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You could try using File.ReadAllLines[^] which returns an array of data from your file.
If you want to refer to specific line (for example 3 as in your post) you would simply use ...yourvariable[2]...
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this means you want to read the value from line X?
you may implement a helper method wich takes the StreamReader and returns the value contained in a file at line X. use a loop to skip the lines and count them.
Calin
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If you want a value from the specific line, you can simply count the lines and use the value from the correct one. Just like this:
string line;
int current_line = 0;
int desired_line = 3;
while ((line = r.ReadLine()) != null)
{
current_line++;
if(current_line == desired_line)
{
lines.Add(line);
break;
}
}
This is just a sample logic. I hope you can use something like that for your case.
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To comment on this post, I'd write this code a little different and smaller, like this.
It maybe is just my style, but I think it's better:
int desired_line = 3;
for(int current_line = 0, string line; (line = r.ReadLine()) != null; current_line++)
{
if(current_line == desired_line)
{
lines.Add(line);
break;
}
}
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thanks for replies
t1.txt is:
11
22
33
44
55
.
.
how can I get x value? x=a(line's 1 value)+b(line's 3 value)+c(line 5)that is c must 99
using System;<br />
using System.IO;<br />
<br />
class MainClass<br />
{<br />
public static void Main(string[] args)<br />
{<br />
try<br />
{<br />
FileStream fs = new FileStream("c:\\t1.txt", FileMode.Open);<br />
StreamReader sr = new StreamReader(fs);<br />
<br />
string line = "";<br />
<br />
int lineNo = 0;<br />
do<br />
{<br />
line = sr.ReadLine();<br />
if (line != null)<br />
{<br />
Console.WriteLine("{0}: {1}", lineNo, line);<br />
lineNo++;<br />
x=a+b+c;-------->values=?<br />
}<br />
} while (line != null);<br />
}<br />
catch (Exception e)<br />
{<br />
Console.WriteLine("Exception in ShowFile: {0}", e);<br />
}<br />
}<br />
}
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First of all: use the pre tag, it's better than the code tag.
Secondly it is not as tough as you think. Just use common sense for this question:
You are using the do while construction, but if I where you, I should use the while function or for function.
List<string> lines = new List<string>();
String line;
while((line = sr.ReadLine()) != null)
{
lines.Add(line);
}
try
{
int numberOne = Int32.Parse(lines[0]);
int numberThree = Int32.Parse(lines[2]);
int numberFive = Int32.Parse(lines[4]);
int x = numberOne + numberThree + numberFive;
}
catch {}
</string></string>
You could use the TryParse method, but you can also use the try catch block.
Good luck!
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wonderful
thank you very much
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Hi!
I have a world map in my GUI and I want the countries to highlight when mouse hovers over a country. Something like this http://www.netzgesta.de/mapper/
Is this possible to do this with c# at all?
I have read about the Imagemap controller with which it is possible to do polygon hotspots, but I'm not sure this is exactly what I need. It can't change anything within the coordinates of the polygon when mouse hovers over the hotspots.
Can someone give me a clue what to do?
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LMAO! Just posted the exact same link 
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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Yes, but it doesn't have that hover effect.
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So use it as a base and program the hover effect yourself.
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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There's an article here[^] that might help
DaveBTW, in software, hope and pray is not a viable strategy. (Luc Pattyn)Visual Basic is not used by normal people so we're not covering it here. (Uncyclopedia)
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hello,
I would stock a list of string, i make this
<br />
string[] TableauString;<br />
<br />
TableauString[tt]= (nom.Trim() + ";" + prenom.Trim() + ";" + adresse1.Trim() + ";" + cp.Trim() + ";" + ville.Trim() + resultat3.Trim() + resultat2.Trim());<br />
tt++;<br />
<br />
there are exception : the referce is not instance of obkect, help me please to resolve this problem, thank you verry mutch
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The exception occurs because you don't allocate any memory for the string array. Try something like this:
string[] TableauString = new string[10];
Here i allocate a memory for 10 elements. This is only an example. You have to specify correct size for the array depending on your needs.
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If i don't know the size of my elements?? thank you verry mutch
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You can use the code as shown bellow just replace
"The Size" with an int number
TestArray= Array.CreateInstance(typeof(String),"The Size");
this will create a array based on the size that you want
hopes this helps
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Then you can use ArrayList. Here is a sample code:
using System.Collections;
........
ArrayList myList = new ArrayList();
myList.Add(new string(" Here is your string "));
for(int i=0; i<5; i++)
myList.Add(new string(" Here is your string "));
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When i declare array list, this error appear : Erreur 1 The type or namespace name 'ArrayList' could not be found (are you missing a using directive or an assembly reference?) C:\Documents and Settings\Administrateur\Mes documents\Visual Studio 2005\Projects\Form@Home1.0\WindowsApplication2\Form1.cs 20 83 WindowsApplication2
Thank you verry mutch
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You have to insert the next "using" directive at the top of your source file:
using System.Collections;
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Thank you verry mutch, i would use this to read from mylist :
foreach (Array ee in myList) {MessageBox.Show(ee)} , bu there are an exception, thank you verry mutch
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The type of "ee" must be string, not an Array. Use this:
foreach (string ee in myList) {MessageBox.Show(ee)}
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i try for foreach (Object obj in myList), and it work, what is the difference between Object and String ?? thank you verry mutch.
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abbd wrote: there are an exception
That's because there is an error.
If you tell which exception, I can tell you which error.
Well, in this case I can actually tell you anyway. You are reading the items as if they were arrays, but they are strings.
foreach (object ee in myList) { MessageBox.Show((string)ee); }
Unless you are stuck with framework 1, you should use a List<string> instead of ArrayList, so that you don't have to cast every item to string when reading from the list.
Despite everything, the person most likely to be fooling you next is yourself.
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