How to execute a line of code in string format in vb.net

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Hi
i have a code to call a method is like below

VB

dim r as integer
 r = Add(a,b)

i need to change the method Add instead subtract or multiplication etc.. so that i have store all method names in database and load that method names to Combobox at runtime
then i have form code in string format like below

VB

dim str as string
str="r=" & Combobox1.selectedItem & "(a,b)"
// combobox1.selectedtext is Add 
//and str is Add(a,b)

now i need execute/evalute the above line
plz give suggestions.....

thanks in advance

Posted 12-Apr-12 0:30am

gopi1987

Updated 12-Apr-12 1:30am

P.Salini

v2

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Nilesh Patil Kolhapur · Answer 1 · 2012-04-12T01:27:00

hey

try following

VB

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
       MessageBox.Show(Calculate(ComboBox1.SelectedItem, 10, 5).ToString())
   End Sub

   Private Function Calculate(ByVal functionName As String, ByVal a As Integer, ByVal b As Integer) As Integer

       If functionName = "Add" Then
           Return a + b
       ElseIf functionName = "Minus" Then
           Return a - b
       Else
           Return a / b
       End If

   End Function

Best Luck

Reza Ahmadi · Answer 2 · 2012-04-12T01:02:00

Solution 1

Hi,
One powerful way is to use CodeDOM. Take a look at these post to find out about CodeDOM:
Dynamic Code Generation Using CodeDOM[^]
Compiling with CodeDom[^]

I hope it helps,
Cheers

Posted 12-Apr-12 1:02am

Reza Ahmadi