AggregateExpression Class |
Specific expression class which represents an Aggregate expression, which is an expression which defines an aggregate function on a set.
An AggregateExpression is a SetExpression because it represents a subquery, and with that a set of one value: a scalar. The class is a
SetExpression because it contains a scope of aliases, and alias scopes are properly handled for set expressions.
Inheritance HierarchySystemObject
System.Linq.ExpressionsExpression
SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClassesCommonExpression
SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClassesSetExpression
SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClassesAggregateExpression
System.Linq.ExpressionsExpression
SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClassesCommonExpression
SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClassesSetExpression
SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClassesAggregateExpression
Namespace: SD.LLBLGen.Pro.LinqSupportClasses.ExpressionClasses
Assembly: SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.9.0.0 (5.9.0)
SyntaxThe AggregateExpression type exposes the following members.
Constructors| Name | Description | |
|---|---|---|
 | AggregateExpression(AggregateFunction, Type) |
Initializes a new instance of the AggregateExpression class.
|
| AggregateExpression(AggregateFunction, Type, SetExpression, Expression) |
Initializes a new instance of the AggregateExpression class.
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Properties| Name | Description | |
|---|---|---|
 | Alias |
Gets or sets the Alias assigned to this set.
(Inherited from SetExpression.) |
| CanReduce | Indicates that the node can be reduced to a simpler node. If this returns true, Reduce() can be called to produce the reduced form. (Inherited from Expression.) |
| ContainedAliases |
Gets or sets the AliasContainer which contains the aliases inside this direct set which are reachable only INSIDE this set.
If null, it has no aliases directly inside this set, it can be the source might have contained aliases.
(Inherited from SetExpression.) |
| Function |
Gets or sets the aggregate function this expression represents.
|
| FunctionArgument |
Gets or sets the function argument expression. Can be null.
|
| IsExtractionLocked |
Gets or sets a value indicating whether this instance is extraction locked, which means a where/orderby extractor won't touch it.
(Inherited from SetExpression.) |
| NodeType |
Gets the node type of this Expression.
(Inherited from CommonExpression.) |
| RequiresProjection |
Flag which is set if this set requires a projection to be usable. This flag is later on used to determine if a projection has to be injected
into the processing result of this set if there's none defined (true), or not (false). Default is false;
(Inherited from SetExpression.) |
| Source |
Gets or sets the source expression of the select
(Inherited from SetExpression.) |
| Type |
Gets the static type of the expression that this Expression represents.
(Inherited from CommonExpression.) |
| UnionedQueries |
Set of unioned queries with this set expression
(Inherited from SetExpression.) |
| UnionedQueriesSpecified |
Gets whether there are unioned queries in this query (true) or not (false)
(Inherited from SetExpression.) |
Methods| Name | Description | |
|---|---|---|
 | Accept | Dispatches to the specific visit method for this node type. For example, MethodCallExpression calls the VisitMethodCall(MethodCallExpression). (Inherited from Expression.) |
| AppendUnionedQuery |
Appends the query specified as a unioned query with the operator specified.
(Inherited from SetExpression.) |
| AssignNewAliasIfRequired |
Assigns a new alias to this set, if necessary
(Inherited from SetExpression.) |
| Equals | Determines whether the specified object is equal to the current object. (Inherited from Object.) |
| Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
| GetHashCode | Serves as the default hash function. (Inherited from Object.) |
| GetType | Gets the Type of the current instance. (Inherited from Object.) |
| Handle |
Handles this instance using the specified handler.
(Overrides SetExpressionHandle(ScopeHandlerBase).) |
| MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
| MergeUnionedQueries |
Merges the specified union list into the set expression's unionlist.
(Inherited from SetExpression.) |
| NewAliasAssigned |
A new alias was set, using AssignNewAliasIfRequired. Use this method to map a wrapped expression to the alias set in the tracker passed in.
(Inherited from SetExpression.) |
| Reduce | Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.) |
| ReduceAndCheck | Reduces this node to a simpler expression. If CanReduce returns true, this should return a valid expression. This method can return another node which itself must be reduced. (Inherited from Expression.) |
| ReduceExtensions | Reduces the expression to a known node type (that is not an Extension node) or just returns the expression if it is already a known type. (Inherited from Expression.) |
| SetRequiresProjectionFlag |
Sets the RequiresProjection flag if this expression isn't an EntityExpression
(Inherited from SetExpression.) |
| ToString |
Returns a textual representation of the Expression.
(Overrides ExpressionToString.) |
| VisitChildren | Reduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible. (Inherited from Expression.) |
See Also