I'm trying to read a text file to two string arrays. Array1 is to be all the odd lines, array2 all the even lines. I then add all the items of array1 to a combobox and when that is selected, or as it gets typed, outputs array2 to a textbox.
So far, I have tried a few methods from here, but the big issue seems to be creating the arrays. I tried to get help here before, but the answers didn't actually answer my question. They must be arrays, not lists (which I tried and worked well). I am really confused by this whole thing and my attempted code is now rubbish:
private void ReadFile(string filePath, string customerPhone, string customerName)
{
string line = string.Empty;
var fileSR = new StreamReader(filePath);
bool number = true;
while((line = fileSR.ReadLine()) != null)
{
if (number)
{
customerPhone(line);
number = false;
}
else
{
customerName(line);
number = true;
}
}
fileSR.Close();
}
I'm losing confidence in this whole process, but I need to find a way to make it work, then I can learn why it does.
You are almost there, just use the List<string>.
private void ReadFile(string filePath, string customerPhone, string customerName)
{
string line = string.Empty;
using (var fileSR = new StreamReader(filePath))
{
bool number = true;
List<string> customerPhone = new List<string>();
List<string> customerName = new List<string>();
while((line = fileSR.ReadLine()) != null)
{
if (number)
{
customerPhone.Add(line);
number = false;
}
else
{
customerName.Add(line);
number = true;
}
}
fileSR.Close();
}
}
If you are interested only in Arrays, you could simply call customerName.ToArray() to convert it to an array.
Linq Solution
Alternatively you could use Linq and do this.
var bothArrays = File.ReadLines("filepath") // Read All lines
.Select((line,index) => new {line, index+1}) // index each line
.GroupBy(x=> x/2) // Convert into two groups
.SelectMany(x=> x.Select(s=>s.line).ToArray()) // Convert it to array
.ToArray();
You should use collections to return data, say IList<String>:
private static void ReadFile(String filePath,
IList<String> oddLines,
IList<String> evenLines) {
oddLines.Clear();
evenLines.Clear();
int index = 1; //TODO: start with 0 or with 1
foreach (String line in File.ReadLines(filePath)) {
if (index % 2 == 0)
evenLines.Add(line);
else
oddLines.Add(line);
index += 1;
}
}
using
List<String> names = new List<String>();
List<String> phones = new List<String>();
ReadFile(#"C:\MyDate.txt", names, phones);
// If you want array representation
String[] myNames = names.ToArray();
String[] myPhones = phones.ToArray();
// Let's print out names
Console.Write(String.Join(Envrironment.NewLine, names));
Please, notice, that using File.ReadLines usually more convenient than StreamReader which should be wrapped in using:
// foreach (String line in File.ReadLines(filePath)) equals to
using (var fileSR = new StreamReader(filePath)) {
while ((line = fileSR.ReadLine()) != null) {
...
}
}
This worked! I have these class level strings:
string cFileName = "customer.txt";
string[] cName = new string[0];
string[] cPhone = new string[0];
And then this in the Window Loaded event, but could be used in it's own method:
private void Window_Loaded_1(object sender, RoutedEventArgs e)
{
//read file on start
int counter = 0;
string line;
StreamReader custSR = new StreamReader(cFileName);
line = custSR.ReadLine();
while (custSR.Peek() != -1)
{
Array.Resize(ref cPhone, cPhone.Length + 1);
cPhone[cPhone.Length - 1] = line;
counter++;
line = custSR.ReadLine();
Array.Resize(ref cName, cName.Length + 1);
cName[cName.Length - 1] = line;
counter++;
line = custSR.ReadLine();
phoneComboBox.Items.Add(cPhone[cPhone.Length - 1]);
}
custSR.Close();
//focus when program starts
phoneComboBox.Focus();
}
Related
I have to read info from a txt file, store it in a manner (array or list), then display the data. Program must include at least one additional class.
I've hit a wall and can't progress.
string, string, double, string
name,badge,salary,position
name,badge,salary,position
name,badge,salary,position
I'm sorry and I know the code below is disastrous but I'm at a loss and am running out of time.
namespace Employees
{
class Program
{
static void Main()
{
IndividualInfo collect = new IndividualInfo();
greeting();
collect.ReadInfo();
next();
for (int i = 0; i < 5; i++)
{
displayInfo(i);
}
exit();
void greeting()
{
Console.WriteLine("\nWelcome to the Software Development Company\n");
}
void next()
{
Console.WriteLine("\n*Press enter key to display information . . . *");
Console.Read();
}
void displayInfo(int i)
{
Console.WriteLine($"\nSoftware Developer {i + 1} Information:");
Console.WriteLine($"\nName:\t\t\t{collect.nameList[i]}");
}
void exit()
{
Console.WriteLine("\n\n*Press enter key to exit . . . *");
Console.Read();
Console.Read();
}
}
}
}
class IndividualInfo
{
public string Name { get; set; }
//public string Badge{ get; set; }
//public string Position{ get; set; }
//public string Salary{ get; set; }
public void ReadInfo()
{
int i = 0;
string inputLine;
string[] eachLine = new string[4];
string[,] info = new string[5, 4]; // 5 developers, 4x info each
StreamReader file = new StreamReader("data.txt");
while ((inputLine = file.ReadLine()) != null)
{
eachLine = inputLine.Split(',');
for (int x = 0; x < 5; x++)
{
eachLine[x] = info[i, x];
x++;
}
i++;
}
string name = info[i, 0];
string badge = info[i, 1];
string position = info[i, 2];
double salary = Double.Parse(info[i, 3]);
}
public List<string> nameList = new List<string>();
}
So far I think I can collect it with a two-dimensional array, but a List(s) would be better. Also, the code I've posted up there won't run because I can't yet figure out a way to get it to display. Which is why I'm here.
using System.IO;
static void Main(string[] args)
{
using(var reader = new StreamReader(#"C:\test.csv"))
{
List<string> listA = new List<string>();
List<string> listB = new List<string>();
while (!reader.EndOfStream)
{
var line = reader.ReadLine();
var values = line.Split(';');
listA.Add(values[0]);
listB.Add(values[1]);
}
}
}
https://www.rfc-editor.org/rfc/rfc4180
or
using Microsoft.VisualBasic.FileIO;
var path = #"C:\Person.csv"; // Habeeb, "Dubai Media City, Dubai"
using (TextFieldParser csvParser = new TextFieldParser(path))
{
csvParser.CommentTokens = new string[] { "#" };
csvParser.SetDelimiters(new string[] { "," });
csvParser.HasFieldsEnclosedInQuotes = true;
// Skip the row with the column names
csvParser.ReadLine();
while (!csvParser.EndOfData)
{
// Read current line fields, pointer moves to the next line.
string[] fields = csvParser.ReadFields();
string Name = fields[0];
string Address = fields[1];
}
}
http://codeskaters.blogspot.ae/2015/11/c-easiest-csv-parser-built-in-net.html
or
LINQ way:
var lines = File.ReadAllLines("test.txt").Select(a => a.Split(';'));
var csv = from line in lines
select (from piece in line
select piece);
^^Wrong - Edit by Nick
It appears the original answerer was attempting to populate csv with a 2 dimensional array - an array containing arrays. Each item in the first array contains an array representing that line number with each item in the nested array containing the data for that specific column.
var csv = from line in lines
select (line.Split(',')).ToArray();
This question was fully addressed here:
Reading CSV file and storing values into an array
I am trying to make use of StreamReader and taking data from text files and store it into an array. I am having an issue where I think the fix is simple, but I am stumped. When I print the array, it prints every single token in the txt file instead of the single line of data containing the search name along with the 11 int tokens.
Long_Name.txtsample
public class SSA
{
public void Search()
{
Console.WriteLine("Name to search for?");
string n = Console.ReadLine();
Search(n, "Files/Names_Long.txt");
}
public int[] Search(string targetName, string fileName)
{
int[] nums = new int[11];
char[] delimiters = { ' ', '\n', '\t', '\r' };
using (TextReader sample2 = new StreamReader("Files/Exercise_Files/SSA_Names_Long.txt"))
{
string searchName = sample2.ReadLine();
if (searchName.Contains(targetName))
{
Console.WriteLine("Found {0}!", targetName);
Console.WriteLine("Year\tRank");
}
else
Console.WriteLine("{0} was not found!", targetName);
while (searchName != null)
{
string[] tokensFromLine = searchName.Split(delimiters, StringSplitOptions.RemoveEmptyEntries);
int arrayIndex = 0;
int year = 1900;
foreach (string token in tokensFromLine)
{
int arrval;
if (int.TryParse(token, out arrval))
{
nums[arrayIndex] = arrval;
year += 10;
Console.WriteLine("{0}\t{1}", year, arrval);
arrayIndex++;
}
}
searchName = sample2.ReadLine();
}
}
return nums;
}
}
That sure is a lot of code, this snippet does not account for duplicates but if you were willing to work with linq, something like this might help? You could also just iterate over the file_text array using a for-loop and perhaps set your return array in that. Anyway a lot less code to mess with
public int[] Search(string targetName, string fileName)
{
List<string> file_text = File.ReadAllLines("Files/Exercise_Files/SSA_Names_Long.txt").ToList();
List<string> matching_lines = file_text.Where(w => w == targetName).ToList();
List<int> nums = new List<int>();
foreach (string test_line in matching_lines)
{
nums.Add(file_text.IndexOf(test_line));
}
return nums.ToArray();
}
The purpose of my program is to take a data txt file and edit it, and/or make additions and subtractions to it.
The text file format is like this:
Name|Address|Phone|# of people coming|isRSVP
The code I have seems to be doing it's job all the way up until I try to click one of the names within a listbox and it needs to search through the multidimensional array to pull information out and place within a set of textboxes where they can be edited. The problem is that the foreach loop I use gives me an out of bounds exception. I tried to do a step into debug to make sure the data is correct in the array and see the process. Everything seems to do correctly but for some reason in the conditional statement person[0]==listbox1.selectedIndex isn't returning true even though both are the same as I seen through the step into process. Any help would be greatly appreciated.
This is my code:
StringBuilder newFile = new StringBuilder();
static string txtList= "guest_list.txt";
static string[] file = File.ReadAllLines(txtList);
static int x = file.Count();
string[,] list = new string[x ,5];
public void loadGuestList()
{
int count2 = 0;
foreach (string line in file)
{
string[] sliced = line.Split('|');
int count = 0;
list[count2, count] = sliced[0];
count++;
list[count2, count] = sliced[1];
count++;
list[count2,count] = sliced[2];
count++;
list[count2,count]= sliced[3];
count++;
list[count2, count] = sliced[4];
count++;
listBox1.Items.Add(list[count2,0]);
count2++;
}
}
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
foreach (string person in list)
{
if ( person[0].ToString()==listBox1.SelectedItem.ToString())
{
addTxt.Text = char.ToString(person[1]);
textPhone.Text = char.ToString(person[2]);
textPeople.Text = char.ToString(person[3]);
if (person[4] == 'n' )
{
}
else
{
chkRSVP.Checked = true;
}
break;
}
}
}
The problem lies in this line:
foreach (string person in list)
The list is defined as being string[,] which when you for each over will do every element, not just the column of data. You really should do something such as:
for(int index = 0; index <= list.GetUpperBound(0); index++)
{
string slice1 = list[index, 0];
string slice2 = list[index, 1];
....
}
or switch to using a Dictionary<string, string[]>().
Try to use a "Person" object and override equals(). Right now you're trying to put your multidimensional array (list[0]) into a string, it'll give you a unwanted result. You should use list[0,0] instead.
In agreement with Adam Gritt, I tested the following code and it seemed to work:
using System;
namespace so_foreach_bounds
{
class MainClass
{
public static void Main (string[] args)
{
//System.Text.StringBuilder newFile = new System.Text.StringBuilder();
string txtList= "guest_list.txt";
string[] file = System.IO.File.ReadAllLines(txtList);
int x = file.Length;
System.Collections.Generic.List<string[]> list = new System.Collections.Generic.List<string[]> ();
foreach (string line in file)
{
string[] sliced = line.Split('|');
list.Add(sliced);
}
foreach (string[] person in list)
{
Console.WriteLine (String.Join(", ", person));
if (person[0] =="Gary")
{
string txtAdd = person[1];
string txtPhone = person[2];
string txtpeople = person[3];
if (person[4] == "n" )
{
}
else
{
bool has_resvped = true;
}
break;
}
}
}
}
}
The issue is how you are iterating over the 2d array. It is usually a better idea to create a "Person" class, than try to manage it via arrays though. Oh yes, and it's usually a good idea to check that a list box item is selected before attempting to use one of its members.
I have looked all over for the answer to this, but I can't find it anywhere. I need to be able to clear a line from a txt file by the last integer in the line (the ID number), but I have no idea how to do that. Please help? Basically I was thinking that I need to find the last integer, and if it does not equal to the input, then it would move to the next line until it finds the right integer. Then that line is cleared. Here is some of my code that obviously doesn't work:
public static void TicID(CommandArgs args)
{
if (args.Parameters.Count == 1)
{
if (i == 1)
{
try
{
string idToDelete = args.Parameters[0];
StreamReader idreader = new StreamReader("Tickets.txt");
StreamWriter iddeleter = new StreamWriter("Tickets.txt");
string id = Convert.ToString(idreader.Read());
string line = null;
while (idreader.Peek() >= 0)
{
if (String.Compare(id, idToDelete) == 0)
{
iddeleter.WriteLine(line);
}
else
{
idreader.ReadLine();
}
}
}
The most straightforward way to delete lines is to write the lines that should not be deleted:
var idToDelete = "1";
var path = #"C:\Temp\Test.txt";
var lines = File.ReadAllLines(path);
using (var writer = new StreamWriter(path, false)) {
for (var i = 0; i < lines.Length; i++) {
var line = lines[i];
//assuming it's a CSV file
var cols = line.Split(',');
var id = cols[cols.Length - 1];
if (id != idToDelete) {
writer.WriteLine(line);
}
}
}
This is the LINQ-way:
var lines = from line in File.ReadAllLines(path)
let cols = line.Split(',')
let id = cols[cols.Length - 1]
where id != idToDelete
select line;
File.WriteAllLines(path, lines);
Create a StreamReader object and read line by line into a string array or something like that using StreamReader's instance method ReadLine() and now find your line of choice in your text array and delete it.
Important note:
do { /*see description above*/ } while (streamReader.Peak() != -1);
I have a situation where I am given a text file with text formatted as follows:
C:\Users\Admin\Documents\report2011.docx: My Report 2011
C:\Users\Admin\Documents\newposter.docx: Dinner Party Poster 08
How would it be possible to trim the text file, so to trim the ":" and all characters after it.
E.g. so the output would be like:
C:\Users\Admin\Documents\report2011.docx
C:\Users\Admin\Documents\newposter.docx
Current Code:
private void button1_Click(object sender, EventArgs e)
{
using (StreamWriter sw = File.AppendText(#"c:\output.txt"))
{
StreamReader sr = new StreamReader(#"c:\filename.txt");
Regex reg = new Regex(#"\w\:(.(?!\:))+");
List<string> parsedStrings = new List<string>();
while (sr.EndOfStream)
{
sw.WriteLine(reg.Match(sr.ReadLine()).Value);
}
}
}
Not working :(
int index = myString.LastIndexOf(":");
if (index > 0)
myString= myString.Substring(0, index);
Edit - Added answer based on modified question. It can be condensed slightly, but left expanded for clarity of what's going on.
using (StreamWriter sw = File.AppendText(#"c:\output.txt"))
{
using(StreamReader sr = new StreamReader(#"input.txt"))
{
string myString = "";
while (!sr.EndOfStream)
{
myString = sr.ReadLine();
int index = myString.LastIndexOf(":");
if (index > 0)
myString = myString.Substring(0, index);
sw.WriteLine(myString);
}
}
}
Edited
StreamReader sr = new StreamReader("yourfile.txt");
Regex reg = new Regex(#"\w\:(.(?!\:))+");
List<string> parsedStrings = new List<string>();
while (!sr.EndOfStream)
{
parsedStrings.Add(reg.Match(sr.ReadLine()).Value);
}
sure. while reading each line, do a
Console.WriteLine(line.Substring(0,line.IndexOf(": "));
i'd use the answer given here Code to trim part of a text file in C# and find the 2nd occurrence and then use it in substring.
var s = #"C:\Users\Admin\Documents\report2011.docx: My Report 2011";
var i = GetNthIndex(s,':',2);
var result = s.Substring(i+1);
public int GetNthIndex(string s, char t, int n)
{
int count = 0;
for (int i = 0; i < s.Length; i++)
{
if (s[i] == t)
{
count++;
if (count == n)
{
return i;
}
}
}
return -1;
}
Assuming this is being done where the files are supposed to exist, you could handle this taking into account any colons in the (what I assume is) description by checking for the existence of the files after you get the index of the colon.
List<string> files = new List<string>();
files.Add(#"C:\Users\Admin\Documents\report2011.docx: My Report 2011");
files.Add(#"C:\Users\Admin\Documents\newposter.docx: Dinner Party Poster 08");
files.Add(#"C:\Users\Admin\Documents\newposter.docx: Dinner Party: 08");
int lastColon;
string filename;
foreach (string s in files)
{
bool isFilePath = false;
filename = s;
while (!isFilePath)
{
lastColon = filename.LastIndexOf(":");
if (lastColon > 0)
{
filename = filename.Substring(0, lastColon);
if (File.Exists(filename))
{
Console.WriteLine(filename);
isFilePath = true;
}
}
else
{
throw new FileNotFoundException("File not found", s);
}
}
}
Try this:
more faster:
string s = #"C:\Users\Admin\Documents\report2011.docx: My Report 2011";
string path = Path.GetDirectoryName(s) + s.Split(new char[] { ':' }) [1];
Console.WriteLine(path); //C:\Users\Admin\Documents\report2011.docx
you need import System.IO
you could use split:
string[] splitted= myString.Split(':');
Then you get an array where you take the first one.
var mySplittedString = splitted[0]
Have a look here if you need more information on this.
EDIT: In your case you get an array with the size of at least 3 so you need to get splitted[0] and splitted[ 1]