Custom DataGrid Aggregate refresh issue

Custom DataGrid Aggregate refresh issue

Posted by: abellisomi on 20 January 2020, 10:10 am EST

• 

  abellisomi

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  Posted 20 January 2020, 10:10 am EST

  I am trying to get a custom

  DataGridAggregate

  Implementation. I implemented a class such as:

  
      public class MyDataGridAggregate : DataGridAggregate
      {
          public override object Compute(DataGridRowCollection rows, DataGridColumn column, bool recursive)
          {
              var items= rows.As<DataGridRowCollection>().ToList().Select(x => x.DataItem).OfType<MyModel>().Select(pd => pd.InterestingField).Distinct().ToList();
              return string.Join(@",", items);
          }
      }
  
  

  This gets attached to a

  DataGridTextColumn

  this way:

  
  <c1:DataGridTextColumn Binding="{Binding SomeName}">
                                          <c1:DataGridAggregate.AggregateFunctions>
                                              <c1:DataGridAggregatesCollection>
                                                  <planDetail:MyDataGridAggregate ResultFormat="D = {0}"/>
                                              </c1:DataGridAggregatesCollection>
                                          </c1:DataGridAggregate.AggregateFunctions>
                                      </c1:DataGridTextColumn>
  
  

  The custom aggregator gets called correctly, however the group row value does not get refreshed when I update the underlying data of

  InterestingField

  . How can make sure this happens correctly?

  Thank you

• 

  Ruchir.Agarwal

  

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  Posted 20 January 2020, 11:45 pm EST

  Hello,

  Are you implementing INotifyPropertyChanged in your model? I don’t find anything else that could cause this issue for you. For your verification, I have prepared an application, kindly refer the same.

  Best wishes,
  
  Ruchir
  
  DataGridSamples.zip