Question

我有以下代码，其中有一个要绑定到DataGrid的DataTable。如果SelectedLot不为null，则将数据添加到DataTable中，并正确显示数据。但是，如果SelectedLot为null，我想显示其中包含“无”字符串的空白行。出于某种原因，当我调试它时，它明确表示其中有一行，但没有显示在DataGrid中。请帮忙。

DataTable的代码

(defn gen-frame [num-pixels]
  (repeatedly num-pixels
    #(->Pixel (rand-int 256) (rand-int 256) (rand-int 256) (rand-int 256))))    
(defn frame-op [frame] ;; not very interesting for random pixels
  (let [num-pixels (count frame)
        avg #(double (/ (apply + (map % frame)) num-pixels))]
    (->Pixel (avg :r) (avg :g) (avg :b) (avg :a))))    
(time
  (->> (repeatedly #(gen-frame (* 1920 1080)))
       (map frame-op)
       (take 60)
       (doall)))
"Elapsed time: 240527.803662 msecs"
=>
(#sandbox.core.Pixel{:r 127.4540152391975, :g 127.4542722800926, :b 127.3754962384259, :a 127.4886294367284}
 #sandbox.core.Pixel{:r 127.4727488425926, :g 127.4447955246914, :b 127.4472164351852, :a 127.4626080246914}
 ...

Xaml

public void PopulateLotDataTable(PlateSetupViewModelEx2 plateViewModel)
{
    try
    {
        if (LotInformationDataTable == null)
        {
            LotInformationDataTable = new DataTable();
        }
        LotInformationDataTable.Columns.Add(WinApp.Current.TryFindResource("LotType").ToString());
        LotInformationDataTable.Columns.Add(WinApp.Current.TryFindResource("CatalogNumber").ToString());
        LotInformationDataTable.Columns.Add(WinApp.Current.TryFindResource("SupermixColumnHeader").ToString());
        LotInformationDataTable.Columns.Add(WinApp.Current.TryFindResource("LotNumber").ToString(), typeof(string));
        DataRow dr = null;
        var SelectedLot = plateViewModel.PlateSetupToUse.GetAllWellSamples().Values.FirstOrDefault(x => x.SelectedLots != null);
        if (SelectedLot != null)
        {
            foreach (var item in SelectedLot?.SelectedLots)
            {
                foreach (var subitem in item?.KitLots)
                {
                    dr = LotInformationDataTable.NewRow();
                    dr[0] = EnumExtensions.ToDescriptionString(item.KitLotType);
                    dr[1] = subitem.CatalogNumber;
                    dr[2] = subitem.Supermix;
                    dr[3] = subitem.LotNumber;
                    LotInformationDataTable.Rows.Add(dr);
                }
             }
         }
         else
         {
             dr = LotInformationDataTable.NewRow();
             LotInformationDataTable.Rows.Add(dr);
             for (int i = 0; i < LotInformationDataTable.Columns.Count; i++)
             {
                 LotInformationDataTable.Rows[0][i] = WinApp.Current.TryFindResource("None").ToString(); //This is not working I guess.
             }
             Debug.Write(LotInformationDataTable.Rows.Count);
        }
    }
    catch(Exception ex)
    {
        SystemDebugLogLogger.LogException(ex);
    }
}

Answer 1

在else部分尝试：

dr = LotInformationDataTable.NewRow();

// First add data in empty row
for ( int i = 0; i < LotInformationDataTable.Columns.Count; i++ )
{
    dr[i] = WinApp.Current.TryFindResource( "None" ).ToString();
}

// Notify UI by adding row in collection.
LotInformationDataTable.Rows.Add( dr );

Debug.Write( LotInformationDataTable.Rows.Count );

我猜在您在DataGrid中添加行之后添加数据时，DataSource的{{1}}没有得到通知

单行数据表不会显示在DataGrid中

1 个答案: