Re: String To Expression - C# Discussion Boards

SeMartens7-Dec-09 22:03

SeMartens

7-Dec-09 22:03

Hi,

Did you tried to use the "InnerText"-property instead of "Value"-property?

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

<<Tash18>>7-Dec-09 22:08

<<Tash18>>

7-Dec-09 22:08

Awesome dude... i was really breaking my head.. thanx alot..
regards,
Thashif

<<Tash18>>7-Dec-09 22:13

<<Tash18>>

7-Dec-09 22:13

Even though my prob is solved can u please tell me why dint it return the value of the child node when used the statement
string ApplicationDescription = node.ChildNodes[1].Value;
I was confused actually....
Regards,
Thashif

SeMartens7-Dec-09 22:19

SeMartens

7-Dec-09 22:19

XmlNode is a base class representing all types of "nodes" within an xml document. So the implementation of "value" doesn't fit for all subtypes. I guess that the nodes you are reading will be represented by XmlElement. For this the "Value"-property is null and you have to use "InnerText" or "InnerXml".

Have a look here at MSDN, where it is described:

http://msdn.microsoft.com/en-us/library/system.xml.xmlnode.value.aspx[^]

Regards
Sebastian

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

<<Tash18>>7-Dec-09 22:24

<<Tash18>>

7-Dec-09 22:24

Thanx alot...

PIEBALDconsult8-Dec-09 7:18

8-Dec-09 7:18

Basically, use InnerText for Elements and Value for Attributes.

String To Expression

Elizma7-Dec-09 21:35

Elizma

7-Dec-09 21:35

Hi Guys and Gals.

I have a simple question, but for the life of me cant find an answer out there.

I have a string that will contain an Expression: string x = "(2+3)+((7*2)-5)";

I need x to execute now as an expression in order to get the result of the expression.

Eg. decimal y = (2+3)+((7*2)-5); [This is the value from the text string x]
Result in y = 14

Your help will be greatly appreciated or your guidance to a possible workable solution.

Kind Regards,

Elizma

OriginalGriff7-Dec-09 22:01

OriginalGriff

7-Dec-09 22:01

Try this[^]

No trees were harmed in the sending of this message; however, a significant number of electrons were slightly inconvenienced.

This message is made of fully recyclable Zeros and Ones

"Rumour has it that if you play Microsoft CDs backwards you will hear Satanic messages.Worse still, is that if you play them forwards they will install Windows"

Elizma7-Dec-09 22:09

Elizma

7-Dec-09 22:09

Thanx for your help! I tried searching for it before I asked the question, but I guess my search criteria was wrong since the I put in "Convert String To Expression".

I found something that works.

E.g.

string x = "(2+3)+((7*2)-5)";
DataTable dt = new DataTable();
object sumObject;
sumObject = dt.Compute(x, "");

Elizma

wenjinxu7-Dec-09 23:00

wenjinxu

7-Dec-09 23:00

use Reverse Polish Notation
Expression can be analyzed
Often used to calculate the string

PIEBALDconsult8-Dec-09 5:11

Find & Replace by using FileAccess.ReadWrite

8-Dec-09 5:11

Reverse Polish Notation[^] and something to make use of it[^].

Or even CodeDom[^].

sonj7-Dec-09 20:06

sonj

7-Dec-09 20:06

Dear All,

I have no. of text files, each file i have to open then find and replace has to do. But i have to update with in the file without create new or append. Let me know how to do.

FileStream fs = new FileStream(infile, FileMode.Open, FileAccess.ReadWrite, FileShare.None);

Thanks in advance
sonj

Message Closed

7-Dec-09 20:27

stancrm

7-Dec-09 20:27

Message Closed

modified 23-Nov-14 6:56am.

Re: Find & Replace by using FileAccess.ReadWrite

sonj7-Dec-09 21:44

sonj

7-Dec-09 21:44

Thanks for quick reply and it is working fine for me

Regards
sonj

Re: Find & Replace by using FileAccess.ReadWrite

PIEBALDconsult8-Dec-09 7:42

8-Dec-09 7:42

sonj wrote:
without create new or append

That sounds like requirements from a homework assignment; not a real-world requirement.

Reading and writing directly from an existing file will only work if the resultant file doesn't increase in size.

Connect to Database

Nastaran_daneshnia7-Dec-09 20:03

Nastaran_daneshnia

7-Dec-09 20:03

how can connect to database (c# and Sql server)?
how cane change my background image with open file dialog?
My Email : Daneshnia_nastaran@yahoo.com

Message Closed

7-Dec-09 20:16

stancrm

7-Dec-09 20:16

Message Closed

modified 23-Nov-14 6:57am.

Re: Connect to Database

dan!sh 7-Dec-09 21:00

dan!sh

7-Dec-09 21:00

stancrm wrote:
Do you want to get some SPAM ??..

If that makes you happy, well, go ahead send some. Poke tongue | ;-P

50-50-90 rule: Anytime I have a 50-50 chance of getting something right, there's a 90% probability I'll get it wrong...!!

Re: Connect to Database

PIEBALDconsult8-Dec-09 5:15