How Can I Filter Files In Folderbrowserdialog?

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C#

I try to fill a listview with imagefiles by an folderBrowserDialog. Who know a fast way to do this?

Thank you :)

Posted 12-Mar-15 2:31am

Karsten Klinger

Updated 12-Mar-15 4:24am

Sinisa Hajnal

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Sinisa Hajnal 12-Mar-15 10:24am

Easily found online.

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Mario Z · Accepted Answer · 2015-03-12T04:57:00

First I'm guessing you want to fill out the System.Windows.Forms.ListView, right?
Second I'm guessing you want to fill it with image files located inside a folder which is selected with FolderBrowserDialog, right?
In the future you really should specify your issues better...

Nevertheless what you need to do is fill the ListView's LargeImageList or a SmallImageList (depending on what ListView's View you are going to use) with the Image objects created from image files.
So something like the following:

C#

if (this.folderBrowserDialog1.ShowDialog() == DialogResult.OK)
{
    this.listView1.View = View.LargeIcon;
    this.listView1.LargeImageList = new ImageList() { ImageSize = new Size(64, 64) };

    var imageFiles = from file in Directory.EnumerateFiles(this.folderBrowserDialog1.SelectedPath)
                    let extension = Path.GetExtension(file)
                    // Add more image extensions if needed ... 
                    where extension.Equals(".jpg") || extension.Equals(".png")
                    select file;

    int imageIndex = 0;
    foreach (string imageFile in imageFiles)
    {
        this.listView1.LargeImageList.Images.Add(Image.FromFile(imageFile));
        this.listView1.Items.Add(null, imageIndex++);
    }
}

Mario Z · Accepted Answer · 2015-03-13T01:06:00

I see now, so you want to Drag & Drop the images onto the ListView control, well that makes sense.
For this you need to enable Drag & Drop feature in your application, here is a short overview of Drag-and-Drop Functionality in Windows Forms.
And here is an example how you can do this:

C#

// I moved this outside.
private int imageIndex = 0;

public Form1()
{
    InitializeComponent();

    this.listView1.AllowDrop = true;

    this.listView1.DragEnter += (sender, e) =>
    {
        if (e.Data.GetDataPresent(DataFormats.FileDrop))
            e.Effect = DragDropEffects.Copy;
    };

    this.listView1.DragDrop += (sender, e) =>
    {
        string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);

        // You can notice that the following lines are repetition which I also used in above sample code.
        // So you can tweak a bit your code so that you don't repeat yourself.
        var imageFiles = from file in files
                            let extension = Path.GetExtension(file)
                            where extension.Equals(".jpg") || extension.Equals(".png")
                            select file;

        foreach (string imageFile in imageFiles)
        {
            this.listView1.LargeImageList.Images.Add(Image.FromFile(imageFile));
            this.listView1.Items.Add(null, this.imageIndex++);
        }
    };
}

How Can I Filter Files In Folderbrowserdialog?

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