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EnumerableSelectorAggregateFunction

Class

Represents an AggregateFunction that uses aggregate extension methods provided in Enumerable using SourceField as a member selector.

Definition

Namespace:Telerik.Windows.Data

Assembly:Telerik.Windows.Data.dll

Syntax:

public abstract class EnumerableSelectorAggregateFunction : EnumerableAggregateFunctionBase, INotifyPropertyChanged

Inheritance: objectAggregateFunctionEnumerableAggregateFunctionBaseEnumerableSelectorAggregateFunction

Derived Classes: ChartAggregateFunctionAverageFunctionMaxFunctionMinFunctionSumFunction

Implements: INotifyPropertyChanged

Inherited Members EnumerableAggregateFunctionBase.AggregateMethodNameEnumerableAggregateFunctionBase.ExtensionMethodsTypeAggregateFunction.Merge(object, AggregateResultMergeAction, AggregateResult, QueryableCollectionViewGroup)AggregateFunction.OnPropertyChanged(string)AggregateFunction.CaptionAggregateFunction.FunctionNameAggregateFunction.ResultFormatStringAggregateFunction.PropertyChanged...

Constructors

EnumerableSelectorAggregateFunction()

protected EnumerableSelectorAggregateFunction()

Properties

SourceField

string

Gets or sets the name of the field, of the item from the set of items, which value is used as the argument of the aggregate function.

public virtual string SourceField { get; set; }

Property Value:

The name of the field to get the argument value from.

Gets or sets the type of the member that is used as the argument of the aggregate function. Set this property if the member type cannot be resolved automatically. Such cases are: items with ICustomTypeDescriptor, XmlNode or DataRow.

public Type SourceFieldType { get; set; }

Property Value:

The type of the member used as the argument of the aggregate function.

Methods

CreateAggregateExpression(Expression)

Expression

Creates the aggregate expression that is used for constructing expression tree that will calculate the aggregate result.

public override Expression CreateAggregateExpression(Expression enumerableExpression)

Parameters:enumerableExpressionExpression

The grouping expression.

Returns:

Expression

Overrides: AggregateFunction.CreateAggregateExpression(Expression)

GenerateFunctionName()

string

Generates default name for this function using this type's name.

protected override string GenerateFunctionName()

Returns:

string

Function name generated with the following pattern: {GetType().Name}_{GetHashCode()}.

Overrides: EnumerableAggregateFunctionBase.GenerateFunctionName()

GetAggregationValue(object)

object

protected object GetAggregationValue(object item)

Parameters:itemobjectReturns:

object