GridControl.CustomUnboundColumnData Event

Enables data to be supplied to unbound columns.

Namespace: DevExpress.WinUI.Grid

Assembly: DevExpress.WinUI.Grid.v22.1.dll

NuGet Package: DevExpress.WinUI

Declaration

C#

public event GridColumnDataEventHandler CustomUnboundColumnData

VB.NET

Public Event CustomUnboundColumnData As GridColumnDataEventHandler

Event Data

The CustomUnboundColumnData event's data class is GridColumnDataEventArgs. The following properties provide information specific to this event:

Property	Description
Column	Gets the unbound column currently being processed.
ListSourceRowIndex	Gets the index of the record in the data source to which the processed item corresponds.
Row	Get a data row which contains the cell currently being processed.
Source	Gets the grid control that raised the event.

The event data class exposes the following methods:

Method	Description
GetListSourceFieldValue(Int32, String)	Returns the value of the specified cell within the specified item in the grid item source.
GetListSourceFieldValue(String)	Returns the value of the specified cell within the processed item in the grid item source.

Remarks

Unbound columns are not bound to any field in the data source. In most instances, data for unbound columns is obtained from a custom data source or is calculated based upon the values of bound columns. To provide data for unbound columns, handle the CustomUnboundColumnData event.

Example

The following code sample shows how to add an unbound column to the GridControl.

XAML

<Window ...
    xmlns:dxg="using:DevExpress.WinUI.Grid">
    <dxg:GridControl ItemsSource="{x:Bind ViewModel.Source}" 
                     AutoGenerateColumns="False" 
                     CustomUnboundColumnData="GridControl_CustomUnboundColumnData">
        <dxg:GridControl.Columns>
            <dxg:GridTextColumn FieldName="ProductName"/>
            <dxg:GridSpinEditColumn FieldName="UnitPrice"/>
            <dxg:GridTextColumn FieldName="Quantity"/>
            <dxg:GridSpinEditColumn FieldName="Total" UnboundType="Decimal"/>
        </dxg:GridControl.Columns>
    </dxg:GridControl>
</Window>

C#

void GridControl_CustomUnboundColumnData(object sender, DevExpress.WinUI.Grid.GridColumnDataEventArgs e) {
    if(e.IsGetData) {
        double unitPrice = Convert.ToDouble(e.GetListSourceFieldValue("UnitPrice"));
        int quantity = Convert.ToInt32(e.GetListSourceFieldValue("Quantity"));
        e.Value = unitPrice * quantity;
    }
}

For more information, refer to the following help topic: Unbound Columns.