Click or drag to resize

IPredicateExpression Interface

Interface for a PredicateExpression, which is a grouped set of Predicates. A predicate expression is usable as a WHERE clause. Generic

Namespace:  SD.LLBLGen.Pro.ORMSupportClasses
Assembly:  SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.5.0.0 (5.5.18.1019)
Syntax
public interface IPredicateExpression : IPredicate, 
	IEnumerable

The IPredicateExpression type exposes the following members.

Properties
  NameDescription
Public propertyCount
Gets the amount of predicate expression elements in this predicate expression. This is including all operators.
Public propertyDatabaseSpecificCreator
Object which will be used to create valid parameter objects, field names, including prefix/postfix characters, and conversion routines, and field names, including prefix/postfix characters. Uses the strategy pattern so the generic code can work with more than one target database.
(Inherited from IPredicate.)
Public propertyInstanceType
The PredicateType of this instance. Used to determine the instance nature without a lot of casting.
(Inherited from IPredicate.)
Public propertyItem
Gets the predicate expression element at the index specified
Public propertyNegate
Flag for setting the Predicate to negate itself, i.e. to add 'NOT' to its result.
(Inherited from IPredicate.)
Public propertyObjectAlias
Alias for the object the field belongs to. Used to identify which entity to use when the entity is present multiple times in a relation collection. Alias has to match an alias specified in the relation collection or should be left empty if no alias is specified (or no relation collection is used).
(Inherited from IPredicate.)
Public propertyParameters
The list of parameters created when the Predicate was translated to text usable in a query. Only valid after a succesful call to ToQueryText
(Inherited from IPredicate.)
Top
Methods
  NameDescription
Public methodAdd
Adds an IPredicate implementing object to the PredicateExpression. This can be a Predicate derived class or a PredicateExpression. If no object is present yet in the PredicateExpression, no operator is added, otherwise the object is added with an 'And'-operator.
Public methodAddWithAnd
Adds an IPredicate implementing object to the PredicateExpression with an 'And'-operator. The object added can be a Predicate derived class or a PredicateExpression. If no objects are present yet in the PredicateExpression, the operator is ignored.
Public methodAddWithOr
Adds an IPredicate implementing object to the PredicateExpression with an 'Or'-operator. The object added can be a Predicate derived class or a PredicateExpression. If no objects are present yet in the PredicateExpression, the operator is ignored.
Public methodClear
Clears this instance.
Public methodGetEnumerator
Returns an enumerator that iterates through a collection.
(Inherited from IEnumerable.)
Public methodGetFrameworkElementsInPredicate
Gets a list of all framework objects (fields, expression objects etc.) which are located in this IPredicate instance. E.g. a FieldCompareValuePredicate will return a list with 1 IEntityFieldCore instance: the field to compare. If no framework elements are present in the predicate, the base implementation is used, which returns an empty list. This routine is used to gather information for Linq queries.
(Inherited from IPredicate.)
Public methodReadXml
Deserializes the predicate data on the xml reader into a predicate instance
(Inherited from IPredicate.)
Public methodToQueryText
Retrieves a ready to use text representation of the contained Predicate.
(Inherited from IPredicate.)
Public methodToQueryText(Boolean)
Retrieves a ready to use text representation of the contained Predicate.
(Inherited from IPredicate.)
Public methodWriteXml
Serializes the predicate as xml to the writer specified.
(Inherited from IPredicate.)
Top
Extension Methods
  NameDescription
Public Extension MethodAnd
Returns a new PredicateExpression with contents: predicate AND toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodAndNot
Returns a new PredicateExpression with contents: predicate AND NOT toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodAs
Specifies an alias for the value returned by the predicate when the predicate is used in a projection. Equal to: Functions.IIF(predicate, true, false).As(alias)
(Defined by PredicateExtensionMethods.)
Public Extension MethodAsBooleanValue
Returns the predicate wrapped in a CASE WHEN (predicate) THEN 1 ELSE 0 END construct (as a function call expression) so the predicate can be used as a real boolean value in other places than the Where clause.
(Defined by PredicateExtensionMethods.)
Public Extension MethodIsEmpty
Determines whether the specified predicate or predicate expression is empty. A null passed in is also considered empty
(Defined by ORMClassExtensions.)
Public Extension MethodOr
Returns a new PredicateExpression with contents: predicate OR toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodOrNot
Returns a new PredicateExpression with contents: predicate OR NOT toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodToValue
Placeholder method which is used in a Select(lambda func) projection inside the lambda to specify the type of the result of the passed in predicate. Use this method only when specifying a predicate in the projection lambda.
(Defined by PredicateExtensionMethods.)
Top
See Also