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Drag and drop a file in C# - easy.
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 07 Aug 2011

Drag and drop a file in C# - easy.

 







 

To work with files in Visual Studio there are several controls, OpenFile Dialog, etc. But it may be a bit slow moving through file system to desired folder and file. And in case if you have already open necessary folder, you can drag and drop file to your application within one second.

To implement such a feature, you will need to change just one setting and write few lines of code.

Usually text boxes are served for such purposes. So in Text Box property AllowDrop change it to True (default setting is False). After that, add two events to your text box:

DragEnter event and DragDrop event. The code should be as follows:

 

private void txtThumbFile_DragEnter(object sender, DragEventArgs e)
{
    // Make sure that user actually dropping files (not text or anything else)
    if (e.Data.GetDataPresent(DataFormats.FileDrop, false) == true)
    {
        // Allow to continue, otherwise without this, the cursor shows a "NO" symbol
        e.Effect = DragDropEffects.All;
    }
 }

 

private void txtThumbFile_DragDrop(object sender, DragEventArgs e)

{

    string[] files = (string[])e.Data.GetData(DataFormats.FileDrop);

    this.txtThumbFile.Text = files[0];

}

 

And now you have full path to the file in your text box. So you can open file, attach to email message, etc. depending of your program.

 

 


















Move file to the text box.




Cursor changed, showing that control (Text Box) can accept the data.




Drop the file, it shows the full path to the file.


  
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      Comments
             
 

15.04.2012    Vera

A smpile and intelligent point, well made. Thanks!

              
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 Tags: C#, Code, SoftFern Tutorials, SoftFern free Tutorials and Article, SoftFern Windows and other Operatin, SoftFern Programming Tutorials, Drag and drop a file, OpenFile Dialog, drag and drop, DragEnter, DragDrop, event, file, text box
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