Develop Reference

SSIS C# Script Task: How to match/replace pattern with increment on a large XML file

There are other similar questions that have been asked and answered, but none of those answers work in what I'm trying to do, or there isn't enough information for me to know how to implement it in my own code. I've been at it for two days and now must ask for help.
I have a script task in an SSIS package where I need to do a match and replace on a large XML file that contains thousands of Record Identifier tags. Each one contains a number. I need those numbers to be consecutive and increment by one. For example, within the xml file, I am able to find tags that appear like this:
<ns1:recordIdentifier>1</ns1:recordIdentifier>
<ns1:recordIdentifier>6</ns1:recordIdentifier>
<ns1:recordIdentifier>223</ns1:recordIdentifier>
<ns1:recordIdentifier>4102</ns1:recordIdentifier>
I need to find and replace those tags with consecutive increments like so:
<ns1:recordIdentifier>1</ns1:recordIdentifier>
<ns1:recordIdentifier>2</ns1:recordIdentifier>
<ns1:recordIdentifier>3</ns1:recordIdentifier>
<ns1:recordIdentifier>4</ns1:recordIdentifier>
The code I have so far is causing all the numbers to be "1" with no incrementation.
I've tried dozens of different methods, but nothing has worked yet.
Any ideas as to how I can modify the below code to increment as desired?
public void Main()
{
string varStart = "<ns1:recordIdentifier>";
string varEnd = "</ns1:recordIdentifier>";
int i = 1;
string path = Dts.Variables["User::xmlFilename"].Value.ToString();
string outPath = Dts.Variables["User::xmlOutputFile"].Value.ToString();
string ptrn = #"<ns1:recordIdentifier>\d{1,4}<\/ns1:recordIdentifier>";
string replace = varStart + i + varEnd;
using (StreamReader sr = File.OpenText(path))
{
string s = "";
while ((s = sr.ReadLine()) != null && i>0)
{
File.WriteAllText(outPath, Regex.Replace(File.ReadAllText(path),
ptrn, replace));
i++;
}
}
}

You were on the right path with the Replace method, but will need to use the MatchEvaluater parameter when you increment.
string inputFile = Dts.Variables["User::xmlFilename"].Value.ToString();
string outPutfile = Dts.Variables["User::xmlOutputFile"].Value.ToString();
string fileText = File.ReadAllText(inputFile);
//get any number between elements
Regex reg = new Regex("<ns1:recordIdentifier>[0-9]</ns1:recordIdentifier>");
string xmlStartTag = "<ns1:recordIdentifier>";
string xmlEndTag = "</ns1:recordIdentifier>";
//assuming this starts at 1
int incrementInt = 1;
fileText = reg.Replace(fileText, tag =>
{ return xmlStartTag + incrementInt++.ToString() + xmlEndTag; });
File.WriteAllText(outPutfile, fileText);

Finding text between lines in text file

I have the following code in a text file:
static const char* g_FffectNames[EFFECT_COUNT] = {
"Fade In and Fade Out",
"Halloween Eyes",
"Rainbow Cycles"
};
I can use g_FffectNames[EFFECT_COUNT] as a starting point to search in this big text file. But I need to get the things within quotes (e.g Halloween Eyes or Rainbow Cycles).
What is the best way to get those text in C#? I would also have to assume that there are more code on top of this file (before the static const) and also toward the bottom (after the }; ) and that spacing between characters such as = { or }; is optional to the user.
Should I compress all of these lines into one string and start the search or should I use some sort of regex matching to make this easier?

You can use a regular expressions to parse input file:
var input = /* file content */;
var regex = new Regex("^\\s*\"(?<row>[^\"]+)\\s*\"", RegexOptions.Multiline);
var values = regex.Matches(input)
.Cast<Match>()
.Select(m => m.Groups["row"]).ToArray();

I got it working based on this post:
c# search string in txt file
public string readText()
{
string test = string.Empty;
var mytext = File.ReadLines("C:\\temp\\test_search.txt")
.SkipWhile(line => !line.Contains("g_FffectNames[EFFECT_COUNT]"))
.Skip(1)
.TakeWhile(line => !line.Contains("};"));
foreach (var line in mytext)
{
test += line;
}
return test;
}

String function for arranging a string in a paritular width in .net

i want to arrange a string in a text file in a fixed length.
Eg:
dbrow("ITC_DESC").ToString().Trim().PadRight(20)
but the problem is that when a string with more than 20 length it will be widened.
I want to make it fixed.It will need to display only 20 characters.

Please try with the below code snippet. By using below code if the string length is more then 20 than it remove the extra characters from the string.
string str = Convert.ToString(dbrow("ITC_DESC")).Trim();
if (str.Length > 20)
{
str = str.Substring(0,20);
}
else
{
str = str.PadRight(20);
}
Let me know if any concern.

Replacing characters in a string with another string

So what I am trying to do is as follows :
example of a string is A4PC
I am trying to replace for example any occurance of "A" with "[A4]" so I would get and similar any occurance of "4" with "[A4]"
"[A4][A4]PC"
I tried doing a normal Replace on the string but found out I got
"[A[A4]]PC"
string badWordAllVariants =
restriction.Value.Replace("A", "[A4]").Replace("4", "[A4]")
since I have two A's in a row causing an issue.
So I was thinking it would be better rather than the replace on the string I need to do it on a character per character basis and then build up a string again.
Is there anyway in Linq or so to do something like this ?

You don't need any LINQ here - String.Replace works just fine:
string input = "AAPC";
string result = input.Replace("A", "[A4]"); // "[A4][A4]PC"
UPDATE: For your updated requirements I suggest to use regular expression replace
string input = "A4PC";
var result = Regex.Replace(input, "A|4", "[A4]"); // "[A4][A4]PC"

This works well for me:
string x = "AAPC";
string replace = x.Replace("A", "[A4]");
EDIT:
Based on the updated question, the issue is the second replacement. In order to replace multiple strings you will want to do this sequentially:
var original = "AAPC";
// add arbitrary room to allow for more new characters
StringBuilder resultString = new StringBuilder(original.Length + 10);
foreach (char currentChar in original.ToCharArray())
{
if (currentChar == 'A') resultString.Append("[A4]");
else if (currentChar == '4') resultString.Append("[A4]");
else resultString.Append(currentChar);
}
string result = resultString.ToString();
You can run this routine with any replacements you want to make (in this case the letters 'A' and '4' and it should work. If you would want to replace strings the code would be similar in structure but you would need to "look ahead" and probably use a for loop. Hopefully this helps!
By the way - you want to use a string builder here and not strings because strings are static which means space gets allocated every time you loop. (Not good!)

I think this should do the trick
string str = "AA4PC";
string result = Regex.Replace(str, #"(?<Before>[^A4]?)(?<Value>A|4)(?<After>[^A4]?)", (m) =>
{
string before = m.Groups["Before"].Value;
string after = m.Groups["After"].Value;
string value = m.Groups["Value"].Value;
if (before != "[" || after != "]")
{
return "[A4]";
}
return m.ToString();
});
It is going to replace A and 4 that hasn't been replaced yet for [A4].

Read a file and replace test after a certain word

I have a few files, for example:
FileBegin Finance Open 87547.25 Close 548484.54 EndDay 4 End
Another file example:
FileBegin Finance Open 344.34 Close -3434.34 EndDay 5 End
I need to read the text in the file and replace only the numeric value after the word Open leaving the rest of the text before and after the word Open intact. I have been using this code:
string fileToRead = "c:\\file.txt";
public void EditValue(string oldValue, string newValue, Control Item)
{
if (Item is TextBox)
{
string text = File.ReadAllText(fileToRead);
text = text.Replace(oldValue, newValue);
File.WriteAllText(activeSaveFile, text);
}
}
What would be the best way of going about replacing just the numeric value after the word open?

Using Regular Expressions:
Regex rgx = new Regex(#"Open [^\s]+");
string result = rgx.Replace(text, newValue);
File.WriteAllText(activeSaveFile, result );
Using this approach, you can store the regex object outside the method so you avoid recompiling it each time. I'm guessing it won't have a significant performance impact compared to the file I/O in your case, but it is a good practice in other situations.

Split the row by the empty spaces like string.split(new char[] { ' ' }, StringSplitOptions.Empty) and then get the _splittedRow[3] and replace and merge the new row together.

If I understand you, the line:
FileBegin Finance Open 344.34 Close -3434.34 EndDay 5 End
is the entire file? And you have been typing in "344.34" for the old value and "something" for the new value? And you'd like to just type the new value only?
You could say:
string fileToRead = "c:\\file.txt";
public void EditValue(string oldValue, string newValue, Control Item)
{
if (Item is TextBox)
{
string text = File.ReadAllText(fileToRead);
string[] words = text.Split(new char[] {' '}); // assuming space-delimited
words[3] = "new value"; // replace the target value
text = "";
foreach (string w in words)
{
text += w + " "; // build our new string
}
File.WriteAllText(activeSaveFile, text.Trim()); // and write it back out
}
}
That's a lot of ifs, but I think this is what you mean. Also there are a lot of different ways to replace that one part of the string, I just thought this would give you the flexibility to do other things with a convenient array of words.