Hello!
I have a grid that is filled with different types of products. One column in this grid is a cost price column.
I have added summaries to the grid and my idea was to get the total price of the products through the summary value that is based on the cost price column.
Another option could be to calculate the total price based on the datasource that populates the grid, but since I have enabled editing of the grid, it feels a bit wrong.
At the moment, I am setting the cost price in the summaryvaluechanged event, which then calculates the sales price. So we have:
summaryvaluechanged->costprice->salesprice.
The summaryValueChanged event fires many times, since I have groupbyrows. However, it works even if it is fired many times.
So far so good...
It is quite common that the users wants to override the sales price and create some sort of rounded value that is presented to the customer.
The problem that I get is when I export the data from the grid to excel. The grid seems to be re-generated when it is exported, so the summaryvaluechanged event fires a new round. This means that the cost price is calculated again, and so is the sales price. It gets overwritten which is not good. I ahve tried to lock down the event before i export the grid and to open it up again after it is exported. However, since the grid works async, I turn on the event before the summaryvaluechanged event has finished firing. So the value is overwritten...
I hope that someone can understand what I am trying to explain. I am not sure if I understand it myself ;-)
Any ideas?
/Henrik
Hello Henrik,Thank you for posting in our forum.Without providing me a sample solution I cannot be quite sure what exactly you are trying to achieve. However from your post I understand that you have an issue while exporting the grid to Excel. Please note that when the export starts the exporter creates a copy of the Layout. So one possible solution to your issue could be if you check in SuumaryValueChanged event handler if the event was fired by the exported layout. You can use code like this:private void ultraGrid1_SummaryValueChanged(object sender, SummaryValueChangedEventArgs e){ if (e.SummaryValue.ParentRows.Band.Layout.IsExportLayout) { return; }}Please let me know if this solves your issue. If note please try to isolate this behavior in small sample solution and send it to me in order to be able to research a possible solution for you. Looking forward to your reply.
thanks, that could be really useful. by the way, is there some sort of way finding out when the top level summary value changed event is fired? that could be useful as well. then i can handle that one only...
Hello Henrik,
Thank you for your feedback.
If I understand you correctly you need to check if the SummaryValueChanged event was fired when a summary value of the top level band was changed. In order to achieve this you may check if the parent band of the affected summary value’s band is null. If so this is the top level band. You can use code like this:
if (e.SummaryValue.ParentRows.Band.ParentBand == null)
{
// TODO: implement your logic here
}
Please let me know if you need any further assistance.
When it comes to finding out which is the top level SummaryValue, I used the code below. It seems to work:
If e.SummaryValue.ParentRows.ParentRow Is Nothing Then
...
End If
So we can drop that question and focus on the export issue.
Let me know if you get any ideas of that.
I followed the steps you suggested and was unable to reproduce the behavior you're describing. In my sample the grid has three numeric columns – Quantity, Price and Total. Initially Total column value is equal to the product of the Quantity and Price. I have add summary to the Total column. If the user changes the value of the Total in SummaryValueChanged event handler a new value for the Price column is calculated. With all these settings when I change some Totals and export the grid all the numbers in the exported Excel worksheet are correct. During the export several times IsExportLayout property returns true (please check the Output window after Export to Excel button was clicked).
I have attached the sample project I used to test this. Please test this project on your PC; whether or not it works correctly may help indicate the nature of this issue.
If this sample project is not an accurate demonstration of what you're trying to do, please feel free to modify it and send it back, or send a small sample project of your own if you have one.
Please let me know if I can provide any further assistance.
Thanks!
I tried your code and it works as you mentioned.
When you export, the event is called once with the correct value for isexportlayout. When I try it onmy grid, the event is fired many times and one had a the right value for isexportlayoyt(true), but the rest of the calls were with the value of false.
Really strange...
I found some differences in my code compared to yours, so I updated yours. Now it works as mine.
Please have a look at it.
The SummaryEvent is fired many times and the value of isexportlayour differs...
Thank you for the sample provided.
When you start the export the grid layout recalculates all the formulas. This recalculation fires several times SummaryValueChanged event. When the recalculation is finished the exporter creates a clone of the grid layout. During this process SummaryValueChanged is called again this time on ExportLayout. This is why in your sample SummaryValueChanged is called several times from the grid layout and then some more times by the export layout.
In my sample summary values are not calculated via UltraCalcManager and this is why SummaryValueChanged is called less times than in your code.