Develop Reference

C# can't split a string into an array by newline (from StreamReader)

StreamReader login = new StreamReader("C:/Users/Me/Documents/logins.txt");
string ar = login.ReadToEnd();
string[] names = ar.Split("\r\n");
login.Close();
I'm reading from a file a set of logins, exampled as "username,password" then a newline as "usr,pwd" or something else. I want to split the txt file into a set of arrays by splitting at the start of a new line, but "\r\n" doesn't seem to be working, coming up with the error "cannot convert from string to char". I have tried Environment.Newline, but that is not working either, coming with the same error message.

Instead of dealing with a stream just use File.ReadAllLines
string[] names = File.ReadAllLines("C:/Users/Me/Documents/logins.txt");

String.Split needs an array or eiter char or string values to split on. You need to change your code to:
string[] names = ar.Split(new string[]{"\r\n"}, StringSplitOptions.None);

You can read each line individually like so:
using (StreamReader reader = new StreamReader(pathToFile)) {
string line = reader.ReadLine();
}
This may be preferable as you don't have to rely on the line return type to be correct using a char

Getting numerical amounts from csv files

Hi my application basically reads a CSV file which will always have the same format and I need the application to create a CSV file with different formatting. Reading and writing CSV file is not the issue, however the problem I am having is getting the amounts value as these are formatted with a , in the csv file (ex: 4, 500). Having said that these are being split when writing to csv file.
Ex: From the below, how can I get the full numbers .i.e. 2241.84 & 1072809.33
line = "\"02 MAY 18\",\"TTEWTWTE\",\"GRHGWHWH\",\"02 MAY 18\",\"2,241.84\",\"\",\"1,072,809.33\""
This is how I am reading from CSV file.
openFileDialog1.ShowDialog();
var reader = new StreamReader(File.OpenRead(openFileDialog1.FileName));
List<string> searchList = new List<string>();
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
searchList.Add(line);
}
So far I have tried to use the below which gets you \"2,241.84\" which is correct but when writing to csv file I am only getting 2
searchList[2].Split(',')[1].Replace("\"", "")

Let me visualize contents in another way:
"
\"02 MAY 18\",
\"TTEWTWTE\",
\"GRHGWHWH\",
\"02 MAY 18\",
\"2,241.84\",
\"\",
\"1,072,809.33\"
"
It seems that your separator is \", rather than ,. Change searchList[2].Split(',')[1].Replace("\"", "") to searchList[1].Split(new string[] { "\",\"" }, StringSplitOptions.None).

In your case you can use this:
var result = searchList[2].Split(new string[] { "\",\"" }, StringSplitOptions.None)[4].Replace("\"", "");
Split your string with "," separator, instead of ,.
I don't know why you are using static numbers for indexes, but I will assume it's for test purposes.

Reading CSV file having Field name in each line?

I am working in an ERP integration software. I need to parse CSV file from HRM application to make an entry.
I am getting the input CSV file like this:
$Emp.No$=123456,$CardNo$=254658,$InTime$="12/11/2013 09:03:05",$OutTime$="12/11/2013 17:25:20"
$Emp.No$=565556,$CardNo$=254689,$InTime$="12/11/2013 09:03:50",$OutTime$="12/11/2013 18:01:11"
The CSV file doesn't have a column name header, instead each field has a field name associated with it inside $FieldName$.
I tried to parse it with CSVHelper. It just works fine, when using ReadFieldsByIndex() method.
Problem:
Some of the columns do not have $InTime$ or $OutTime$. So, reading by index fails. How can I read only available data and how to map according to the field name available in each line.

You haven't got a CSV file there. You have a data file, each line of which contains one or more key/value pairs, separated by commas. The key and value are separated by an = and the key is enclosed by $'s.
Having expressed what you have, that should help you identify a solution:
Don't use a CSV framework.
Read each line at a time from the file.
Split the line on , to give you the key value pairs.
Split the key value pairs on = to give the two parts.
(Optionally) remove the $ from the key name.
You then should have a suitable level of data to transfer these values into whatever destination objects you have.

This will write to the separate file with headers and followed by values.
string file =#"D:\STACKOVERFLOW\csvproblem.txt";
string newfile =#"D:\STACKOVERFLOW\output.txt";
StreamReader sr = new StreamReader(file);
StreamWriter sw = new StreamWriter(newfile);
try{
string header = "";
StringBuilder sb = new StringBuilder();
StringBuilder sb_header = new StringBuilder();
bool recordHeader = true;
while(sr.EndOfStream==false){
string readLine = sr.ReadLine();
string[] split = readLine.Split(',');
sb = new StringBuilder();
foreach (string str in split)
{
if (recordHeader)
{
if (str.IndexOf('$') < str.LastIndexOf('$'))
{
sb_header.AppendFormat("{0},",
str.Substring(str.IndexOf('$'),str.IndexOf('$')+str.LastIndexOf('$')+1));
}
}
sb.AppendFormat("{0},", str.Substring(str.IndexOf('=')+1));
}
if (recordHeader)
{
sw.WriteLine(sb_header.ToString().Trim(','));
}
sw.WriteLine(sb.ToString().Trim(','));
recordHeader = false;
}
}
finally{
sr.Close();
sw.Close();
}

C# read txt file and store the data in formatted array

I have a text file which contains following
Name address phone salary
Jack Boston 923-433-666 10000
all the fields are delimited by the spaces.
I am trying to write a C# program, this program should read a this text file and then store it in the formatted array.
My Array is as follows:
address
salary
When ever I am trying to look in google I get is how to read and write a text file in C#.
Thank you very much for your time.

You can use File.ReadAllLines method to load the file into an array. You can then use a for loop to loop through the lines, and the string type's Split method to separate each line into another array, and store the values in your formatted array.
Something like:
static void Main(string[] args)
{
var lines = File.ReadAllLines("filename.txt");
for (int i = 0; i < lines.Length; i++)
{
var fields = lines[i].Split(' ');
}
}

Do not reinvent the wheel. Can use for example fast csv reader where you can specify a delimeter you need.
There are plenty others on internet like that, just search and pick that one which fits your needs.

This answer assumes you don't know how much whitespace is between each string in a given line.
// Method to split a line into a string array separated by whitespace
private string[] Splitter(string input)
{
return Regex.Split(intput, #"\W+");
}
// Another code snippet to read the file and break the lines into arrays
// of strings and store the arrays in a list.
List<String[]> arrayList = new List<String[]>();
using (FileStream fStream = File.OpenRead(#"C:\SomeDirectory\SomeFile.txt"))
{
using(TextReader reader = new StreamReader(fStream))
{
string line = "";
while(!String.IsNullOrEmpty(line = reader.ReadLine()))
{
arrayList.Add(Splitter(line));
}
}
}

Searching strings in txt file

I have a .txt file with a list of 174 different strings. Each string has an unique identifier.
For example:
123|this data is variable|
456|this data is variable|
789|so is this|
etc..
I wish to write a programe in C# that will read the .txt file and display only one of the 174 strings if I specify the ID of the string I want. This is because in the file I have all the data is variable so only the ID can be used to pull the string. So instead of ending up with the example about I get just one line.
eg just
123|this data is variable|
I seem to be able to write a programe that will pull just the ID from the .txt file and not the entire string or a program that mearly reads the whole file and displays it. But am yet to wirte on that does exactly what I need. HELP!
Well the actual string i get out from the txt file has no '|' they were just in the example. An example of the real string would be: 0111111(0010101) where the data in the brackets is variable. The brackets dont exsist in the real string either.
namespace String_reader
{
class Program
{
static void Main(string[] args)
{
String filepath = #"C:\my file name here";
string line;
if(File.Exists(filepath))
{
StreamReader file = null;
try
{
file = new StreamReader(filepath);
while ((line = file.ReadLine()) !=null)
{
string regMatch = "ID number here"; //this is where it all falls apart.
Regex.IsMatch (line, regMatch);
Console.WriteLine (line);// When program is run it just displays the whole .txt file
}
}
}
finally{
if (file !=null)
file.Close();
}
}
Console.ReadLine();
}
}
}

Use a Regex. Something along the lines of Regex.Match("|"+inputString+"|",#"\|[ ]*\d+\|(.+?)\|").Groups[1].Value
Oh, I almost forgot; you'll need to substitute the d+ for the actual index you want. Right now, that'll just get you the first one.
The "|" before and after the input string makes sure both the index and the value are enclosed in a | for all elements, including the first and last. There's ways of doing a Regex without it, but IMHO they just make your regex more complicated, and less readable.

Assuming you have path and id.
Console.WriteLine(File.ReadAllLines(path).Where(l => l.StartsWith(id + "|")).FirstOrDefault());

Use ReadLines to get a string array of lines then string split on the |

You could use Regex.Split method

FileInfo info = new FileInfo("filename.txt");
String[] lines = info.OpenText().ReadToEnd().Split(' ');
foreach(String line in lines)
{
int id = Convert.ToInt32(line.Split('|')[0]);
string text = Convert.ToInt32(line.Split('|')[1]);
}

Read the data into a string
Split the string on "|"
Read the items 2 by 2: key:value,key:value,...
Add them to a dictionary
Now you can easily find your string with dictionary[key].

first load the hole file to a string.
then try this:
string s = "123|this data is variable| 456|this data is also variable| 789|so is this|";
int index = s.IndexOf("123", 0);
string temp = s.Substring(index,s.Length-index);
string[] splitStr = temp.Split('|');
Console.WriteLine(splitStr[1]);
hope this is what you are looking for.

private static IEnumerable<string> ReadLines(string fspec)
{
using (var reader = new StreamReader(new FileStream(fspec, FileMode.Open, FileAccess.Read, FileShare.Read)))
{
while (!reader.EndOfStream)
yield return reader.ReadLine();
}
}
var dict = ReadLines("input.txt")
.Select(s =>
{
var split = s.Split("|".ToArray(), 2);
return new {Id = Int32.Parse(split[0]), Text = split[1]};
})
.ToDictionary(kv => kv.Id, kv => kv.Text);
Please note that with .NET 4.0 you don't need the ReadLines function, because there is ReadLines
You can now work with that as any dictionary:
Console.WriteLine(dict[12]);
Console.WriteLine(dict[999]);
No error handling here, please add your own

You can use Split method to divide the entire text into parts sepparated by '|'. Then all even elements will correspond to numbers odd elements - to strings.
StreamReader sr = new StreamReader(filename);
string text = sr.ReadToEnd();
string[] data = text.Split('|');
Then convert certain data elements to numbers and strings, i.e. int[] IDs and string[] Strs. Find the index of the given ID with idx = Array.FindIndex(IDs, ID.Equals) and the corresponding string will be Strs[idx]
List <int> IDs;
List <string> Strs;
for (int i = 0; i < data.Length - 1; i += 2)
{
IDs.Add(int.Parse(data[i]));
Strs.Add(data[i + 1]);
}
idx = Array.FindIndex(IDs, ID.Equals); // we get ID from input
answer = Strs[idx];