How do I know if the user has selected or deselected all rows of the DataGrid ?

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This is my DataGrid, how do I know if the user has selected or deselected all rows of the DataGrid ?

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XML

<DataGrid ItemsSource="{Binding Dati_Viag}" SelectedItem="{Binding SelectDat}" Style="{DynamicResource ST_DataGrid}"
          CellStyle="{DynamicResource St_DataGridCellStyle}" SelectionMode="Extended" Name="Dg_Dati" >
   <DataGrid.Columns>
        <DataGridTextColumn x:Name="col_A" Binding="{Binding Path=A}" Header="A" Width="250" />
        <DataGridTextColumn x:Name="col_U" Binding="{Binding Path=B}" Header="B" Width="250" />
        <DataGridTextColumn x:Name="col_K" Binding="{Binding Path=C}" Header="C"  Width="250" />
   </DataGrid.Columns>
</DataGrid>

Posted 2-Jan-15 3:05am

abarosini

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Christian Amado 2-Jan-15 9:26am

Handle the SelectionChanged event of your DataGrid.

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Christian Amado · Answer 1 · 2015-01-02T03:25:00

Hi,
SelectionMode="Extended" are OK there. You can write this line of code inside of your Selection_Changed event from the DataGrid:

C#

private void Dg_Dati_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (this.Dg_Dati.SelectedItems != null) //Avoid exception
    {
        if (this.Dg_Dati.SelectedItems.Count == 0)
        {
            MessageBox.Show("The user has deselected all rows");
            return;
        }

        if (this.Dg_Dati.SelectedItems.Count == this.Dg_Dati.Items.Count)
        {
            MessageBox.Show("The user has selected all rows");        
            return;
        }
    }
}

Hope it helps.