We Keep Coding

C# WPF Separate characters from a string (starting from the back)

I have such a comic string.
www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx
I would like to get only the test.xlsx out.
So I wanted to say that I wanted to separate the string from behind.
That he he once the first = sign found me the string supplies the from the end to the = sign goes.
Whats the best way to do this?
Unfortunately, I would not know how I should do with SubString, since the length can always be different. But I know that in the end is what I need and the unnecessary with the first = Begin from behind

Yes, Substring will do, and there's no need to know the length:
string source = "www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx";
// starting from the last '=' up to the end of the string
string result = source.SubString(source.LastIndexOf("=") + 1);

Another option:
string source = "www.asdsad.de/dsfdsf/sdfdsf=dsfdsfs?dsfsndfsajdn=sfdjasdhads=test.xlsx";
Stack<char> sb = new Stack<char>();
for (var i = source.Length - 1; i > 0; i--)
{
if (source[i] == '=')
{
break;
}
sb.Push(source[i]);
}
var result = string.Concat(sb.ToArray());

How to contact whole text from file into the string avoiding empty lines beetwen strings

How to get whole text from document contacted into the string. I'm trying to split text by dot: string[] words = s.Split('.'); I want take this text from text document. But if my text document contains empty lines between strings, for example:
pat said, “i’ll keep this ring.”
she displayed the silver and jade wedding ring which, in another time track,
she and joe had picked out; this
much of the alternate world she had elected to retain. he wondered what - if any - legal basis she had kept in addition. none, he hoped; wisely, however, he said nothing. better not even to ask.
result looks like this:
1. pat said ill keep this ring
2. she displayed the silver and jade wedding ring which in another time track
3. she and joe had picked out this
4. much of the alternate world she had elected to retain
5. he wondered what if any legal basis she had kept in addition
6. none he hoped wisely however he said nothing
7. better not even to ask
but desired correct output should be like this:
1. pat said ill keep this ring
2. she displayed the silver and jade wedding ring which in another time track she and joe had picked out this much of the alternate world she had elected to retain
3. he wondered what if any legal basis she had kept in addition
4. none he hoped wisely however he said nothing
5. better not even to ask
So to do this first I need to process text file content to get whole text as single string, like this:
pat said, “i’ll keep this ring.” she displayed the silver and jade wedding ring which, in another time track, she and joe had picked out; this much of the alternate world she had elected to retain. he wondered what - if any - legal basis she had kept in addition. none, he hoped; wisely, however, he said nothing. better not even to ask.
I can't to do this same way as it would be with list content for example: string concat = String.Join(" ", text.ToArray());,
I'm not sure how to contact text into string from text document

I think this is what you want:
var fileLocation = #"c:\\myfile.txt";
var stringFromFile = File.ReadAllText(fileLocation);
//replace Environment.NewLine with any new line character your file uses
var withoutNewLines = stringFromFile.Replace(Environment.NewLine, "");
//modify to remove any unwanted character
var withoutUglyCharacters = Regex.Replace(withoutNewLines, "[“’”,;-]", "");
var withoutTwoSpaces = withoutUglyCharacters.Replace(" ", " ");
var result = withoutTwoSpaces.Split('.').Where(i => i != "").Select(i => i.TrimStart()).ToList();
So first you read all text from your file, then you remove all unwanted characters and then split by . and return non empty items

Have you tried replacing double new-lines before splitting using a period?
static string[] GetSentences(string filePath) {
if (!File.Exists(filePath))
throw new FileNotFoundException($"Could not find file { filePath }!");
var lines = string.Join("", File.ReadLines(filePath).Where(line => !string.IsNullOrEmpty(line) && !string.IsNullOrWhiteSpace(line)));
var sentences = Regex.Split(lines, #"\.[\s]{1,}?");
return sentences;
}
I haven't tested this, but it should work.
Explanation:
if (!File.Exists(filePath))
throw new FileNotFoundException($"Could not find file { filePath }!");
Throws an exception if the file could not be found. It is advisory you surround the method call with a try/catch.
var lines = string.Join("", File.ReadLines(filePath).Where(line => !string.IsNullOrEmpty(line) && !string.IsNullOrWhiteSpace(line)));
Creates a string, and ignores any lines which are purely whitespace or empty.
var sentences = Regex.Split(lines, #".[\s]{1,}?");
Creates a string array, where the string is split at every period and whitespace following the period.
E.g:
The string "I came. I saw. I conquered" would become
I came
I saw
I conquered
Update:
Here's the method as a one-liner, if that's your style?
static string[] SplitSentences(string filePath) => File.Exists(filePath) ? Regex.Split(string.Join("", File.ReadLines(filePath).Where(line => !string.IsNullOrEmpty(line) && !string.IsNullOrWhiteSpace(line))), #"") : null;

I would suggest you to iterate through all characters and just check if they are in range of 'a' >= char <= 'z' or if char == ' '. If it matches the condition then add it to the newly created string else check if it is '.' character and if it is then end your line and add another one :
List<string> lines = new List<string>();
string line = string.Empty;
foreach(char c in str)
{
if((char.ToLower(c) >= 'a' && char.ToLower(c) <= 'z') || c == 0x20)
line += c;
else if(c == '.')
{
lines.Add(line.Trim());
line = string.Empty;
}
}
Working online example
Or if you prefer "one-liner"s :
IEnumerable<string> lines = new string(str.Select(c => (char)(((char.ToLower(c) >= 'a' && char.ToLower(c) <= 'z') || c == 0x20) ? c : c == '.' ? '\n' : '\0')).ToArray()).Split('\n').Select(s => s.Trim());

I may be wrong about this. I would think that you may not want to alter the string if you are splitting it. Example, there are double/single quote(s) (“) in part of the string. Removing them may not be desired which brings up the possibly of a question, reading a text file that contains single/double quotes (as your example data text shows) like below:
var stringFromFile = File.ReadAllText(fileLocation);
will not display those characters properly in a text box or the console because the default encoding using the ReadAllText method is UTF8. Example the single/double quotes will display (replacement characters) as diamonds in a text box on a form and will be displayed as a question mark (?) when displayed to the console. To keep the single/double quotes and have them display properly you can get the encoding for the OS’s current ANSI encoding by adding a parameter to the ReadAllText method like below:
string stringFromFile = File.ReadAllText(fileLocation, ASCIIEncoding.Default);
Below is code using a simple split method to .split the string on periods (.) Hope this helps.
private void button1_Click(object sender, EventArgs e) {
string fileLocation = #"C:\YourPath\YourFile.txt";
string stringFromFile = File.ReadAllText(fileLocation, ASCIIEncoding.Default);
string bigString = stringFromFile.Replace(Environment.NewLine, "");
string[] result = bigString.Split('.');
int count = 1;
foreach (string s in result) {
if (s != "") {
textBox1.Text += count + ". " + s.Trim() + Environment.NewLine;
Console.WriteLine(count + ". " + s.Trim());
count++;
}
else {
// period at the end of the string
}
}
}

remove first line from string builder / string c#

Okay so I'm trying to make a 'console' like text box within a form, however once you reach the bottom, instaid of being able to scroll up, it will just delete the top line, Im having some difficulties.
So far, when it gets to bottom it deletes the top line, however only once, it just carries on as normal. Here is my function:
StringBuilder sr = new StringBuilder();
public void writeLine(string input)
{
string firstline = "";
int numLines = Convert.ToString(sr).Split('\n').Length;
if (numLines > 15) //Max Lines
{
sr.Remove(0, Convert.ToString(sr).Split('\n').FirstOrDefault().Length);
}
sr.Append(input + "\r\n");
consoleTxtBox.Text = Convert.ToString(sr) + numLines;
}
Would be great if someone could fix this, thanks
Lucas

First, what's wrong with your solution: the reason it does not work is that it removes the content of the line, but it ignores the \n at the end. Adding 1 should fix that:
sr.Remove(0, Convert.ToString(sr).Split('\n').FirstOrDefault().Length+1);
// ^
// |
// This will take care of the trailing '\n' after the first line ---+
Now to doing it a simpler way: all you need to do is finding the first \n, and taking substring after it, like this:
string RemoveFirstLine(string s) {
return s.Substring(s.IndexOf(Environment.NewLine)+1);
}
Note that this code does not crash even when there are no newline characters in the string, i.e. when IndexOf returns -1 (in which case nothing is removed).

You can use the Lines property from the TextBox. This will get all the lines in the TextBox, as an array, then create a new array that doesn't include the first element (Skip(1)). It assigns this new array back to the textbox.
string[] lines = textBox.Lines;
textBox.Lines = lines.Skip(1).ToArray();

A simple alternative: you could split the string by Environment.NewLine and return all but the first:
public static string RemoveFirstLine(string input)
{
var lines = input.Split(new[] { Environment.NewLine }, StringSplitOptions.None);
return string.Join(Environment.NewLine, lines.Skip(1));
}
Demo

you can remove this line
var lines = lines.Remove(0, lines.ToString().IndexOf(Environment.NewLine));

Most solutions does not seem to take into account the fact that Enviroment.NewLine can consist of multiple characters (len > 1).
public void RemoveFirstStringFromStringBuilder()
{
var lines = new StringBuilder();
lines.AppendLine("abc");
var firstLine = lines.ToString().IndexOf(Environment.NewLine, StringComparison.Ordinal);
if (firstLine >= 0)
lines.Remove(0, firstLine + Environment.NewLine.Length);
Console.WriteLine(lines.Length);
Console.WriteLine(lines.ToString());
}
Prints out: 0 and ""

What worked for me is:
var strBuilder = new StringBuilder();
strBuilder.AppendLine("ABC");
strBuilder.AppendLine("54");
strBuilder.AppendLine("04");
strBuilder.Remove(0, strBuilder.ToString().IndexOf(Environment.NewLine) + 2);
Console.WriteLine(strBuilder);
Solution with +1 didn't work for me, probably because of EOF in this context being interpreted as 2 chars (\r\n)

Parse Text File Into Dictionary

I have a text file that has several hundred configuration values. The general format of the configuration data is "Label:Value". Using C# .net, I would like to read these configurations, and use the Values in other portions of the code. My first thought is that I would use a string search to look for the Labels then parse out the values following the labels and add them to a dictionary, but this seems rather tedious considering the number of labels/values that I would have to search for. I am interested to hear some thoughts on a possible architecture to perform this task. I have included a small section of a sample text file that contains some of the labels and values (below). A couple of notes: The Values are not always numeric (as seen in the AUX Serial Number); For whatever reason, the text files were formatted using spaces (\s) rather than tabs (\t). Thanks in advance for any time you spend thinking about this.
Sample Text:
AUX Serial Number: 445P000023 AUX Hardware Rev: 1
Barometric Pressure Slope: -1.452153E-02
Barometric Pressure Intercept: 9.524336E+02

This is a nice little brain tickler. I think this code might be able to point you in the right direction. Keep in mind, this fills a Dictionary<string, string>, so there are no conversions of values into ints or the like. Also, please excuse the mess (and the poor naming conventions). It was a quick write-up based on my train of thought.
Dictionary<string, string> allTheThings = new Dictionary<string, string>();
public void ReadIt()
{
// Open the file into a streamreader
using (System.IO.StreamReader sr = new System.IO.StreamReader("text_path_here.txt"))
{
while (!sr.EndOfStream) // Keep reading until we get to the end
{
string splitMe = sr.ReadLine();
string[] bananaSplits = splitMe.Split(new char[] { ':' }); //Split at the colons
if (bananaSplits.Length < 2) // If we get less than 2 results, discard them
continue;
else if (bananaSplits.Length == 2) // Easy part. If there are 2 results, add them to the dictionary
allTheThings.Add(bananaSplits[0].Trim(), bananaSplits[1].Trim());
else if (bananaSplits.Length > 2)
SplitItGood(splitMe, allTheThings); // Hard part. If there are more than 2 results, use the method below.
}
}
}
public void SplitItGood(string stringInput, Dictionary<string, string> dictInput)
{
StringBuilder sb = new StringBuilder();
List<string> fish = new List<string>(); // This list will hold the keys and values as we find them
bool hasFirstValue = false;
foreach (char c in stringInput) // Iterate through each character in the input
{
if (c != ':') // Keep building the string until we reach a colon
sb.Append(c);
else if (c == ':' && !hasFirstValue)
{
fish.Add(sb.ToString().Trim());
sb.Clear();
hasFirstValue = true;
}
else if (c == ':' && hasFirstValue)
{
// Below, the StringBuilder currently has something like this:
// " 235235 Some Text Here"
// We trim the leading whitespace, then split at the first sign of a double space
string[] bananaSplit = sb.ToString()
.Trim()
.Split(new string[] { " " },
StringSplitOptions.RemoveEmptyEntries);
// Add both results to the list
fish.Add(bananaSplit[0].Trim());
fish.Add(bananaSplit[1].Trim());
sb.Clear();
}
}
fish.Add(sb.ToString().Trim()); // Add the last result to the list
for (int i = 0; i < fish.Count; i += 2)
{
// This for loop assumes that the amount of keys and values added together
// is an even number. If it comes out odd, then one of the lines on the input
// text file wasn't parsed correctly or wasn't generated correctly.
dictInput.Add(fish[i], fish[i + 1]);
}
}

So the only general approach that I can think of, given the format that you're limited to, is to first find the first colon on the line and take everything before it as the label. Skip all whilespace characters until you get to the first non-whitespace character. Take all non-whitespace characters as the value of the label. If there is a colon after the end of that value take everything after the end of the previous value to the colon as the next value and repeat. You'll also probably need to trim whitespace around the labels.
You might be able to capture that meaning with a regex, but it wouldn't likely be a pretty one if you could; I'd avoid it for something this complex unless you're entire development team is very proficient with them.

I would try something like this:
While string contains triple space, replace it with double space.
Replace all ": " and ": " (: with double space) with ":".
Replace all " " (double space) with '\n' (new line).
If line don't contain ':' than skip the line. Else, use string.Split(':'). This way you receive arrays of 2 strings (key and value). Some of them may contain empty characters at the beginning or at the end.
Use string.Trim() to get rid of those empty characters.
Add received key and value to Dictionary.
I am not sure if it solves all your cases but it's a general clue how I would try to do it.
If it works you could think about performance (use StringBuilder instead of string wherever it is possible etc.).

This is probably the dirtiest function I´ve ever written, but it works.
StreamReader reader = new StreamReader("c:/yourFile.txt");
Dictionary<string, string> yourDic = new Dictionary<string, string>();
StreamReader reader = new StreamReader("c:/yourFile.txt");
Dictionary<string, string> yourDic = new Dictionary<string, string>();
while (reader.Peek() >= 0)
{
string line = reader.ReadLine();
string[] data = line.Split(':');
if (line != String.Empty)
{
for (int i = 0; i < data.Length - 1; i++)
{
if (i != 0)
{
bool isPair;
if (i % 2 == 0)
{
isPair = true;
}
else
{
isPair = false;
}
if (isPair)
{
string keyOdd = data[i].Trim();
try { keyOdd = keyOdd.Substring(keyOdd.IndexOf(' ')).TrimStart(); }
catch { }
string valueOdd = data[i + 1].TrimStart();
try { valueOdd = valueOdd.Remove(valueOdd.IndexOf(' ')); } catch{}
yourDic.Add(keyOdd, valueOdd);
}
else
{
string keyPair = data[i].TrimStart();
keyPair = keyPair.Substring(keyPair.IndexOf(' ')).Trim();
string valuePair = data[i + 1].TrimStart();
try { valuePair = valuePair.Remove(valuePair.IndexOf(' ')); } catch { }
yourDic.Add(keyPair, valuePair);
}
}
else
{
string key = data[i].Trim();
string value = data[i + 1].TrimStart();
try { value = value.Remove(value.IndexOf(' ')); } catch{}
yourDic.Add(key, value);
}
}
}
}
How does it works?, well splitting the line you can know what you can get in every position of the array, so I just play with the even and odd values.
You will understand me when you debug this function :D. It fills the Dictionary that you need.

I have another idea. Does values contain spaces? If not you could do like this:
Ignore white spaces until you read some other char (first char of key).
Read string until ':' occures.
Trim key that you get.
Ignore white spaces until you read some other char (first char of value).
Read until you get empty char.
Trim value that you get.
If it is the end than stop. Else, go back to step 1.
Good luck.

Maybe something like this would work, be careful with the ':' character
StreamReader reader = new StreamReader("c:/yourFile.txt");
Dictionary<string, string> yourDic = new Dictionary<string, string>();
while (reader.Peek() >= 0)
{
string line = reader.ReadLine();
yourDic.Add(line.Split(':')[0], line.Split(':')[1]);
}
Anyway, I recommend to organize that file in some way that you´ll always know in what format it comes.

How to remove a duplicate set of characters in a string

For example a string contains the following (the string is variable):
http://www.google.comhttp://www.google.com
What would be the most efficient way of removing the duplicate url here - e.g. output would be:
http://www.google.com

I assume that input contains only urls.
string input = "http://www.google.comhttp://www.google.com";
// this will get you distinct URLs but without "http://" at the beginning
IEnumerable<string> distinctAddresses = input
.Split(new[] {"http://"}, StringSplitOptions.RemoveEmptyEntries)
.Distinct();
StringBuilder output = new StringBuilder();
foreach (string distinctAddress in distinctAddresses)
{
// when building the output, insert "http://" before each address so
// that it resembles the original
output.Append("http://");
output.Append(distinctAddress);
}
Console.WriteLine(output);

Efficiency has various definitions: code size, total execution time, CPU usage, space usage, time to write the code, etc. If you want to be "efficient", you should know which one of these you're trying for.
I'd do something like this:
string url = "http://www.google.comhttp://www.google.com";
if (url.Length % 2 == 0)
{
string secondHalf = url.Substring(url.Length / 2);
if (url.StartsWith(secondHalf))
{
url = secondHalf;
}
}
Depending on the kinds of duplicates you need to remove, this may or may not work for you.

collect strings into list and use distinct, if your string has http address you can apply regex http:.+?(?=((http:)|($)) with RegexOptions.SingleLine
var distinctList = list.Distinct(StringComparer.CurrentCultureIgnoreCase).ToList();

Given you don't know the length of the string, you don't know if something is double and you don't know what is double:
string yourprimarystring = "http://www.google.comhttp://www.google.com";
int firstCharacter;
string temp;
for(int i = 0; i <= yourprimarystring.length; i++)
{
for(int j = 0; j <= yourprimarystring.length; j++)
{
string search = yourprimarystring.substring(i,j);
firstCharacter = yourprimaryString.IndexOf(search);
if(firstCharacter != -1)
{
temp = yourprimarystring.substring(0,firstCharacter) + yourprimarystring.substring(firstCharacter + j - i,yourprimarystring.length)
yourprimarystring = temp;
}
}
This itterates through all your elements, takes all out from first to last letter and searches for them like this:
ABCDA - searches for A finds A exludes A, thats the problem, you need to specify how long the duplication needs to be if you want to make it variable, but maybe my code helps you.