How do I use FileOpen (VB.NET) in C#?

Question

So, I'm working on converting this code from VB.NET to C#:

    Public Class Form1
    Const filesplit As String = "|split|"
    Dim stub, opt() As String

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        On Error Resume Next
        FileOpen(1, Application.ExecutablePath, OpenMode.Binary, OpenAccess.Read, OpenShare.Shared)
        stub = Space(LOF(1))
        FileGet(1, stub)
        FileClose(1)
        opt = Split(stub, filesplit)

    End Sub
End Class

I've used a series of online converters, and they don't really work for me.

How do I do it? I'm trying to understand VB.NET source code so I can use it in.

What's FileOpen()? (And Space()? And LOF()? And FileGet()? And FileClose()? And Split()?) If this is VB .NET then you have some helper functions that you either need to examine and implement or move to a separate assembly and reference them as-is. Either way, all of the file operations you would need are in the System.IO namespace. — David
– David, Commented Sep 12, 2014 at 12:08
@David FileOpen/Space/LOF etc. are all standard functions of VB.NET (for backward compatibility with VB6; and yes, even the On Error statement still works in VB.NET). — sloth
– sloth, Commented Sep 12, 2014 at 12:30
This must be VB.NET code as Application.Executable path is not in VB6. Looks like it has been ported from VB6 and blindly copied and pasted. — Matt Wilko
– Matt Wilko, Commented Sep 12, 2014 at 12:43

Matt Wilko · Accepted Answer · 2014-09-12 14:51:19Z

2

Those methods are in the Microsoft.VisualBasic Namespace.

So you could just add a reference to that in your project and then use virtually the exact same code with a small amount of extra qualification on the methods used:

using Microsoft.VisualBasic; //add this statement

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        string filesplit = "|split|";
        string stub;
        string[] opt;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            FileSystem.FileOpen(1, Application.ExecutablePath, OpenMode.Binary, OpenAccess.Read, OpenShare.Shared);
            stub = Strings.Space(Convert.ToInt32(FileSystem.LOF(1)));
            FileSystem.FileGet(1, ref stub);
            FileSystem.FileClose(1);
            opt = Strings.Split(stub, filesplit);
        }
    }
}

However you should really look into using the File.xxx methods in the System.IO namespace in both your VB.NET and C# code going forward, but this will get it working for you.

edited Sep 12, 2014 at 14:51

answered Sep 12, 2014 at 12:31

Matt Wilko

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3 Comments

rskar Over a year ago

However, since this is about a translation to C#, it would be smarter to (manually) convert to C# equivalents.

Matt Wilko Over a year ago

@rskar - I don't disagree with you, but it would have been smarter to translate this to VB.NET code that didn't require the VisualBasic namespace in the first place.

QaSe21 Over a year ago

thank you my brother and you are the best answer, thank you to any one try to help me thank you

David Pilkington · Accepted Answer · 2014-09-12 12:04:56Z

1

Use File.Open. That should get you what you want.

answered Sep 12, 2014 at 12:04

David Pilkington

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Comments

reckface · Accepted Answer · 2014-09-12 12:24:13Z

1

Your VB code is essentially doing this:

// The using clause ensures the StreamReader is properly disposed after the closing block.
using (StreamReader sr = File.OpenText(Application.ExecutablePath))
{
    stub = sr.ReadToEnd();
    opt = stub.Split(filesplit).ToArray();
}

This assumes filesplit is a char, string or something like Environment.NewLine

answered Sep 12, 2014 at 12:24

reckface

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Comments

Margus · Accepted Answer · 2014-09-12 12:15:58Z

0

Basically you would use :

Dim content = File.ReadAllText("c:\temp\MyTest.txt")

However it would be more correct to use:

Dim path As String = "c:\temp\MyTest.txt"
If File.Exists(path) Then
    Dim content = File.ReadAllText(path)
    Rem do something with content
End If

answered Sep 12, 2014 at 12:15

Margus

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