Working with custom calculation engine for GridJs

Implement Custom Calculation Engine

Aspose.Cells.GridJs has a powerful calculation engine that can calculate almost all of the Microsoft Excel formulas. Despite this, it also allows you to extend the default calculation engine which provides you greater power and flexibility.

The following property and classes are used in implementing this feature.

• GridAbstractCalculationEngine
• GridCalculationData

The following code implements the Custom Calculation Engine. It implements the interface GridAbstractCalculationEngine which has a Calculate(GridCalculationData data) method. This method is called against all of your formulas. Inside this method, we capture the MYTESTFUNC formula and multiply by 2 for its first parameter value .

Programming Sample

class MyCalculation : GridAbstractCalculationEngine
        {
           public override void calculate(GridCalculationData data)
            {
                if (!"MYTESTFUNC".Equals(data.FunctionName.ToUpper()))
                {
                    return;
                }
                data.CalculatedValue = (decimal)(2.0 * (double)data.GetParamValue(0));
            }
        }
// in the startup.cs when you do initialization ,set the CalculateEngine		
  MyCalculation ce = new MyCalculation();
  GridJsWorkbook.CalculateEngine = ce;