WPF打开windows弹窗与关闭以及Window参数为空的处理

//--------Window弹窗与关闭
                        <DataGridTemplateColumn Header="操作" Width="*">
                                                    <DataGridTemplateColumn.CellTemplate>
                                                        <DataTemplate>
                                                            <Button Style="{StaticResource CcHotelButtonStyle}" Height="30" 
                Command="{Binding DataContext.ColorSetBtnCommand, 
            RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=DataGrid}}">颜色设置</Button>
                                                        </DataTemplate>
                                                    </DataGridTemplateColumn.CellTemplate>
                                                </DataGridTemplateColumn>

    private void ExitWindow(Window t)
        {
            t.DialogResult = false;
            t.Close();
        }

     private void ColorSetBtnWindowShow(Window t)
        {
            var colorWindow = new HM_RoomColorContainer();
            colorWindow.Owner = t;
            colorWindow.Topmost = true;
            bool? result = colorWindow.ShowDialog();
            if (result!=null&&result.Value)
            {
    ---
            }
        }
 //关闭按钮
     <StackPanel Grid.Row="0" Orientation="Horizontal" HorizontalAlignment="Right"  Margin="0 0 3 0" Grid.Column="4">
            <cc:CcHotelButton Style="{StaticResource CcHotelButtonBaseStyle}" ButtonImage="{StaticResource Close}" Grid.Column="4"
           Command="{Binding CloseWindowForColorCommand, UpdateSourceTrigger=PropertyChanged}"
         CommandParameter="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=Window}}">关闭</cc:CcHotelButton>
        </StackPanel>