在CRM 4.0中检索单个Guid

我是CRM (version 4.0)的新手，我正在尝试根据给定的年份（也存储在实体中）返回’yearid’指南。到目前为止，我已经得到了：

  public static Guid GetYearID(string yearName) { ICrmService service = CrmServiceFactory.GetCrmService(); // Create the query object. QueryExpression query = new QueryExpression("year"); ColumnSet columns = new ColumnSet(); columns.AddColumn("yearid"); query.ColumnSet = columns; FilterExpression filter = new FilterExpression(); filter.FilterOperator = LogicalOperator.And; filter.AddCondition(new ConditionExpression { AttributeName = "yearName", Operator = ConditionOperator.Equal, Values = new object[] { yearName} }); query.Criteria = filter; } 

但我的问题是：

A）除此之外还有哪些代码可以实际存储Guid？
B）使用QueryExpression是最有效的方法吗？

Answer 1

回复：B）转向sql可能更快（我不知道多少甚至是否），但我想在99％的情况下，QueryExpression在性能方面是完全可以接受的。

回复：A）你非常接近，我已经完成了下面的代码。

 public static Guid GetYearID(string yearName) { ICrmService service = CrmServiceFactory.GetCrmService(); // Create the query object. QueryExpression query = new QueryExpression("year"); //No need to ask for the id, it is always returned //ColumnSet columns = new ColumnSet(); //columns.AddColumn("yearid"); //query.ColumnSet = columns; FilterExpression filter = new FilterExpression(); filter.FilterOperator = LogicalOperator.And; filter.AddCondition(new ConditionExpression { AttributeName = "yearName", Operator = ConditionOperator.Equal, Values = new object[] { yearName} }); query.Criteria = filter; //We have to use a retrieve multiple here //In theory we could get multiple results but we will assume we only ever get one BusinessEntityCollection years = service.RetrieveMultiple(query); DynamicEntity year = (DynamicEntity)years.BusinessEntities.First(); return ((Guid)year["yearid"]); }