PivotCustomFieldValueCellsEventArgs.FindCell(Boolean, Predicate<Object[]>) Method

Returns the header of the column/row whose summary values match the specified condition.

Namespace: DevExpress.Web.ASPxPivotGrid

Assembly: DevExpress.Web.ASPxPivotGrid.v21.1.dll

Declaration

public FieldValueCell FindCell(
    bool isColumn,
    Predicate<object[]> match
)

Parameters

Name Type Description
isColumn Boolean

true to locate a column; false to locate a row.

match Predicate<Object[]>

A System.Predicate that specifies the condition used to locate the column/row.

Returns

Type Description
FieldValueCell

A FieldValueCell object, representing the header of the column/row whose summary values match the specified predicate; null if no columns/rows match the predicate.

Remarks

To get all field value cells, use the FindAllCells method.

Call the PivotCustomFieldValueCellsEventArgs.GetCell method to obtain field value cells by their indexes.

Example

The following example demonstrates how to handle the CustomFieldValueCells event to locate a specific column/row header identified by its column's/row's summary values.

In this example, a predicate is used to locate a column that contains only zero summary values. The column header is obtained by the event parameter's FindCell method, and then removed via the Remove method.

View Example

using System;
using System.Globalization;
using System.Web.UI;
using DevExpress.Web.ASPxPivotGrid;
using DevExpress.XtraPivotGrid;

namespace ASPxPivotGrid_FindCells {
    public partial class _Default : Page {
        protected void Page_Load(object sender, EventArgs e) {
            if (!IsCallback && !IsPostBack) {
                PivotHelper.FillPivot(pivotGrid);
            }
            pivotGrid.DataSource = PivotHelper.GetDataTable();
        }

        // Handles the CustomFieldValueCells event to remove columns with
        // zero summary values.
        protected void pivotGrid_CustomFieldValueCells(object sender,
                             PivotCustomFieldValueCellsEventArgs e) {
            if (pivotGrid.DataSource == null) return;
            if (radioButtonList.SelectedIndex == 0) return;

            // Obtains the first encountered column header whose column
            // matches the specified condition, represented by a predicate.
            FieldValueCell cell = e.FindCell(true, new Predicate<object[]>(

                // Defines the predicate returning true for columns
                // that contain only zero summary values.
                delegate(object[] dataCellValues) {
                    foreach (object value in dataCellValues) {
                        if (!object.Equals((decimal)0, value))
                            return false;
                    }
                    return true;
            }));

            // If any column header matches the condition, this column is removed.
            if (cell != null) e.Remove(cell);
        }
        protected void pivotGrid_FieldValueDisplayText(object sender, 
                                    PivotFieldDisplayTextEventArgs e) {
            if (e.Field == pivotGrid.Fields[PivotHelper.Month]) {
                e.DisplayText = CultureInfo.CurrentCulture.DateTimeFormat.GetMonthName((int)e.Value);
            }
        }
    }
}
See Also