How do I populate a listbox with the names of images within a folder without the extensions?

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This my first post so I am not sure about the format that I need to post it, but the problem that am trying to figure out is how I can populate a listbox with the names of the images that I have in a folder within my Visual Studio Project.

C#

protected void Page_Load(object sender, EventArgs e)
       {

           if (!IsPostBack)
           {
               for (int i = 1; i < 8; i++)
               {
                   ListBox1.Items.Add(System.IO.Path.GetFileNameWithoutExtension(""));
               }
           }


       }

Basically, I have 7 images in a folder(within my actual visual studio project) and I want the for loop to populate the listbox with the names of the images, but without the extension. I can't seem to figure out how to get the directory to work. If anyone could help me, I would greatly appreciate it. I am having trouble with this.

After this, I want to use an 'if' statement to set the image displayed based on which item the user clicks on in the listbox, if that makes sense. I do not know the code for if the item = a certain item, I can display an image based on what they select.

I probably worded this really bad, but it's the issue I am currently experiencing, any help would be greatly appreciated, thank you.

Posted 14-Mar-15 17:48pm

Derek Montgomery

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Homero Rivera · Answer 1 · 2015-03-14T17:59:00

Solution 1

To remove the extension use substring and lastindexof

C#

protected void Page_Load(object sender, EventArgs e)
       {

           if (!IsPostBack)
           {

              String Path = Server.MapPath("/images/");
              String[] FileNames = Directory.GetFiles(Path);


              foreach(string file in FileNames)
              {
                   ListBox1.Items.Add(file.Substring(
                                           0,
                                           System.IO.Path.LastIndexOf(".")
                                           )

                                 );
              }
           }


       }

Posted 14-Mar-15 17:59pm

Homero Rivera

Updated 14-Mar-15 18:48pm

v2

Comments

Derek Montgomery 15-Mar-15 0:07am

Thank you for the fast response, but I am getting an error that substring and lastindexof are not an instance of system.IO path?

also how would I check to see what item the user selects? Like to use in an 'if' statement? If user selects this item, I can display certain image?

Homero Rivera 15-Mar-15 0:13am

You're right. Where's the string of your filname or filepath?

Derek Montgomery 15-Mar-15 0:19am

That was part of my original question, I am having trouble figuring out what the path should be. I have a folder within my Visual Studio C# projects with images in it called 'images', what would the path for that be? Sorry if this is a stupid question, but I am struggling with this.

Homero Rivera 15-Mar-15 0:24am

There are no stupid questions, but stupids who won't ask. Is this a Web project or a desktop app? Can you give a filepath example?

Derek Montgomery 15-Mar-15 0:30am

This is a web project. I believe this is he current file path: C:\Users\Derek\Desktop\lab5-Montgomery\lab5-Montgomery\images

I would obviously want everything after the desktop, but nothing before. Is that what you mean?

Homero Rivera 15-Mar-15 0:48am

Try new anser

Derek Montgomery 15-Mar-15 0:58am

I am still getting an lastindex of not an instance of System.IO.Path, and you did not include the for loop. I have to have to use a for loop to populate the listbox with the images for that path I already posted? Any help? and thank you for the help so far!

George Jonsson · Answer 2 · 2015-03-14T19:35:00

To get the files in the directory, use a modified version of Solution1.

Create a class that inherits from System.IO.FileSystemInfo and override the required methods. (Unfortunately FileInfo is sealed so you cannot inherit from that class.)
By overriding ToString, you can show what ever value in the list box.

C#

public class MyFileInfo : System.IO.FileSystemInfo
{
    public MyFileInfo(string fileName)
        : base()
    {
        this.FullPath = fileName;
    }

    public override string ToString()
    {
        return System.IO.Path.GetFileNameWithoutExtension(this.Name);
    }

    public override bool Exists
    {
        get { return System.IO.File.Exists(this.FullName); }
    }

    public override void Delete()
    {
        System.IO.File.Delete(this.FullName);
    }

    public override string Name
    {
        get { return System.IO.Path.GetFileName(this.FullName); }
    }
}

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string Path = Server.MapPath("/images/");
        foreach (string fileName in Directory.GetFiles(Path))
        {
            // Add a new instance of MyFileInfo for each file.
            ListBox1.Items.Add(new MyFileInfo(fileName));
        }
    }
}

[UPDATE] For-loop variant upon request

C#

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string Path = Server.MapPath("/images/");
        string[] fileNames = Directory.GetFiles(Path);
        for (int i=0; i < fileNames.Length; i++)
        {
            // Add a new instance of MyFileInfo for each file.
            ListBox1.Items.Add(new MyFileInfo(fileNames[i]));
        }
    }
}

For showing the image when an item is selected in the ListBox, you can use the event

C#

private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    MyFileInfo mfi = (listBox1.SelectedItem as MyFileInfo);
    if (mfi != null)
    {
        Image img = Image.FromFile(mfi.FullName);
        // Show your image
    }
}

This solution might be a bit of an overkill, but it has the benefit of keeping track of your files full path and you can show what ever value in your list box row.