Argument exception error, the path is not of legal form

Question

1.00/5 (1 vote)

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I get an argument exception(error image) when I run this piece of code

C#

DirectoryInfo directoryInfo = new DirectoryInfo(path);

This is the code that gets path

C#

private void openFolderToolStripButton_Click(object sender, EventArgs e)
{
    FolderBrowserDialog obd = new FolderBrowserDialog();
    if (obd.ShowDialog() == DialogResult.OK)
    {
        path = obd.SelectedPath;
        Console.WriteLine("path is found");
        Console.WriteLine(path.ToString());

    }
}

What I have tried:

It works fine with a predefined path e.g.

C#

DirectoryInfo directoryInfo = new DirectoryInfo(@"C:\Users\rohit\Desktop\all\DS4Windows");

What should I do, I am a bit confused why this is a problem

Posted 21-Feb-17 1:01am

Rohit Pai (rodude123)

Updated 21-Feb-17 1:12am

v2

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Comments

Karthik_Mahalingam 21-Feb-17 7:06am

is the path null/empty on load?

Ehsan Sajjad 21-Feb-17 7:48am

what is value in the path variable at that time when exception is coming ?

2 solutions

Solution 1

Hi,

from the provided screenshot it seems you're trying to do this in Form1_Load. Are you sure you have a valid path at this point? If it's your only form and you didn't send the path from some other form, this will probably be the issue. Debug your code to see what really is in the path variable in the moment you creating DirectoryInfo.

Hope this helps.

Posted 21-Feb-17 1:08am

jimmson

Comments

Rohit Pai (rodude123) 21-Feb-17 8:30am

The path at the beginning is always null because the path is not chosen yet from the folder browser dialog, I am trying to create a folder browser for my code editor

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Karthik_Mahalingam · Accepted Answer · 2017-02-21T01:12:00

Solution 2

Since the path is empty/null on page load, it will result in argument exception, ( based on info from screenshot)

FolderBrowserDialog obd = new FolderBrowserDialog();
            if (obd.ShowDialog() == DialogResult.OK)
            {
               string path = obd.SelectedPath; 
                DirectoryInfo directoryInfo = new DirectoryInfo(path);
                // cut the code from page load and paste it over here.

            }

Posted 21-Feb-17 1:12am

Karthik_Mahalingam

Updated 21-Feb-17 1:13am

v2

Comments

Rohit Pai (rodude123) 21-Feb-17 8:33am

This works thanks

Karthik_Mahalingam 21-Feb-17 8:35am

Welcome RP

Rohit Pai (rodude123) 21-Feb-17 8:37am

I didn't think of that. Is there a way to make a tree view have buttons, I was wondering because I am making a file browser for code editor

Karthik_Mahalingam 21-Feb-17 8:42am

Hmm sometimes happens

Rohit Pai (rodude123) 21-Feb-17 8:43am

yea

Karthik_Mahalingam 21-Feb-17 8:45am

Break point is your Friend