Test for a null value
Dynamics CRM 2016
Updated: November 29, 2016
Applies To: Dynamics 365 (online), Dynamics 365 (on-premises), Dynamics CRM 2016, Dynamics CRM Online
The following code example shows how to test for a null value by using the FilterExpression and QueryByAttribute classes.
Use this code to test for equality by using the FilterExpression class.
FilterExpression null_filter = new FilterExpression(LogicalOperator.And); null_filter.FilterOperator = LogicalOperator.And; null_filter.AddCondition("leadid", ConditionOperator.Null);
Use this code to test for inequality by using the FilterExpression class.
FilterExpression filter = new FilterExpression(LogicalOperator.And); filter.FilterOperator = LogicalOperator.And; filter.AddCondition("leadid", ConditionOperator.NotNull);
Use this code to test for equality by using the QueryByAttribute class.
QueryByAttribute qba = new QueryByAttribute("account"); qba.ColumnSet = new ColumnSet("name","address1_stateorprovince"); qba.AddAttributeValue("donotfax", null);
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