Develop Reference

C#: Read line from file & determine if it contains a substring

I am working on a program for personal use that will automatically sort a grocery list (from file) into a particular order. I want the program to open the file, read each line, and determine if each line contains certain words. For example, a line could contain "chicken breasts," and the program would just recognize that it contained "chicken." The idea is to have the program automatically order my list so that I'm not running back and forth getting items when I go to the store. Currently the external file line must have the exact text "chicken" for the program to recognize it ("chicken breasts" will not be recognized). Here is the section that I believe is giving me trouble:
if (groceries.Contains("chicken"))
{
chicken = "Chicken";
lstItems.Items.Add(chicken);
}
Groceries is an array with each element being a line from the file (I think I created it correctly). Below is the entire code:
private void btnImport_Click(object sender, EventArgs e)
{
//Grocery items
string chicken;
//StreamReader variable
StreamReader readFile;
string filePath;
//Counter variable
int index = 0;
//Display open file dialog box
OpenFileDialog openFileDialog1 = new OpenFileDialog();
openFileDialog1.ShowDialog();
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
//Set filepath as a variable
filePath = openFileDialog1.FileName;
// Assign the file as a variable
readFile = File.OpenText(filePath);
//Count lines in file and create array
int lineCount = File.ReadLines(filePath).Count();
string[] groceries = new string[lineCount];
//Read file's contents
while (index < groceries.Length && !readFile.EndOfStream)
{
groceries[index] = readFile.ReadLine();
index++;
if (groceries.Contains("chicken"))
{
chicken = "Chicken";
//Display items in label
lstItems.Items.Add(chicken);
}
}
//Close file
readFile.Close();
}
}
When the program is run, it will add "Chicken" to the listbox the same number of times as the number of lines in the file, even though only one line actually contains "chicken." My question is: How can I make it pick out the keyword from a longer line of text, and why is it adding the item more than once? Thanks!
Edit
(Sorry I don't know how to attach a file here)
I am currently importing a .txt file with the following data:
chicken
fish
Frosted Flakes cereal
pork tenderloin
ground beef

First, you need to remove the redundant openFileDialog1.ShowDialog();. And access the elements in groceries by index. Then add additional conditions to exclude rows that contain "chicken breasts". Note that index++ is executed after the if statement.
// define a varibale
bool chickenadded = false;
OpenFileDialog openFileDialog1 = new OpenFileDialog();
// remove the redundant ShowDialog
if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
// code omitted ...
//Read file's contents
while (index < groceries.Length && !readFile.EndOfStream)
{
groceries[index] = readFile.ReadLine();
// check here
if (groceries[index].Contains("chicken") && !chickenadded /*&& !groceries[index].Contains("chicken breasts")*/)
{
chicken = "Chicken";
lstItems.Items.Add(chicken);
// set to true
chickenadded = true;
// another way is not define boolean, just use "break"
break;
}
// reset index here
index++;
}

Disregarding any other problem or what the overall goal of the application is. You forgot to look at the actual line
if (groceries[index].Contains("chicken"))
It's worth a note that you should likely be using File.ReadLines or File.ReadAllLines instead. As it gives you a collection or enumerable to work with

Reading From TXT File to Separate Text Boxes

I have been out of the coding game for quite some time now and have forgot most of what I knew. I am looking to be able to read individual lines from a txt file and append them to separate textboxes but keep getting stumped and i'm running out of time for my deadline.
I want the code to do something like this:
Read (Line 1) from (User.txt)
Append (Line 1) to (txtFirstName)
Read (Line 2) from (User.txt)
Append (Line 2) to (txtLastName)
If possible i'd like to have the txt file read in as an array so that the individual lines can be used to fill separate textboxes.
Okay, so what I had written was this:
private void btnUser_Click(object sender, EventArgs e)
{
if(lstbUsers.Text == "Jordan Atkinson")
{
TextReader reader = new StreamReader(#"*FILEADDRESS*Jordan.txt");
txtUserFirstName.Text = reader.ReadLine();
string[] lines = System.IO.File.ReadAllLines(#"*FILEADDRESS*Jordan.txt");
foreach (string line in lines)
{
lstvUsers.Items.Add(line);
}
}
}
However, using the reader.ReadLine() only reads the top line and I want to be able to specify what line I want to read from.

If you want to read just a specific line from your file, you can do that this way:
int lineNumber = 10; // the line which you want to read
string line = File.ReadLines(pathToFile).Skip(lineNumber - 1).First();
This code will return the 10th line of your file. If you want to append this string to another, you can simply use the += operator or StringBuilder class.

c# stream reader reading text file into richtextbox inbetween [] tags

I have a text file that i want to read into a richtextbox on my form using a button
Here is the text file:
[1]
Hello this is a text file. I am reading this into a richtextbox.
I want multiple rows into the textbox to display on one button click.
[/1]
Here is my code:
private void button2_Click(object sender, EventArgs e)
{
using (StreamReader reader = new StreamReader(#"F:\test.txt"))
{
bool content = false;
while ((line = reader.ReadLine()) != null)
{
if (line.Contains("[1]"))
{
content = true;
}
if (content == true)
{
txtContent.AppendText(reader.ReadLine());
}
if (line.Contains("[/1]"))
{
content = false;
break;
//txtContent.AppendText(reader.ReadLine());
}
}
}
}
When i click button2 it only adds the first line
how can i read all the text in between [1] and [/1]
I have looked into the use of XML but my text file will have alot of data in by the end so ive tried to avoid using it.
I would like to then go onto using the same richtextbox to store text inbetween [2] and [/2] on another button click
Thanks for your help

Your logic looks like it may skips lines.
You read a line in from the file and if it contains [1] you set your flag. Then you check if your flag is set and read another line from the file. So this won't include the previously read line. Then you check if that next line contains[/1] and break from your reading loop.
Say you read your first line and its "[1]Hello this is a text file." Your logic will not include "Hello this is a text file" in the RichTextBox, because you've requested the next line to be read. Then you check for your end tag ([/1]), which would result in false. Now we come back to the top of the loop and read the next line ("I am reading this into a richtextbox."). This will fail your first check, and your content flag is still true so now this current line will not be added to the RichTextBox because we did another ReadLine().
Now your question is stated like the beginning tag ([1]) is on a line by itself. If that's true, then just continue your loop after you set the content flag to true.
If you don't want your tags [1] and [/1] to not be in the RichTextBox then Replace them in the line variable and add the line variable to your RichTextBox. Don't read another line to add to your RichTextBox, just use the line you already read in if it meets your condition of being between your tags.
This snippet should handle all (generic formats) of your file, unless your tags appear again within your tags (For example, "[1][1][/1][/1]")
private void button2_Click(object sender, EventArgs e)
{
using (StreamReader reader = new StreamReader (#"F:\test.txt"))
{
bool content = false;
while ((line = reader.ReadLine()) != null)
{
if (line.Contains("[1]"))
{
content = true;
// You only need this continue if this is on a line by itself
continue;
}
if (content == true)
{
// The Replace should remove your tags and add what's left to the RichTextBox
txtContent.AppendText(line.Replace("[1]", "").Replace("[/1]", ""));
}
if(line.Contains("[/1]"))
{
content = false;
break;
}
}
}
}

How to get the file info which is selected in a listBox?

I have a Windows application that takes the data in the textboxes and writes them into a randomly generated text file, kinda keeping logs. Then there is this listbox that lists all these separate log files. The thing I want to do is to have another listbox display the file info of the selected one, the 2nd, 7th, 12th, ..., (2+5n)th lines of the text files that is selected after the button 'list info' is clicked. How is it possible to do this?
My code to update the first listbox is:
private void button2_Click(object sender, EventArgs e)
{
listBox1.Items.Clear();
DirectoryInfo dinfo = new DirectoryInfo(#"C:\Users\Ece\Documents\Testings");
// What type of file do we want?...
FileInfo[] Files = dinfo.GetFiles("*.txt");
// Iterate through each file, displaying only the name inside the listbox...
foreach (FileInfo file in Files)
{
listBox1.Items.Add(file.Name + " " +file.CreationTime);
}
}

On the SelectedIndexChanged event you want to get the selected item. I wouldn't suggest showing the second part in another list box, but i'm sure you can work out how from the example below if you require it. I would personally have a richTextBox, and just read the file to there:
//Get the FileInfo from the ListBox Selected Item
FileInfo SelectedFileInfo = (FileInfo) listBox.SelectedItem;
//Open a stream to read the file
StreamReader FileRead = new StreamReader(SelectedFileInfo.FullName);
//Read the file to a string
string FileBuffer = FileRead.ReadToEnd();
//set the rich text boxes text to be the file
richTextBox.Text = FileBuffer;
//Close the stream so the file becomes free!
FileRead.Close();
Or if you are persistant to sticking with the ListBox then:
//Get the FileInfo from the ListBox Selected Item
FileInfo SelectedFileInfo = (FileInfo) listBox.SelectedItem;
//Open a stream to read the file
StreamReader FileRead = new StreamReader(SelectedFileInfo.FullName);
string CurrentLine = "";
int LineCount = 0;
//While it is not the end of the file
while(FileRead.Peek() != -1)
{
//Read a line
CurrentLine = FileRead.ReadLine();
//Keep track of the line count
LineCount++;
//if the line count fits your condition of 5n + 2
if(LineCount % 5 == 2)
{
//add it to the second list box
listBox2.Items.Add(CurrentLine);
}
}
//Close the stream so the file becomes free!
FileRead.Close();

Path Display in Label

Are there any automatic methods for trimming a path string in .NET?
For example:
C:\Documents and Settings\nick\My Documents\Tests\demo data\demo data.emx
becomes
C:\Documents...\demo data.emx
It would be particularly cool if this were built into the Label class, and I seem to recall it is--can't find it though!

Use TextRenderer.DrawText with TextFormatFlags.PathEllipsis flag
void label_Paint(object sender, PaintEventArgs e)
{
Label label = (Label)sender;
TextRenderer.DrawText(e.Graphics, label.Text, label.Font, label.ClientRectangle, label.ForeColor, TextFormatFlags.PathEllipsis);
}
Your code is 95% there. The only
problem is that the trimmed text is
drawn on top of the text which is
already on the label.
Yes thanks, I was aware of that. My intention was only to demonstrate use of DrawText method. I didn't know whether you want to manually create event for each label or just override OnPaint() method in inherited label. Thanks for sharing your final solution though.

# lubos hasko Your code is 95% there. The only problem is that the trimmed text is drawn on top of the text which is already on the label. This is easily solved:
Label label = (Label)sender;
using (SolidBrush b = new SolidBrush(label.BackColor))
e.Graphics.FillRectangle(b, label.ClientRectangle);
TextRenderer.DrawText(
e.Graphics,
label.Text,
label.Font,
label.ClientRectangle,
label.ForeColor,
TextFormatFlags.PathEllipsis);

Not hard to write yourself though:
public static string TrimPath(string path)
{
int someArbitaryNumber = 10;
string directory = Path.GetDirectoryName(path);
string fileName = Path.GetFileName(path);
if (directory.Length > someArbitaryNumber)
{
return String.Format(#"{0}...\{1}",
directory.Substring(0, someArbitaryNumber), fileName);
}
else
{
return path;
}
}
I guess you could even add it as an extension method.

What you are thinking on the label is that it will put ... if it is longer than the width (not set to auto size), but that would be
c:\Documents and Settings\nick\My Doc...
If there is support, it would probably be on the Path class in System.IO

You could use the System.IO.Path.GetFileName method and append that string to a shortened System.IO.Path.GetDirectoryName string.

Next code works for folders. I'm using it to display a download path!
public static string TrimPath(string path) {
string shortenedPath = "";
string[] pathParts = path.Split('\\');
for (int i = 0; i < pathParts.Length-1; i++) {
string part = pathParts[i];
if (pathParts.Length-2 != i) {
if (part.Length > 5) { //If folder name length is bigger than 5 chars
shortenedPath += "..\\";
}
else {
shortenedPath += part+"\\";
}
}
else {
shortenedPath += part+"\\";
}
}
return shortenedPath;
}
Example:
Input:
C:\Users\Sandra\Desktop\Proyectos de programación\Prototype\ServerClient\test
output:
C:\Users\..\..\..\..\..\test\