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How to calculate formula using ComputeFormulaValueAt method in WinForms GridGroupingControl?

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Calculate formula using ComputeFormulaValueAt method


By default, the arithmetic operations cannot be parsed in Expression fields. It can be achieved by defined methods manually like SUM,MUL,SUB… and adding those methods to the library function. So that we can use these methods to perform the arithmetic operations. By this way, any of the methods can be added for customization to calculate the values.

C#

ExpressionFieldEvaluator fieldEval;
fieldEval = this.gridGroupingControl1.TableDescriptor.ExpressionFieldEvaluator;
fieldEval.AddFunction("Sum", new Syncfusion.Grouping.ExpressionFieldEvaluator.LibraryFunction(Sum));
fieldEval.AddFunction("Sub", new Syncfusion.Grouping.ExpressionFieldEvaluator.LibraryFunction(Sub));
fieldEval.AddFunction("Mul", new Syncfusion.Grouping.ExpressionFieldEvaluator.LibraryFunction(Mul));
 
//Method for sum operation
private string Sum(string argument)
{
   string[] arg = argument.Split(',');
   int result = 0;
   foreach (string str in arg)
   { 
      result += Convert.ToInt16(str); 
   }
   return result.ToString();
}
 
//Expression for compute the formula
MessageBox.Show(fieldEval.ComputeFormulaValueAt(((IExpressionFieldEvaluator)fieldEval).Parse(this.textBox1.Text, true)));

VB

Dim fieldEval as ExpressionFieldEvaluator
fieldEval = Me.gridGroupingControl1.TableDescriptor.ExpressionFieldEvaluator;
fieldEval.AddFunction("Sum", new Syncfusion.Grouping.ExpressionFieldEvaluator.LibraryFunction(Sum))
fieldEval.AddFunction("Sub", new Syncfusion.Grouping.ExpressionFieldEvaluator.LibraryFunction(Sub))
fieldEval.AddFunction("Mul", new Syncfusion.Grouping.ExpressionFieldEvaluator.LibraryFunction(Mul))
 
'Method for sum operation
Private Function Sum(ByVal argument As String) As String
   Dim arg() As String = argument.Split(","c)
   Dim result As Integer = 0
   For Each str As String In arg
       result += Convert.ToInt16(str)
   Next str
   Return result.ToString()
End Function
 
'Expression for compute the formula
MessageBox.Show(fieldEval.ComputeFormulaValueAt((CType(fieldEval, IExpressionFieldEvaluator)).Parse(Me.textBox1.Text, True)))

The ScreenShot below illustrates the computed value


Show calculate the formula


Samples:

C# : compute Formula At_CS

VB : compute Formula At_VB

 

Conclusion

I hope you enjoyed learning how to calculate formula using ComputeFormulaValueAt method in WinForms GridGroupingControl.

You can refer to our WinForms GridGroupingControl’s feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms GridGroupingControl documentation to understand how to present and manipulate data. 

For current customers, you can check out our WinForms components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our WinForms GridGroupingControl and other WinForms components. 

If you have any queries or require clarifications, please let us know in comments below. You can also contact us through our support forumsDirect-Trac, or feedback portal. We are always happy to assist you!

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