Search images across subdirectories

Question

I need to search for images in all subdirectories and present them in one picturebox, but the code I currently have only allows me to search in a single folder and without filtering by file types such as *jpg, *png, etc....

Follow my code below:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;

namespace _myfotospf
{
    public partial class FormFotos1 : Form
    {
        public FormFotos1()
        {
            InitializeComponent();
        }

        private void FormFotos_Load(object sender, EventArgs e)
        {
            string[] files = Directory.GetFiles(@"C:\Users\...\Imagens");
            DataTable table = new DataTable();
            table.Columns.Add("Nome do ficheiro (duplo clique para ver a miniatura)");
            for (int i = 0; i < files.Length; i++)
            {
                FileInfo file = new FileInfo(files[i]);
                table.Rows.Add(file.Name);
            }
            dataGridView1.DataSource = table;
        }

        private void dataGridView1_DoubleClick(object sender, EventArgs e)
        {
            FormFotos2 myForm = new FormFotos2();
            string imageName = dataGridView1.CurrentRow.Cells[0].Value.ToString();
            Image img;
            img = Image.FromFile(@"C:\Users\...\Imagens\" + imageName);
            myForm.pictureBox1.Image = img;
            myForm.ShowDialog();
        }

        private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)
        {

        }
    }
}

Answer 1

You can return one Ienumerable with the directories of your files. This method I am passing you will look for in the root directory and in the subdirectories from the informed path.

First parameter is the root directory you want to start searching for your files.

Second parameter is the file search pattern, in which case we are saying to fetch all files from all extensions.

Third parameter we are saying that we will search in all subdirectories from our root path.

The Where clause of Linq is for filtering the files that have the extensions we want to find, in your case you want jpg or png. If you want to insert one more extension, just add one more condition OR to the desired extent.

IEnumerable<string> arquivos = Directory.EnumerateFiles(@"C:\Imagens", "*.*", SearchOption.AllDirectories).Where(w => w.ToLower().EndsWith(".jpg") || w.ToLower().EndsWith(".png"));

Answer 2

I think this solution is quite comprehensive:

// se pretender ter várias pastas
List<string> diretorios = new List<string>()
{
    @"C:\Pasta1",
    @"C:\Pasta2",
    @"C:\Pasta3"
};

// se pretender pesquisar várias extensões
// é necessário ter um ponto antes da extensão
List<string> extensoes = new List<string>()
{
    ".jpg",
    ".bmp",
    ".png",
    ".tiff",
    ".gif"
};

private void FormFotos_Load(object sender, EventArgs e)
{
    DataTable table = new DataTable();

    table.Columns.Add("Nome do ficheiro (duplo clique para ver a miniatura)");

    foreach (string diretorio in diretorios)
    {
        var ficheiros = Directory.EnumerateFiles(diretorio, "*", SearchOption.AllDirectories).
            Where(r => extensoes.Contains(Path.GetExtension(r.ToLower())));

        foreach (var ficheiro in ficheiros)
            table.Rows.Add(Path.GetFileName(ficheiro));
    }

    dataGridView1.DataSource = table;
}