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Form to display file contents?

Posted on 2014-01-03
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Last Modified: 2015-03-10
VS 2008 C# 3.5

I need the quick and dirty version of how to:

1.

read the content of a file (or two files at the most) into a varible

2.

open a new form from a windows application

3.

display the contents of that file (those files) on that form.

are there any code examples of this that I can take a look at? i'm open to other options for performing this same task. i don't want the displayed content to be editable.
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Question by:mikesExpertExchange
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by:käµfm³d 👽
ID: 39754791
What are we talking about here? Text files? PDFs? Video files?
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by:mikesExpertExchange
ID: 39754809
Sorry, yes just text files.
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käµfm³d   👽 earned 500 total points
ID: 39754834
I think I'd just pass the forms application the path to the file, and let it open up the file itself, rather than pass it the text. For this purpose, you could do something like the following:

Main Application
string filename = "path\to\text\file.txt";

filename = "\"" + filename + "\"";  // Add quotes to ensure that paths containing spaces are sent correctly

System.Diagnostics.Process.Start(@"path\to\forms\application.exe", filename);

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Forms Application
public class Form1 : Form
{
    protected void Form1_Load(object sender, EventArgs e)
    {
        string[] arguments = Environment.GetCommandLineArgs();
        string textFilename = arguments[1];  // Add error checking for IndexOutOfRange

        this.textBox1.Text = System.IO.File.ReadAllText(textFilename);
    }
}

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by:mikesExpertExchange
ID: 39754885
@kaufmed: Thank you. How do I make the file read only?
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by:käµfm³d 👽
ID: 39754888
The file itself, or the data on the form?
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Author Comment

by:mikesExpertExchange
ID: 39754895
The file itself.
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Expert Comment

by:käµfm³d 👽
ID: 39754951
Well, your application won't be doing any writing to the file, so it is effectively read-only. If you need to explicitly have your code set this attribute on the file, well that is a different story, but can be achieved. Note, though, that setting this attribute really means nothing for your application unless your application is actually trying to write to the file.
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by:mikesExpertExchange
ID: 39754965
My application only needs to display the file. It won't be doing any writing to it other than for its intial creation. Matter of fact, I look for and delete the file (if it exits) before creating/writing to it again. It is truly only for displaying of content from other files that actually do get processed later on. How do I get my code to set this file's attribute to read only, before I open it?
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by:käµfm³d 👽
ID: 39754979
If you set it, then you won't be able to delete the file. To answer your question:

System.IO.FileInfo yourFile = new System.IO.FileInfo(@"path\to\your\text\file.txt");

yourFile.IsReadOnly = true;

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by:mikesExpertExchange
ID: 39755119
this is my code:

                        StreamWriter sw1 = new StreamWriter(@"FileContent.txt", true);
                        sw1.WriteLine(content);
                        sw1.Close();
                        System.Diagnostics.Process.Start("notepad.exe", @"FileContent.txt");
                        FileInfo myFile1 = new FileInfo(@"FileContent.txt");
                        myFile1.IsReadOnly = true;    

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as it stands, i can still edit the file when it opens. what am i doing wrong?
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by:käµfm³d 👽
ID: 39755202
as it stands, i can still edit the file when it opens. what am i doing wrong?
That depends on what you mean. If by "edit the file" you mean you can manipulate the text that you see on the form, well then I must tell you that you are not really editing the file. You are editing the text that is in the text box. To prevent such edits, change the ReadOnly property of the text box to True in the designer.
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Author Comment

by:mikesExpertExchange
ID: 39755216
Oh, that's the thing, its actually opening up a notepad file (.txt) with content. there is no textbox.
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Expert Comment

by:käµfm³d 👽
ID: 39755272
My fault. I didn't look at your last code sample. Try moving the readonly code above the code that launches notepad.
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Author Comment

by:mikesExpertExchange
ID: 39759802
@kaufmed: i tried this but to no avail.

                        FileInfo myFile1 = new FileInfo(@"FileContent.txt");
                        myFile1.IsReadOnly = true;
                        System.Diagnostics.Process.Start("notepad.exe", @"FileContent.txt");

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Author Closing Comment

by:mikesExpertExchange
ID: 40657107
Thank you.
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