                    XmlNodeList nodeList = xmlDoc.GetElementsByTagName("li");
                                    relatedEntities.Clear();
                                    for (var i = 0; i < nodeList.Count; i++)
                                    {
                                        Guid channelid = new Guid(nodeList[i].Attributes["oid"].Value);
                                        relatedEntities.Add(new EntityReference("crm_channel", channelid));
                                    }
                                    //创建新的关系
                                    _service.Associate(entity.LogicalName, regardingobjectid, relationship, relatedEntities);
                                }
                            }
                        }
                    }
                    catch (Exception ex)
                    {
                        throw new InvalidPluginExecutionException(ex.Message);
                    }

　　}

}