构建一个QueryExpression,其中name字段是A或B.

Question

我正在尝试构建Dynamics CRM 4查询,以便我可以获取名为"事件A"或"事件B"的日历事件.

QueryByAttribute似乎没有完成这项工作,因为我无法指定"event_name"="事件B"的"event_name"="Event A"字段.

使用QueryExpression时,我发现FilterExpression适用于引用实体.我不知道FilterExpression是否可以在Referenced Entity上使用.下面的示例类似于我想要实现的内容,尽管这将返回一个空结果集,因为它将在名为"my_event_response"的实体中查找"name"属性.它开始看起来我需要运行几个查询才能得到这个,但这比我一次提交所有内容的效率低.

ColumnSet columns = new ColumnSet();
columns.Attributes = new string[]{ "event_name", "eventid", "startdate", "city" };

ConditionExpression eventname1 = new ConditionExpression();
eventname1.AttributeName = "event_name";
eventname1.Operator = ConditionOperator.Equal;
eventname1.Values = new string[] { "Event A" };

ConditionExpression eventname2 = new ConditionExpression();
eventname2.AttributeName = "event_name";
eventname2.Operator = ConditionOperator.Equal;
eventname2.Values = new string[] { "Event B" };

FilterExpression filter = new FilterExpression();
filter.FilterOperator = LogicalOperator.Or;
filter.Conditions = new ConditionExpression[] { eventname1, eventname2 };

LinkEntity link = new LinkEntity();

link.LinkCriteria = filter;

link.LinkFromEntityName = "my_event";
link.LinkFromAttributeName = "eventid";

link.LinkToEntityName = "my_event_response";
link.LinkToAttributeName = "eventid";

QueryExpression query = new QueryExpression();
query.ColumnSet = columns;
query.EntityName = EntityName.mbs_event.ToString();
query.LinkEntities = new LinkEntity[] { link };

RetrieveMultipleRequest request = new RetrieveMultipleRequest();
request.Query = query;

return (RetrieveMultipleResponse)crmService.Execute(request);

我很欣赏一些关于如何获取所需数据的建议.

Answer 1

QueryExpression对象具有您可以设置的Criteria属性.如果您要查找名称为A或名称为B的"my_event"记录,请将其设置为:

ColumnSet columns = new ColumnSet();
columns.Attributes = new string[]{ "event_name", "eventid", "startdate", "city" };

ConditionExpression eventname1 = new ConditionExpression();
eventname1.AttributeName = "event_name";
eventname1.Operator = ConditionOperator.Equal;
eventname1.Values = new string[] { "Event A" };

ConditionExpression eventname2 = new ConditionExpression();
eventname2.AttributeName = "event_name";
eventname2.Operator = ConditionOperator.Equal;
eventname2.Values = new string[] { "Event B" };

FilterExpression filter = new FilterExpression();
filter.FilterOperator = LogicalOperator.Or;
filter.Conditions = new ConditionExpression[] { eventname1, eventname2 };

QueryExpression query = new QueryExpression();
query.ColumnSet = columns;
query.EntityName = EntityName.mbs_event.ToString();
query.Criteria = filter;

RetrieveMultipleRequest request = new RetrieveMultipleRequest();
request.Query = query;

return (RetrieveMultipleResponse)crmService.Execute(request);

如果您只查找具有响应的事件,请保留LinkEntity部分,但将FilterExpression移动到QueryExpression对象,就像我上面一样.