This is a way to get the data in all available formats from a Drag&Drop operation.
A Browser source works fine (I tested Edge, IE 11 and FireFox).
The Source formats are usually passed as strings or as a MemoryStream.
You can further adapt it to your context.
UPDATE:
Rebuilt the main Class object. It's now more compact and handles more details. Also, I've added a sample VS sample WinForms Form to test its results. It's a standard Form that can be included in a VS Project.
Google Drive: Drag & Drop sample Form
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
private FileDropResults DD_Results;
public class FileDropResults
{
public enum DataFormat : int
{
MemoryStream = 0,
Text,
UnicodeText,
Html,
Bitmap,
ImageBits,
}
public FileDropResults() { this.Contents = new List<DropContent>(); }
public List<DropContent> Contents { get; set; }
public class DropContent
{
public object Content { get; set; }
public string Result { get; set; }
public DataFormat Format { get; set; }
public string DataFormatName { get; set; }
public List<Bitmap> Images { get; set; }
public List<string> HttpSourceImages { get; set; }
}
}
private void TextBox1_DragDrop(object sender, DragEventArgs e)
{
GetDataFormats(e.Data);
}
private void TextBox1_DragEnter(object sender, DragEventArgs e)
{
e.Effect = DragDropEffects.Copy;
}
private void GetDataFormats(IDataObject Data)
{
DD_Results = new FileDropResults();
List<string> _formats = Data.GetFormats(false).ToList<string>();
foreach (string _format in _formats)
{
FileDropResults.DropContent CurrentContents = new FileDropResults.DropContent()
{ DataFormatName = _format };
switch (_format)
{
case ("FileGroupDescriptor"):
case ("FileGroupDescriptorW"):
case ("DragContext"):
case ("UntrustedDragDrop"):
break;
case ("DragImageBits"):
CurrentContents.Content = (MemoryStream)Data.GetData(_format, true);
CurrentContents.Format = FileDropResults.DataFormat.ImageBits;
break;
case ("FileDrop"):
CurrentContents.Content = null;
CurrentContents.Format = FileDropResults.DataFormat.Bitmap;
CurrentContents.Images = new List<Bitmap>();
CurrentContents.Images.AddRange(
((string[])Data.GetData(DataFormats.FileDrop, true))
.ToList()
.Select(img => Bitmap.FromFile(img))
.Cast<Bitmap>().ToArray());
break;
case ("HTML Format"):
CurrentContents.Format = FileDropResults.DataFormat.Html;
CurrentContents.Content = Data.GetData(DataFormats.Html, true);
int HtmlContentInit = CurrentContents.Content.ToString().IndexOf("<html>", StringComparison.InvariantCultureIgnoreCase);
if (HtmlContentInit > 0)
CurrentContents.Content = CurrentContents.Content.ToString().Substring(HtmlContentInit);
CurrentContents.HttpSourceImages = DD_GetHtmlImages(CurrentContents.Content.ToString());
break;
case ("UnicodeText"):
CurrentContents.Format = FileDropResults.DataFormat.UnicodeText;
CurrentContents.Content = Data.GetData(DataFormats.UnicodeText, true);
break;
case ("Text"):
CurrentContents.Format = FileDropResults.DataFormat.Text;
CurrentContents.Content = Data.GetData(DataFormats.Text, true);
break;
default:
CurrentContents.Format = FileDropResults.DataFormat.MemoryStream;
CurrentContents.Content = Data.GetData(_format, true);
break;
}
if (CurrentContents.Content != null)
{
if (CurrentContents.Content.GetType() == typeof(MemoryStream))
{
using (MemoryStream _memStream = new MemoryStream())
{
((MemoryStream)CurrentContents.Content).CopyTo(_memStream);
_memStream.Position = 0;
CurrentContents.Result = Encoding.Unicode.GetString(_memStream.ToArray());
}
}
else
{
if (CurrentContents.Content.GetType() == typeof(String))
CurrentContents.Result = CurrentContents.Content.ToString();
}
}
DD_Results.Contents.Add(CurrentContents);
}
}
public List<string> DD_GetHtmlImages(string HtmlSource)
{
MatchCollection matches = Regex.Matches(HtmlSource, @"<img[^>]+src=""([^""]*)""",
RegexOptions.CultureInvariant | RegexOptions.IgnoreCase);
return (matches.Count > 0)
? matches.Cast<Match>()
.Select(x => x.Groups[1]
.ToString()).ToList()
: null;
}
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