Dynamics Crm 365 查詢Retrieve的Plugins，需要通過業務邏輯判斷，將部分欄位不展示處理，但是遇到EntityReference=Null沒有效果

原先做的處理是：不能檢視的欄位直接賦值NULL，但是奇怪的是PC段沒問題，手機端Cube卻針對EntityReference和OptionSettion型別的沒有效果

後來換了一種思路， 在postRetrieve的時候再查詢一次，然後覆蓋entity返回

    public class RetrieveParameters : IPlugin
    {
        public void Execute(IServiceProvider serviceProvider)
        {

            Microsoft.Xrm.Sdk.IPluginExecutionContext context 
 
= (Microsoft.Xrm.Sdk.IPluginExecutionContext)
            serviceProvider.GetService(typeof(Microsoft.Xrm.Sdk.IPluginExecutionContext));

            IOrganizationServiceFactory serviceFactory = (IOrganizationServiceFactory)serviceProvider.GetService(typeof(IOrganizationServiceFactory));
            IOrganizationService service 
 
= serviceFactory.CreateOrganizationService(context.UserId);
            IOrganizationService adminService = serviceFactory.CreateOrganizationService(null);

            ITracingService tracer = (ITracingService)serviceProvider.GetService(typeof(ITracingService));
            tracer.Trace("開始執行線索RetrieveParameters外掛Execute方法。
 
");
            if (context.Depth > 1)
            {
                tracer.Trace("context.Depth > 1 返回執行程式");
                return;
            } if (context.OutputParameters.Contains("BusinessEntity"))
            {
                Entity entity = (Entity)context.OutputParameters["BusinessEntity"];
                tracer.Trace(entity.LogicalName);
                if (BllService.CheckOwner(entity,adminService,context,tracer,isSalesManager))
                {
                    return;
                }
                if (entity.LogicalName == "account")
                {
                    #region 客戶
                    if (BllService.checkAccountGroupAndShare(entity, adminService, context, tracer))
                    {
                        return;
                    }

                    BllService.cleanAccountIndustry1(entity, adminService);
                    var Attributes = entity.Attributes.ToArray();

                    entity = service.Retrieve("account", entity.Id, new ColumnSet("accountid", "name", "accountnumber", "ownerid", "scc_cust_class"));

                    //for (int i = 0; i < Attributes.Count(); i++) //舊方式
                    //{
                    //    var attribute = Attributes[i];
                    //    if (attribute.Key != "accountid" && attribute.Key != "name" && attribute.Key != "accountnumber" && attribute.Key != "ownerid" && attribute.Key != "scc_cust_class")
                    //    {
                    //        entity[attribute.Key] = null;
                    //    }
                    //}

                    #endregion

                }
              
                context.OutputParameters["BusinessEntity"] = entity;
            }
        }
    }