Convert Text formula into value

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I have one string in which I have written some formulas for calculation. Eg.

Dim strFormula(3) as string 
strFormula(0) = "(txtBasic.Text) * 2"
strFormula(1) = "((txtBasic.Text) + (txtBasic.Text)) * 2"
strformula(2) = "((txtBasic.Text) * 10) /2)"

Now by using this formula I have to get the result from textbox name "txtBasic".

Is there any way that I can directly convert string into formula or value?

Posted 22-Aug-10 20:09pm

shukla dhaval

Updated 22-Aug-10 22:35pm

Dalek Dave

v2

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GPUToaster™ 23-Aug-10 2:15am

Why not use Integer.Parse or double.parse??

Dalek Dave 23-Aug-10 4:34am

Minor Edit for Grammar.

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Wayne Gaylard · Answer 1 · 2010-08-22T21:55:00

Why not just use a Select Case like this :

VB.NET

Dim intToCalculate As Integer = 0
        Integer.TryParse(txtBasic.Text, intToCalculate)
        Select Case cboSelect.SelectedIndex 'use appropriate selector here
            Case 0
                txtResult.Text = intToCalculate * 2
            Case 1
                txtResult.Text = (intToCalculate * 2) * 2
            Case 2
                txtResult.Text = (intToCalculate * 10) / 2
        End Select

If you need to use it in more than one place then create a function like this:

VB

Enum FormulaType
       Formula1
       Formula2
       Formula3
   End Enum

   Private Function FormulaResult(ByVal intToCalculate As Integer, ByVal yourFormulaType As FormulaType) As Integer

       Dim intReturn As Integer = 0
       Select Case yourFormulaType
           Case FormulaType.Formula1
               intReturn = intToCalculate * 2
           Case FormulaType.Formula2
               intReturn = (intToCalculate * 2) * 2
           Case FormulaType.Formula3
               intReturn = (intToCalculate * 10) / 2
       End Select
       Return intReturn

   End Function

Hope this helps.
Happy Coding :)