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Hello!
Can anyone help me in the following scenario:
- We need to insert multple comma notations in a string (25 in total), at a predefined index number.
- Currently we are 25 inserts as below:
line = line.Insert(7, ",");
line = line.Insert(15, ",");
line = line.Insert(37, ",");
- Is there any better way of doing that!!!?
Thanks in advance!
Adeel
--
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string comma = ",";
int[] insertIndexes[25] = {7,15,37,...};
for(int i =0;i < insertIndexes.Length;i++)
{
line = line.insert(insertIndexes[i],comma);
}
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 ! actually i was curious if there is any replacement for insert!!! !
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Each line = line.Insert(7, ","); will create a new string and copy all its characters.
If that results in several hundred chars being copied overall, I recommend you use
a StringBuilder, with sufficient initial capacity.
Then set up the logic to copy part of the input, add a comma, copy next part, etc
using nested for loops, and/or an array of constants.
finally transform StringBuilder object back to string with ToString().
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const int[] predefinedIndexes = new int[] {7, 15, 37};
const string notation = ",";
int lineLength = line.Length.
foreach(int index in predefinedIndexes)
{
// just for your safety 
if(index < 0 || index >= lineLength)
continue;
line.Insert(index, notation);
}
Hope this helps...
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You could try the following code:
private string insertChars(string str, char insertChar, int[] insertIndexes)
{
StringBuilder b = new StringBuilder(str.Length + insertIndexes.Length);
int count = 0;
for (int i = 0; i != str.Length;i++)
{
if (i == insertIndexes[count])
{
b.Append(insertChar);
if (++count==insertIndexes.Length)
{
b.Append(str.Substring(i,str.Length-i));
break;
}
}
b.Append(str[i]);
}
return b.ToString();
}
For it to work, your index array must be sorted.
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I am writing a program to simulate Go Back N method. I want to open two ports(ex 9999, 8888) on one IP address (ex 127.0.0.1). But when I open 2 port on local IP address and use 2 thread to handle, one for sending(port 9999), one for receiving response(port 8888), it allways show error message. Please help me to solve this. Thank alots.
ThanhND307
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Hello!
Hope you all are doing great! Need suggestion of how to reduce multiple characters to 1! Example is as follows:
We have a string
str = "this is an example ! "
we want to remove multiple space characters and want to have just single space instead! The number of spaces may be more than 200 in string! The result should be as follows:
str = "this is an example ! "
Any help/suggestion/guidence will certainly be appreciated! !
Regards!
Adeel
--
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This should work:
string oneSpace = " ";
string twoSpaces = " ";
string str = "You left out any multiple spaces in your example";
string newStr = str.Replace(twoSpaces,oneSpace);
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Hi,
since there may be more than 2 consecutive spaces, you need to iterate. This is how
I do this:
string s="whatever with many spaces";
do {
int len=s.Length;
s=s.Replace(twoSpaces, oneSpace);
} while (s.Length<len);
For very long strings with many sequences of multiple spaces, it may be more economic
to use a StringBuilder, and fill it in one pass using a bool that remembers whether last
char added was a space or not.
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! Thanks Luc, i guess i really have to learn to use stringbulder! ! Thanks both of you! !
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You are right, this would work better:
string test = "this string has multiple spaces .";
StringBuilder sb = new StringBuilder(test);
int l1 = sb.Length;
int l2 = l1 +1;
while (l1 != l2)
{
l1 = sb.Length;
sb.Replace(" ", " ");
l2 = sb.Length;
}
string result = sb.ToString();
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Sorry, but taking the trouble of using StringBuilder only makes sense if you succeed
in avoiding unnecessary copy operations, hence StringBuilder.Replace is not my choice at all.
Either you use String.Replace in a loop, or a one-pass populating StringBuilder.
BTW your initial values for i1 and i2 are not needed if you test after the loop (do-while).
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it is not working!!! ! extra spaces can be of any number!! and this will only replace 2 spaces with 1 what if we have 99 spaces? !
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Please don't end every sentence with an exclamation mark. Those are used for interjections and exclamations, not for ordinary sentences. An ordinary sentence is ended by a period.
You can replace multiple spaces using a regular expresson:
str = Regex.Replace(str, " {2,}", " ");
---
single minded; short sighted; long gone;
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actually they were used for exclamations and that is because working and learning new things of c# do make me happy.
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If you're happy and you know it keep it to your own darn self.
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I happen to have one here, one I wrote in C many years ago and then ported to C# a few years back, thanks for giving me a reason to revisit it. (Now I'll revisit my Split that honors quotes and escapes as well.)
Usage:
subject = the string to compress
trash = list of characters to compress (usually " \b" -- SPACE and TAB)
replacements = what to replace them with (usually " " -- SPACE)
quotes = if you don't want compress within quotes, specify "\"" or "'"
escapes = not often used, but if for instance trash contains "n" and subject contains "\n"
and you don't want it replaced, specify "\\" for escapes and the "\n" will be
preserved
(quotes and escapes may be empty or null)
advanced: two characters may be specified for replacements (and I've forgotten why I allow it)
given trash="z" and replacements="xy"
then subject="zzz" becomes "yyx" (rather than "x")
example:
if ( args.Length > 0 )
{
System.Console.Write
(
"<" +
PIEBALD.Lib.LibStr.Compress ( args [ 0 ] , " \b" , " " , "'" , "\\" )
+ ">"
) ;
}
public static string
Compress
(
string subject ,
string trash ,
string replacements ,
string quotes ,
string escapes
)
{
System.Text.StringBuilder result = new System.Text.StringBuilder ( subject.Length ) ;
char prevch = '\0' ;
int index = 0 ;
int quo = -1 ;
int quoon = -1 ;
int escon = -1 ;
if ( quotes == null )
{
quotes = "" ;
}
if ( escapes == null )
{
escapes = "" ;
}
while ( index < subject.Length )
{
if ( ( escon = escapes.IndexOf ( prevch ) ) != -1 )
{
quoon = -1 ;
}
else
{
quoon = quotes.IndexOf ( subject [ index ] ) ;
}
if ( quoon != -1 )
{
if ( quo == -1 )
{
quo = quoon ;
}
else
{
if ( quo == quoon )
{
quo = -1 ;
}
}
}
prevch = subject [ index ] ;
if ( ( quo == -1 ) && ( trash.IndexOf ( subject [ index ] ) != -1 ) )
{
if ( ( index == subject.Length-1 ) || ( trash.IndexOf ( subject [ index+1 ] ) == -1 ) )
{
result.Append ( replacements [ 0 ] ) ;
}
else
{
if ( replacements.Length > 1 )
{
result.Append ( replacements [ 1 ] ) ;
}
}
index++ ;
}
else
{
result.Append ( subject [ index++ ] ) ;
}
}
return ( result.ToString() ) ;
}
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! that is some re-usability! ! the suggestion/guidence by Luc is proving to be great and actually bit simpler tooo Thanks PIEBALDconsult
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I don't like to write single-use library functions, the more flexibility the better in my opinion, but the RegularExpression solution may be our best bet.
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str = str.Replace(" ", " ");
the first argument in str.Replace is a 2 white space characters ( press spacebar twice )
the second argument in str is a 1 white space character ( press spacebar once )
Sorry, but I had to explain these arguments ion details, they are not correctly shown after the message is posted.
Hope this helps...
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Dear all,
I have a treeview which I populate from a postgres database. This all works fine, and I'm using the following code :
DataRow newRow = dt.NewRow();<br />
dt.Columns.Add("Resources", typeof(System.String));<br />
<br />
if (dt.Rows.Count > 0)<br />
{<br />
treeView1.BeginUpdate();<br />
foreach (DataRow r in dt.Rows)<br />
{<br />
treeView1.Nodes.Add(new TreeNode(r["res_lastname"].ToString()));<br />
}<br />
treeView1.EndUpdate();<br />
}
Well, I'm not grabbing the data from the database directly but rather through a dataset.
I can add as many rows as I like, just by putting an extra line in , like this :
treeView1.Nodes.Add(new TreeNode(r["res_lastname"].ToString()));<br />
treeView1.Nodes.Add(new TreeNode(r["res_firstname"].ToString()));
Lastname and Firstname show up in the treeview below eachother :
-- Lastname
-- Firstname
Is there a way to show them right next to eachother , like this :
-- Lastname, Firstname
kind regards,
Rick
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Rick van Woudenberg wrote: treeView1.Nodes.Add(new TreeNode(r["res_lastname"].ToString()));
treeView1.Nodes.Add(new TreeNode(r["res_firstname"].ToString()));
Have you tried this?
treeView1.Nodes.Add(new TreeNode(r["res_lastname"].ToString() + "," + r["res_firstname"].ToString()));
Regards,
Arun Kumar.A
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I just did and it works perfect. I need a vacation, how could I miss that ? :-S
Thank you so much for your help and quick input.
Cheers !
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No, you should query the fullname like
res_fullname=res_lastname+' '+res_firstname
and then use
treeView1.Nodes.Add(new TreeNode(r["res_fullname"].ToString()
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