Understanding the available query criteria

Each object type that can be queried (see Understanding CQL) has a set of query criteria. Some of these criteria are common to several object types, while others are unique to a single object type.

Most of the supported object types can be queried by using the following criteria:


Query criteria	Description
object.IsNull()	Returns True if the object is a null object
object.IsNumeric()	Returns True if the object can be converted to a numeric value (that is, an integer or double object)
object.This()	Returns a copy of the object
object.ToBool()	Converts the current object to a Boolean value (True or False)
object.ToDouble()	Converts the value of the object to a double object
object.ToInt()	Converts the value of the object to an integer
object.ToString()	Converts the value of the object to a string
object.TypeName()	Returns a string containing the type name of the object

For information on all the query criteria that are supported by each object type, see the following topics: