Drag and Drop Image on PictureBox in Winfoms Form

Ranjit Powar
10y
29.6k
0
0

Blog

In this blog we learn how to drag drop image file on picturebox in Winforms.

Step 1: Create new windows application in C#.

Step 2: Take picturebox control and place it on form as below.

Step 3: Set AllowDrop property of form as True.

Step 4: Write following code.

using System;

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

namespace WindowsFormsApplication1

{
public partial class Form1 : Form
{

protected bool validData;

        string path;
        protected Image image;
        protected Thread getImageThread
        public Form1()
        {
            InitializeComponent();
        }

private void Form1_DragEnter(object sender, DragEventArgs e)

        {
            string filename;
            validData = GetFilename(out filename, e);
            if (validData)
            {
                path = filename;
                getImageThread = new Thread(new ThreadStart(LoadImage));
                getImageThread.Start();
                e.Effect = DragDropEffects.Copy;
            }
            else
                e.Effect = DragDropEffects.None;
        }
        private bool GetFilename(out string filename, DragEventArgs e)
        {
            bool ret = false;
            filename = String.Empty;
            if ((e.AllowedEffect & DragDropEffects.Copy) == DragDropEffects.Copy)

            {
                Array data = ((IDataObject)e.Data).GetData("FileDrop") as Array;
                if (data != null)
                {
                    if ((data.Length == 1) && (data.GetValue(0) is String))
                    {
                        filename = ((string[])data)[0];
                        string ext = Path.GetExtension(filename).ToLower();
                        if ((ext == ".jpg") || (ext == ".png") || (ext == ".bmp"))
                       {
                            ret = true;
                        }
                    }
                }
            }
            return ret;
        }

private void Form1_DragDrop(object sender, DragEventArgs e)

        {
            if (validData)
            {
                while (getImageThread.IsAlive)
                {
                    Application.DoEvents();
                    Thread.Sleep(0);
                }
                pictureBox1.Image = image;
            }
        }

protected void LoadImage()

        {
            image = new Bitmap(path);
        }
    }
}

Step 5: Run application.

Step 6: Drag drop image file on form.

Step 7: The image in picturebox will change as below.