AggregateOperand.Count() Method

Initializes a new AggregateOperand instance that evaluates the count of objects in the collection. The new operand computes the aggregate value against elements of the current operand’s CollectionProperty that match the current operand’s Condition.

Namespace: DevExpress.Data.Filtering

Assembly: DevExpress.XamarinForms.Core.dll

Declaration

public AggregateOperand Count()

Returns

Type	Description
AggregateOperand	The new Count operand.

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the Count() method.

Note

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C#

XPO_how-to-create-a-filter-with-an-aggregate-function-for-a-child-collection-e1329/CS/Form1.cs#L318

private void btnFiterSimplified_Click(object sender, System.EventArgs e) {
    CriteriaOperator criteria = new OperandProperty("Orders")[null].Count() > 0;
    SetFilter(criteria);

VB.NET

XPO_how-to-create-a-filter-with-an-aggregate-function-for-a-child-collection-e1329/VB/Form1.vb#L304

Private Sub btnFiterSimplified_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnFiterSimplified.Click
    Dim criteria As CriteriaOperator = New OperandProperty("Orders").Item(Nothing).Count() > 0
    SetFilter(criteria)