I have created a custom row summary calculator but do not know how to attach it to a field in the xamDataGrid. I build it and register it in code and then reference it in the xaml as follows:
<igDP:SummaryDefinition
StringFormat=" {0:#,##0.00;(#,##0.00);0.0}"
Key="WorkUnitLaborMult"
SourceFieldName="WorkUnitLaborMult"
Calculator="ProjectEffectiveMult" Position="UseSummaryPositionField"/>
The summary comes up blank when the grid is displayed. Using the debugger I can tell it is not running through the custom calculation class code.
Thank you for your help.
So I figured out that once I register the SummaryCalculator by running through the code that registers, it does not display a value during this first processing. If I exit back to the Project Selection and select the project again, the summary calculation is performed because I did not UnRegister the calculator.
I thought I would prgrammatically set the SummaryCalculator, after registering it, using SummaryCalculator.RegisteredCalculators, so it would be available immediately. However I could not find a way to get a reference to any specific Registered Summary Calculator no less the summary calculator I registered.
The example in the documentation makes it available to be selected but I can't let the users choose the calculations for specific fields I want to set them in xaml or using code. I am going to have to do more of these so some help would be nice.
Thank You.
I did two things in the source code the last time I did this.
1. Register the calculator:
SummaryCalculator.Register(new MyCalculatorClass());
2. Create a property for the calculator.
public static MyCalculatorClass MyCalculatorProperty { get { if (null == _classObject) _classObject= new MyCalculatorClass();
return _classObject; } }
3. In the XAML, I bound the summary field to the property name MyCalculatorProperty, not the class name of the calculator.
There may be other ways of doing this, but that is how I did it.
Thank you for your response. Can I see the xaml you used to do the binding? Here is my xaml:
OLD CODE
<!-- <igDP:SummaryDefinition
Calculator="ProjectEffectiveMult" Position="UseSummaryPositionField"/> -->
USING YOUR METHOD
SourceFieldName="myProjectEffectiveMult"
Position="UseSummaryPositionField"/>
I set a couple of breakpoints. One in the get property that I set up, and one in the BeginCalculation function of the calculator class. I was able to jump into both of those without any problems.
SummaryDefinition:<igDP:SummaryDefinition Key="PerUnit" SourceFieldName="PerUnit" Calculator="{x:Static Pages:BasePositionPage.MyCalculatorProperty}" StringFormat="{}{0:C}"/>
FieldDefinition:<igDP:UnboundField Name="PerUnit" Label="Unit Cost" Column="15" DataType="{x:Type sys:Decimal}" BindingPath="UnitCost" BindingMode="OneWay"></igDP:UnboundField>
What is the right place to register SummaryCalculator and declare its static property if we are using MVVM/PRISM?
Hello Rajib,
You can register your summary calculator in the constructor of the App class, in the App.xaml.cs file.
Hello:
I've followed the following to create a custom summary calculator:
http://community.infragistics.com/wpf/wiki/creating-a-custom-summary-for-the-xamdatagrid/1.aspx
http://help.infragistics.com/Help/Doc/WPF/2013.2/CLR4.0/html/xamDataPresenter_Creating_a_Custom_Summary_Calculator.html
and created a trivial custom calculator. I had the same issue as originally stated in this thread. The calculation will only work on the second invocation.
I followed the static property approach suggested by enderrpf and it works, is this the preferred mechanism?
Not working the first time (bind to class) :
<calculators:MySummaryCalculator x:Key="MySummaryCalculator" />
<igDP:SummaryDefinition SourceFieldName="Total" Calculator="MySummaryCalculator" />
MySummaryCalculator.cs:
public override string Name{ get { return "MySummaryCalculator"; }}
Working (bind to static property):
<igDP:SummaryDefinition SourceFieldName="Total" Calculator="{x:Static calculators:MySummaryCalculator.Addition}" />
public static MySummaryCalculator Addition{ get { return _mySummaryCalculator ?? new MySummaryCalculator(); }}
To register in the view.cs;
private void ViewLoaded(object sender, RoutedEventArgs e){ SummaryCalculator.Register(new MySummaryCalculator());}
Thx