#708 – Dragging a File Into a WPF Application

You can use drag-and-drop in WPF to allow a file to be dragged into your application, using the DataFormats.FileDrop format.

You first specify that you only support the FileDrop format.

        private void Window_DragEnter(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effects = DragDropEffects.Copy;
            else
                e.Effects = DragDropEffects.None;

            e.Handled = true;
        }

        private void Window_DragOver(object sender, DragEventArgs e)
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effects = DragDropEffects.Copy;
            else
                e.Effects = DragDropEffects.None;

            e.Handled = true;
        }

When you call GetData in your Drop event handler, you get back a list of filenames being dropped.  Below is an example where we set a Label to show the filename and then set the contents of a TextBlock to show the text from the file.

        private void Window_Drop(object sender, DragEventArgs e)
        {
            string[] filenames = (string[])e.Data.GetData(DataFormats.FileDrop);

            lblFilename.Content = filenames[0];

            txtContent.Text = File.ReadAllText(filenames[0]);
        }

708-001

 

708-002

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

One Response to #708 – Dragging a File Into a WPF Application

  1. Pingback: Dew Drop – December 10, 2012 (#1,459) | Alvin Ashcraft's Morning Dew

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