If you are trying it on ADO.NET 2.0, why not trace it with the new tracing facility? It traces DataSet activity too.
Bob -----Original Message----- From: Unmoderated discussion of advanced .NET topics. [mailto:[EMAIL PROTECTED] On Behalf Of Chris Howlett Sent: Wednesday, June 01, 2005 4:19 AM To: [email protected] Subject: Re: [ADVANCED-DOTNET] ADO.NET Expression Columns - Aggregates of Aggregates That looks like an effective workaround. I'll try it. Thanks a lot Sebastien. Chris > -----Original Message----- > From: Unmoderated discussion of advanced .NET topics. [mailto:ADVANCED- > [EMAIL PROTECTED] On Behalf Of Sebastien Lorion > Sent: June 1, 2005 1:56 AM > To: [email protected] > Subject: Re: [ADVANCED-DOTNET] ADO.NET Expression Columns - Aggregates of > Aggregates > > We got the same behavior while working on a project using ADO.NET 1.1. I > don't know if it is fixed in .NET 2.0 or if it will stay the same "by > design". We got around using the hack below. We tried several alternatives > and it seems that only this one is bulletproof. > > public static void RefreshExpressionColumns(DataRow row, bool cascade) { > if (row == null) > throw new ArgumentNullException("row"); > > if (!cascade) > RefreshExpressionColumns(DataRow row); > else > { > int count = row.Table.ParentRelations.Count; > > for (int i = 0; i < count; i++) > { > DataRow[] parents = > row.GetParentRows(row.Table.ParentRelations[i]); > > for (int j = 0; j < parents.Length; j++) > { > DataRow parent = parents[j]; > > RefreshExpressionColumns(parent); > RefreshExpressionColumns(parent, true); > } > } > } > } > > > public static void RefreshExpressionColumns(DataRow row) { > if (row == null) > throw new ArgumentNullException("row"); > > switch (row.RowState) > { > case DataRowState.Unchanged: > row.BeginEdit(); > row.EndEdit(); > row.AcceptChanges(); > break; > > case DataRowState.Modified, DataRowState.Added: > row.BeginEdit(); > row.EndEdit(); > break; > } > } > > S�bastien > > > > -----Original Message----- > From: Chris Howlett [mailto:[EMAIL PROTECTED] > Sent: Tuesday, May 31, 2005 9:46 PM > Subject: ADO.NET Expression Columns - Aggregates of Aggregates > > Say you have an expression column which is an aggregate of child columns > which are in turn aggregates of child columns. It appears to me that when > you modify the lowest level values, the aggregates are recomputed one > level up, but not two levels up. Is this the expected behaviour? I haven't > been able to find anything on it in the docs, this list's archives, or > google. > A specific example, in case the above isn't clear. A dataset with three > tables - companies, offices, employees. office rows are children of > company rows, employees are children of office rows. employees have a > sales column, a number. Offices have a sales column, an expression column > which is the sum of the child employees sales. Companies have a sales > column, an expression column which is the sum of the child office sales. > Create an empty such dataset. Add a company, an office for the company and > an employee for the office. Set the employee sales to 5. > Then the office sales will be 5, but the company sales will be null. In > general, the office sales respond to changes in employee sales as you'd > expect, but company sales do not. If you reassign the expression value for > company sales to itself at any point, it will recompute correctly. > Interesting but not really helpful. > This is 1.1, I haven't tried 2.0. > Can anyone offer any insight or pointers to any place where this is > discussed? > > Thanks, > > Chris > > =================================== > This list is hosted by DevelopMentor� http://www.develop.com > <http://www.develop.com> > > View archives and manage your subscription(s) at > http://discuss.develop.com <http://discuss.develop.com> > > > > > =================================== > This list is hosted by DevelopMentor� http://www.develop.com > > View archives and manage your subscription(s) at > http://discuss.develop.com =================================== This list is hosted by DevelopMentor� http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com =================================== This list is hosted by DevelopMentor� http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com
