Lines are not inserted in List

Question

Why doesn't my collection of strings (lst) appear in the console? Visual Studio does not show any obvious errors. Please point out my mistake.

public partial class Home : Page {
    public Home() {
        InitializeComponent();
    }

    // ...

    private void Button_Click(object sender, EventArgs e) {
        Home.ABC();
        MessageBox.Show("hello world");
    }

    static void ABC() {
        List<string> lst = new List<string>();
        OpenFileDialog opendialog = new OpenFileDialog();
        opendialog.Multiselect = true;
        bool? dialogResult = opendialog.ShowDialog();
        if (dialogResult.HasValue && dialogResult.Value) {
            foreach (var file in opendialog.Files) {
                Stream fileStream = file.OpenRead();
                using (StreamReader reader = new StreamReader(fileStream)) {
                    while (!reader.EndOfStream) {
                        string line=reader.ReadLine();
                        lst.Add(line);
                    }
                    Console.WriteLine(lst);
                }
            }
        }
    }
}

The message box shows hello world, so the function ABC() also runs?

enter image description here

What sort of project is this? If it's Windows Forms / WPF, it doesn't *have* a console attached to it... — Jon Skeet, Feb 18 '14 at 17:17
Console I used here for illustrative purposes. Maybe I can not use here.I added the picture.maybe it will say something??? — user3214034, Feb 18 '14 at 17:36
You added an image: When you debug the `lst.Add()` line, the statement has not yet executed and the line has not yet been added to `lst`. Therefore, `lst` appears empty. — Daniel A.A. Pelsmaeker, Feb 18 '14 at 19:53
As an aside, this line does not do what you think it does: `Console.WriteLine(lst);` — Chris Dunaway, Feb 18 '14 at 22:07

score 1 · Answer 1 · answered Feb 18 '14 at 17:18

As mentioned above, you are not using a console application and as such you cannot write to the console.

Create a RichTextBox and use

foreach(var line in lst)
{
    RichTextBoxName.AppendText(line)
}

foreach(var line in lst)
    {
        RichTextBoxName.AppendText(line + "\n") //adds a new line after each string
    }

score 0 · Answer 2 · edited May 23 '17 at 11:49

0

You cannot use a console window in a standard Winforms application. It is launched with Application.Run and shows the default dialog, rather than the console.

In order to display a console window AS WELL as a winforms dialog, you have to use Win32 API to manually create the console window.

See here:

How do I show a console output/window in a forms application?

edited May 23 '17 at 11:49

Community

1
1

answered Feb 18 '14 at 17:17

Jon Barker

1,788
15
25

score 0 · Answer 3 · answered Feb 18 '14 at 17:21

0

The console stream output isn't set to a visible console window, so Console.Write accepts the text, but doesn't display anything anywhere.

Try using Debug.WriteLine instead.

answered Feb 18 '14 at 17:21

ChristopherBrown

152
1
5

Lines are not inserted in List

3 Answers3