C# Discussion Boards - CodeProject

ddecoy15-Dec-09 1:45

ddecoy

15-Dec-09 1:45

You can split a string like this:

string[] ArrayOfStrings;
string s = "AD0001-AD0002-AD0003";
ArrayOfStrings = s.Split('-');

For the rest I not sure what u mean...

Learning without thought is labor lost; thought without learning is perilous. (Confucius)

OriginalGriff15-Dec-09 0:36

OriginalGriff

15-Dec-09 0:36

Use an explicit format string when you print the int:

int i = 6461;
Console.Writeline(i);
Console.WriteLine(i.ToString("D5"));

will print:

6461
06461

All those who believe in psycho kinesis, raise my hand.

spalanivel15-Dec-09 0:45

spalanivel

15-Dec-09 0:45

Thanks for your quick response.

But one question how to get the final value as a integer rather than string. Any Other Option?

int iResult = 06461; /// Output.

REg,
Sbubbu

OriginalGriff15-Dec-09 0:53

OriginalGriff

15-Dec-09 0:53

Oh boy.

An integer is a number. Like any number, it can have an infinite number of zeros in front of it. Take your house, or flat number - let us say it is six, and the address is Lemon Street. You live at 6 Lemon street. You also could say "I live at 0000006 Lemon Street, and your letters would still arive - but the postman might think you are a little wierd.

You can happily tell Visual studio:

int i = 000000000006461;

int i = 6461;

int i = 0006461;

etc., etc. They all mean the same.
A string representation of a number is more like a telephone number: "0123 456789" is a different number to "123 456789" because the exchange will not see it as having an area code, as the leading zero is missing. But, you cannot add two telephone numbers together!

All those who believe in psycho kinesis, raise my hand.

Wrong forum

dan!sh 15-Dec-09 1:16

dan!sh

15-Dec-09 1:16

This is not mathematics forum. 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: Wrong forum

Luc Pattyn15-Dec-09 1:35

Luc Pattyn

15-Dec-09 1:35

we no longer have a math forum, so math goes everywhere. Poke tongue | ;-P

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

Re: Wrong forum

dan!sh 15-Dec-09 1:42

dan!sh

15-Dec-09 1:42

Luc Pattyn wrote:
math ~~goes~~ is everywhere

FTFY

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...!!

#realJSOP15-Dec-09 3:49

#realJSOP

15-Dec-09 3:49

You can't. It's impossible.

.45 ACP - because shooting twice is just silly
-----
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"The staggering layers of obscenity in your statement make it a work of art on so many levels." - J. Jystad, 2001

#realJSOP15-Dec-09 3:48

#realJSOP

15-Dec-09 3:48

string.format("{0:00000}", value);

Download first and last 1000 kb of a file?

Luc Pattyn15-Dec-09 1:39

Luc Pattyn

15-Dec-09 1:39

two comments:

1.

spalanivel wrote:
Output : 6461 (note 0's missing)

yes, sure. and how many zeroes are missing? 1? one hundred?

2.

you could (I don't say "should") do what you want with strings and characters, i.e. come up with a method that "increments a string". This is how it would go:

a. copy the original string;
b. look for the rightmost digit that you haven't processed yet;
c. add one to it i.e. replace '0' by '1', or '1' by '2', etc
d. if in step c you replaced '9' by '0' then goto b
e. done

with possible refinement: if b fails, prefix a '1'

Smile | :)

Luc Pattyn [Forum Guidelines] [Why QA sucks] [My Articles]

I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages

jafingi14-Dec-09 23:46

jafingi

14-Dec-09 23:46

Hi
Can anyone tell me how I can download the first 1000 kb and last 1000 kb of a file in C#?

When downloaded, the file should just be deleted.

Have no clue on how to do this.

Thanks in advance

Re: Download first and last 1000 kb of a file?

Eduard Keilholz14-Dec-09 23:56

Eduard Keilholz

14-Dec-09 23:56

You can open the file using a stream and read the first and last 1000 Kb of the file. You can store that data in a seperate file.

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

Re: Download first and last 1000 kb of a file?

jafingi15-Dec-09 0:05

jafingi

15-Dec-09 0:05

I don't need to store the data - actually, the downloaded bytes should just be deleted afterwards.

Thought about doing something like this:
reader.ReadBytes(1000); reader.Position = (file.Length - 1000); reader.ReadBytes(1000);

Would that work? And what is the file is smaller than 1000kb?

Re: Download first and last 1000 kb of a file?

Eduard Keilholz15-Dec-09 0:47

Eduard Keilholz

15-Dec-09 0:47

If the stream is seekable, you're pretty close.

I think, if the stream is smaller than 2000 Kb you should read the entire file? Else you would copy duplicate data and (if the file is less than 1000 Kb) cause an exception.

.: I love it when a plan comes together :.
http://www.zonderpunt.nl

report viewer

Member 59031014-Dec-09 23:13

Member 590310

14-Dec-09 23:13

i added a report viewer control to my project and selected 2 columns from database table..now i want to add my own custom column in report.hw can i do that?

Mathematical Expressions from strings.

Randal Vance Cunanan14-Dec-09 22:53

Randal Vance Cunanan

14-Dec-09 22:53

Hello guys.

I would like to know how to extract the mathematical
expression from a string and compute the result.

Sample: The user will type 5 + 2 - 3 * 4 which will be in a string format.

Then the result will be assigned to a double variable.

Also, the user can include parenthesis in the expression: 5 + (3 / 9)

Thanks a lot.

Migounette14-Dec-09 23:02

Migounette

14-Dec-09 23:02

In fact you can have a simple to a more complete solution...

Parsing grammar is based on definitions, for instance BNF, ABNF...
In your case, you can write a simple peace of code in order to have your expression parsed.

But if you want to have a more complexe handling use this pointer and check the section 7.2

[^]

Please update us.

Alan Balkany15-Dec-09 3:59

Alan Balkany

15-Dec-09 3:59

One approach is to put the expression in a binary tree with numbers (or variables) at the leaves and operators at the interior nodes. Replace higher-precedence operators (and parenthesized expressions) with subtrees first.

To evaluate, do a postorder traversal, applying the operator at each interior node to the values obtained from its two subtrees.

When you're done, the result will be in the root node.

PIEBALDconsult15-Dec-09 4:37

PIEBALDconsult

15-Dec-09 4:37

Hmmm... looks like a teacher assigned an RPN assignment yesterday.

See my response here[^].

BillWoodruff15-Dec-09 11:01

BillWoodruff

15-Dec-09 11:01

I think without explicity declaring the order of precedence of operator execution ... i.e. : is this infix, postfix, RPN ? ... you cannot begin to respond to this question.

There are some math expression "parser" articles around CodeProject; try this one : [^].

best, Bill

"Many : not conversant with mathematical studies, imagine that because it [the Analytical Engine] is to give results in numerical notation, its processes must consequently be arithmetical, numerical, rather than algebraical and analytical. This is an error. The engine can arrange and combine numerical quantities as if they were letters or any other general symbols; and it fact it might bring out its results in algebraical notation, were provisions made accordingly." Ada, Countess Lovelace, 1844

DataGridView Delete Slow

stancrm14-Dec-09 22:36

stancrm

14-Dec-09 22:36

Hello.

I have a DataGridView with 3 Columns and 100000 Rows.
If I select all rows and press "Del" keys from keyboard,
then it takes too long to delete all of them.
Are there anyways to improve the performance ?

Thanks.

Eddy Vluggen14-Dec-09 22:47

Eddy Vluggen

14-Dec-09 22:47

The grid is updating, and repainting. A lot Smile | :)

You can temporarily disable drawing using the SuspendLayout[^] method, and turn it back on using ResumeLayout.

I are Troll Suspicious | :suss:

Migounette14-Dec-09 22:56

Migounette

14-Dec-09 22:56

In fact the suspend layout will not help on this issue.
You must use a virtual mode in order to avoid such redraw issue.

Look at this all is in....

[^]

Eddy Vluggen15-Dec-09 0:16

Eddy Vluggen

15-Dec-09 0:16

Migounette wrote:
In fact the suspend layout will not help on this issue.

I had to check to verify that, and it seems that you are right.

+5 Smile | :)

I are Troll Suspicious | :suss: