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 the 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.