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C#•9mo ago

✅ Error with Displaying txt file in a Listbox

Hello, I am having some issues getting a text file to display it's contents in a generated display. Apparently when I run the debugger, it ends up displaying the contents in a seperate page with an additional txt extension attached to it. Can someone tell me what the problem is here? https://paste.mod.gg/qdpmcphcwgrr/0

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42 Replies

leowest•9mo ago

can u maybe post a screenshot of what happens

Gamer1234556•9mo ago

Ok sure

leowest•9mo ago

from the code alone is being hard to figure out what hte actual issue is

Gamer1234556•9mo ago

No description

Gamer1234556•9mo ago

This is what I am getting, it's supposed to display in the listbox Should I send the UI of my application as well?

Gamer1234556•9mo ago

Here it is in case you need it to understand what is going on

No description

leowest•9mo ago

@Gamer1234556 I suspect your try and catch clause if bubbling it try removing it commenting it

Gamer1234556•9mo ago

What do I replace it with?

leowest•9mo ago

nothing just comment the try and catch

        private void DisplayFileContents(string filePath)
        {
            //try
            //{
                string fileContent = File.ReadAllText(filePath);
                GenerateValueDisplay.Text = fileContent;
            //}
            //catch (Exception ex)
            //{
            //    MessageBox.Show($"Error reading file: {ex.Message}");
            //}
        }

        private void DisplayFileContents(string filePath)
        {
            //try
            //{
                string fileContent = File.ReadAllText(filePath);
                GenerateValueDisplay.Text = fileContent;
            //}
            //catch (Exception ex)
            //{
            //    MessageBox.Show($"Error reading file: {ex.Message}");
            //}
        }

Gamer1234556•9mo ago

Yeah it seems like there are no changes

leowest•9mo ago

super weird behavior then, can you show me your winform code the designer why did u have a try and catch there in first place?

Gamer1234556•9mo ago

https://paste.mod.gg/hkzfirtbjmop/0

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Gamer1234556•9mo ago

It worked before when I originally had a read-only text box. It was to check whether or not the dragged file was a txt file

leowest•9mo ago

ah I see the issue GenerateValueDisplay is a ListBox not a textbox so GenerateValueDisplay.Items.Add(fileContent)

Pobiega•9mo ago

and that wont play very nicely, since your "items" is just a single long string a listbox is for many items, not a single one

leowest•9mo ago

yep it wouldn't unless he processes it first to split by , and add the array which would make more sense since he wants to sort it in different ways

Pobiega•9mo ago

yup we've had that exact problem before with the int.Parse, remember? 😄

leowest•9mo ago

me?

Pobiega•9mo ago

no, Gamer

Gamer1234556•9mo ago

Yeah

leowest•9mo ago

:catlaugh:

Gamer1234556•9mo ago

I have been posting here for a while Pobiega has been a great help for me

leowest•9mo ago

so if u do the change above does it work?

Gamer1234556•9mo ago

Well it works but it displays as one item So that's wrong

leowest•9mo ago

yes it is but it works so u know what to do now right?

Gamer1234556•9mo ago

I think so... Do you have any pointers as for getting it to display as multiple items instead of one?

leowest•9mo ago

read from there 😉 what happens when u do that to a string what u get in result?

Gamer1234556•9mo ago

Yeah it's supposed to be an array

leowest•9mo ago

yep which are multiple items 😉 and if u add 1 by 1 to the list box what happens?

Gamer1234556•9mo ago

Hold on, I am overhauling the code to get the functionality to work

leowest•9mo ago

tyt

Gamer1234556•9mo ago

Ok, so here is what I have now, but apparently it just skips over whatever items whenever it tries to parse through the text.

c#
//***********************************************************************************
//Program: DisplayFileContents()
//Description: Catches an error if the file doesn't have valid tokens.
//Date: Feb. 07/2024
//Author: Allen Keettikkal
//Course: CMPE1666
//Class: A02
//***********************************************************************************
private void DisplayFileContents(string filePath)
{
    try
    {
        // Read all lines from the file
        string[] fileContent = File.ReadAllLines(filePath);

        // Convert lines to integer
        // Update the listbox with file contents
        GenerateValueDisplay.Items.Clear();

        // Extract integers from lines and store in generatedArray
        List<int> values = new List<int>();
        foreach (string line in fileContent)
        {
            string[] parts = line.Split(',');
            foreach (string part in parts)
            {
                if (int.TryParse(part.Trim(), out int value))
                {
                    values.Add(value);
                }
                else
                {
                    MessageBox.Show($"Invalid value found: {part.Trim()}. Skipping...");
                }
            }
        }
        generatedArray = values.ToArray();
    }
    catch (Exception ex)
    {
        MessageBox.Show($"Error reading file: {ex.Message}");
    }
}

c#
//***********************************************************************************
//Program: DisplayFileContents()
//Description: Catches an error if the file doesn't have valid tokens.
//Date: Feb. 07/2024
//Author: Allen Keettikkal
//Course: CMPE1666
//Class: A02
//***********************************************************************************
private void DisplayFileContents(string filePath)
{
    try
    {
        // Read all lines from the file
        string[] fileContent = File.ReadAllLines(filePath);

        // Convert lines to integer
        // Update the listbox with file contents
        GenerateValueDisplay.Items.Clear();

        // Extract integers from lines and store in generatedArray
        List<int> values = new List<int>();
        foreach (string line in fileContent)
        {
            string[] parts = line.Split(',');
            foreach (string part in parts)
            {
                if (int.TryParse(part.Trim(), out int value))
                {
                    values.Add(value);
                }
                else
                {
                    MessageBox.Show($"Invalid value found: {part.Trim()}. Skipping...");
                }
            }
        }
        generatedArray = values.ToArray();
    }
    catch (Exception ex)
    {
        MessageBox.Show($"Error reading file: {ex.Message}");
    }
}

leowest•9mo ago

before using line I recommend u to check if its not null or empty on the Split method might also be worth adding to it the parameter to exclude empty elements after ',' if u put a , it will give u the option to add a StringSplitOptions enum aside from that you're not adding anyting to the listbox a few things on the file u linked:

        if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
        {
            MessageBox.Show("Invalid file path.");
            return;
        }

        // Read all lines from the file
        string[] fileContent = File.ReadAllLines(filePath);

        // Check if file content is empty
        if (fileContent == null || fileContent.Length == 0)
        {
            MessageBox.Show("File is empty.");
            return;
        }

        if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
        {
            MessageBox.Show("Invalid file path.");
            return;
        }

        // Read all lines from the file
        string[] fileContent = File.ReadAllLines(filePath);

        // Check if file content is empty
        if (fileContent == null || fileContent.Length == 0)
        {
            MessageBox.Show("File is empty.");
            return;
        }

you dont need to check if filepath is null File.Exists will fail for both so u can just use File.Exists there fileContent you dont need to check either if its empty your loop will be skiped

// Update the listbox with file contents
        GenerateValueDisplay.Items.Clear();
        GenerateValueDisplay.Items.AddRange(fileContent);

// Update the listbox with file contents
        GenerateValueDisplay.Items.Clear();
        GenerateValueDisplay.Items.AddRange(fileContent);

U dont want to call GenerateValueDisplay.Items.AddRange(fileContent); u want to do that after you processed the files on your resulting array

foreach (string line in fileContent)
{
    // Split line by commas, excluding empty entries
    string[] parts = line.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

foreach (string line in fileContent)
{
    // Split line by commas, excluding empty entries
    string[] parts = line.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

what happens if line is empty or null there? it would crash on the line.split so you want to check line before u use it on the split to ensure its not empty, if its empty just continue to the next line then

generatedArray = values.ToArray();

generatedArray = values.ToArray();

this is where u were suppose to fill your list but instead you're filling something else

Gamer1234556•9mo ago

Ok, I managed to get the DisplayFileContents() working. I needed to make a complete overhaul of the function since textboxes and listboxes are very different and now it is working. The problem now is the sorting algorithms aren't working since the array doesn't seem to exist. You want me to link the code?

leowest•9mo ago

sure

Gamer1234556•9mo ago

https://paste.mod.gg/vroztmsfisel/0

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leowest•9mo ago

doesn't GenerateValueDisplay.Items gives u a string array u can use to sort? u would take a copy of it work with it then update the listbox again ah I see it have its own object so you would have to create a field to store your array aside from feeding your listbox and if u modify your field u would update your list box with it alternatively you could cast the listbox item to your type into an array but if this is a homework it probably wont be accepted

listBox1.Items.Cast<string>().ToArray()

listBox1.Items.Cast<string>().ToArray()

this assumes your time was originally of type string in your listbox if it was not it would fail you also have to fix all your methods using .Text

Gamer1234556•9mo ago

Well I changed DisplayFileContents() to return a list But now I might have to change some of the code to accomodate this

Gamer1234556•9mo ago

https://paste.mod.gg/fnsphmbcrfiu/0

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Gamer1234556•9mo ago

What are some changes to be made here?

leowest•9mo ago

SortedValueDisplay.Text I suppose but I guess now u should try and see what is not working and if u can fix your self without me telling u and if u can't then ask us ;P

Gamer1234556•9mo ago

Ok Yeah I fixed up code and it’s working properly Thanks for the help This place has been a ton of help for me

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