eval function in vb.net?

[Tony]

Does anyone know how I can do an "eval" on a string?
I have a string back from a database equivalent to "5*6" how can I eval
this to an int type of value 30?
Taking this further, to evaluate custom vb functions ie
eval("5 * AvgPrice('partnum')")

I know about the databind eval function but I am not doing this where I
can use a databinder object

Thanks

Tony

 

[Guest]

You can use the COM library : Microsoft Script Control

more details there : http://www.devx.com/vb2themax/Tip/18773

 

[=?ISO-8859-1?Q?=22Anders_Nor=E5s_=5BMCAD=5D=22?=]

Does anyone know how I can do an "eval" on a string?
I have a string back from a database equivalent to "5*6" how can I eval
this to an int type of value 30?
Taking this further, to evaluate custom vb functions ie
eval("5 * AvgPrice('partnum')")

You can use Reflection.Emit to dynamically generate and execute code on
the fly. See
http://msdn.microsoft.com/library/d...flectionemitilgeneratorclassemitcalltopic.asp
for an example.

Anders Norås
http://dotnetjunkies.com/weblog/anoras/

 

[Scott Allen]

One wayh to do this is to use the JScript engine. See:

http://www.gotdotnet.com/community/messageboard/Thread.aspx?id=212303&Page=1#212576

 

[Tony]

One wayh to do this is to use the JScript engine. See:

http://www.gotdotnet.com/community/messageboard/Thread.aspx?id=212303&Page=1#212576

Thanks, I'll give this a go.

Tony