您如何迭代并将逻辑应用于DataGrid中的行

Question

因此，我试图将计时器添加到新列“ Duration”中，该计时器减去开始的时间（它是date time ，并显示其已激活了多长时间。 到目前为止，这就是我所拥有的：

XAML：

<DataGridTextColumn Binding="{Binding BlockName}" Header="Block" Width="200"/>
<DataGridTextColumn Binding="{Binding Auditor}" Header="Auditor" Width="200"/>
<DataGridTextColumn Binding="{Binding AcctAuditor}" Header="Accounting Auditor" Width="200"/>
<DataGridTextColumn Binding="{Binding BlockLeader}" Header="Block Leader" Width="200"/>
<DataGridTextColumn x:Name="TimeStarted" Binding="{Binding TimeStarted}" Header="Started" Width="200"/>
<DataGridTextColumn x:Name="Duration" Header="Elapsed Time" Width="200"/>

背后的代码：

System.Windows.Threading.DispatcherTimer dispatcherTimer = new System.Windows.Threading.DispatcherTimer();
dispatcherTimer.Tick += dispatcherTimer_Tick;
dispatcherTimer.Interval = new TimeSpan(0, 0, 1);
dispatcherTimer.Start();

private void dispatcherTimer_Tick(object sender, EventArgs e)
{
    foreach (DataRowView dr in BlockStatus.ItemsSource)
        {
        var diff = dr.Row.Field<DateTime>("TimeStarted").Subtract(DateTime.Now);
        if (diff.TotalSeconds > 0)
        {
            dr.Row["Duration"] = string.Format("{0} d {1:D2}:{2:D2}:{3:D2}", diff.Days, diff.Hours, diff.Minutes, diff.Seconds);
        }
        else
        {
            dr.Row["Duration"] = "0 d 00:00:00";
        }
    }
}

我正在尝试在基于另一列的新列中使用mm：ss进行计数。

这是一张图片：