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Posted 26 Aug 2011

A Calculation Engine for .NET

, 1 Sep 2013
A calculation engine that is small, fast, and extensible.
´╗┐Imports System.Collections
Imports System.Reflection
Imports System.Globalization

Public Class Form1

    Public Sub New()

        ' This call is required by the designer.

        ' create calc engine
        Dim ce As New CalcEngine.CalcEngine()

        ' register custom function
        ce.RegisterFunction("Add", 2, AddressOf Add)

        ' test
        Console.WriteLine(ce.Evaluate("Add(420, 123+123)"))

    End Sub

    Private Shared Function Add(ByVal p As List(Of CalcEngine.Expression)) As Object
        Return CDbl(p(0)) + CDbl(p(1))
    End Function

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles _btnEval.Click
        Dim ce As New CalcEngine.CalcEngine()
        _lblResult.Text = ce.Evaluate(_txtExpression.Text).ToString()
    End Sub
End Class

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About the Author

Bernardo Castilho
Chief Technology Officer ComponentOne
United States United States
No Biography provided

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