GridColumnDataEventArgs.Source Property

Gets the grid that raised the event.

Namespace: DevExpress.XamarinForms.DataGrid

Assembly: DevExpress.XamarinForms.Grid.dll

Declaration

public DataGridView Source { get; }

Property Value

Type	Description
DataGridView	A DataGridView object that raised the event.

Example

Assume that the DataGridView instance is bound to a collection of orders. An order has the Product.Name, Product.UnitPrice and Quantity fields. This example shows how to add an unbound column (Total) to the grid to calculate each order amount according to the expression: UnitPrice*Quantity.

Implement logic to calculate column values in one of the following ways:

• Use the GridColumn.UnboundExpression property:

XAML

<dxg:DataGridView x:Name="grid" ItemsSource="{Binding Orders}">
    <dxg:DataGridView.Columns>
        <dxg:TextColumn FieldName="Product.Name" Caption="Product" Width="170" />
        <dxg:NumberColumn FieldName="Product.UnitPrice" Caption="Price" DisplayFormat="C0"/>
        <dxg:NumberColumn FieldName="Quantity"/>
        <dxg:NumberColumn FieldName="Total" UnboundType="Integer"
                          UnboundExpression="[Quantity] * [Product.UnitPrice]" 
                          IsReadOnly="True" DisplayFormat="C0"/>
    </dxg:DataGridView.Columns>
</dxg:DataGridView>

• Use the DataGridView.CustomUnboundColumnData event:

XAML

<dxg:DataGridView x:Name="grid" ItemsSource="{Binding Orders}" CustomUnboundColumnData="Grid_CustomUnboundColumnData">
    <dxg:DataGridView.Columns>
        <dxg:TextColumn FieldName="Product.Name" Caption="Product" Width="170" />
        <dxg:NumberColumn FieldName="Product.UnitPrice" Caption="Price" DisplayFormat="C0"/>
        <dxg:NumberColumn FieldName="Quantity"/>
        <dxg:NumberColumn FieldName="Total" UnboundType="Integer"
                          IsReadOnly="True" DisplayFormat="C0"/>
    </dxg:DataGridView.Columns>
</dxg:DataGridView>

C#

// Returns the total for a specific row.
decimal getTotalValue(DataGridView grid, int rowHandle) {
    decimal unitPrice = Convert.ToDecimal(grid.GetCellValue(rowHandle, "Product.UnitPrice"));
    decimal quantity = Convert.ToDecimal(grid.GetCellValue(rowHandle, "Quantity"));
    return unitPrice * quantity;
}

// Provides data for the Total column.
void Grid_CustomUnboundColumnData(object sender, GridColumnDataEventArgs e) {
    if (e.Column.FieldName == "Total" && e.IsGetData)
        e.Value = getTotalValue (e.Source, e.RowData.RowHandle);
}