如何知道用户是否已选择或取消选择DataGrid的所有行？ [英] How do I know if the user has selected or deselected all rows of the DataGrid ?

问题描述

这是我的DataGrid，我怎么知道用户是否选择或取消选择了DataGrid的所有行？



谢谢

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

Thanks

<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>

推荐答案

SelectionMode =扩展可以。您可以在DataGrid中的Selection_Changed事件中编写这行代码：

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

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;
        }
    }
}

希望有所帮助。

Hope it helps.

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