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Using Multiple Columns in Custom Summaries in GridGrouping Control

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17230 Aug 4,2004 03:17 AM Mar 23,2006 12:55 AM Windows Forms 4
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Tags: GridControl
Administrator [Syncfusion]
Asked On August 4, 2004 03:17 AM

Hi, I''m trying to create a custom summary that provides a weighted average. In the ISummary:CreateSummaryMethod() of my custom summary implementation I need way of accessing a field that isn''t the field being summarized. Is it possible to do this? Thanks, Ben.

Administrator [Syncfusion]
Replied On August 4, 2004 07:54 AM

Hi Ben, you can access any field (or multiple fields) from the record. See this example: public static ISummary CreateSummaryMethod(SummaryDescriptor sd, Record record) { object obj = record.ParentTableDescriptor.Fields["Weight"].GetValue(record); // -or - // you could also access values from outside the table here, e.g. a external table // of weights. You only need to make sure then that if you change values in the external table // that you then call InvalidateSummariesTopDown on the grids Table object. bool isNull = (obj == null || obj is DBNull); if (isNull) return Empty; else { double val = Convert.ToDouble(obj); return new TotalSummary(val); } } Stefan

Administrator [Syncfusion]
Replied On August 6, 2004 02:00 AM

Hi Stefan, Implemented this and it does exactly what I need. Many thanks, Ben.

Mohammed Sharikh
Replied On March 22, 2006 04:30 AM

Hi, Could you please post the implementation of the weighted average custom summary? I am having problems getting it to work because the docs don''t describe how to use custom summary delegates.. >Hi Stefan, > >Implemented this and it does exactly what I need. > >Many thanks, > >Ben.

Administrator [Syncfusion]
Replied On March 23, 2006 12:55 AM

Hi Mohammed, I am sorry for the delay in responding. Attached is a sample that implements the Weighted Mean Custom Summary. Let us know if you have any further queries. Regards, Calvin.

17230.zip

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