Windows Forms FAQ resources

22. Windows Forms RichTextBox

1) Set the AllowDrop property to true
2) Add handlers for both the DragEnter and DragDrop event

this.richTextBox1.DragEnter += new System.Windows.Forms.DragEventHandler(this.richTextBox1_DragEnter);

this.richTextBox1.DragDrop += new System.Windows.Forms.DragEventHandler(this.richTextBox1_DragEnter);

....

private void richTextBox1_DragEnter(object sender,

System.Windows.Forms.DragEventArgs e)

{

if (((DragEventArgs)e).Data.GetDataPresent(DataFormats.Text))

((DragEventArgs)e).Effect = DragDropEffects.Copy;

else

((DragEventArgs)e).Effect = DragDropEffects.None;

}

private void richTextBox1_DragDrop(object sender, DragEventArgs e)

{

// Loads the file into the control.

richTextBox1.LoadFile((String)e.Data.GetData("Text"), System.Windows.Forms.RichTextBoxStreamType.RichText);

}

Here are VB snippets.

AddHandler Me.richTextBox1.DragEnter, New System.Windows.Forms.DragEventHandler(AddressOf Me.richTextBox1_DragEnter)

AddHandler Me.richTextBox1.DragDrop, New System.Windows.Forms.DragEventHandler(AddressOf Me.richTextBox1_DragEnter)

.....

Private Sub richTextBox1_DragEnter(sender As Object, e As System.Windows.Forms.DragEventArgs)

If CType(e, DragEventArgs).Data.GetDataPresent(DataFormats.Text) Then

CType(e, DragEventArgs).Effect = DragDropEffects.Copy

Else

CType(e, DragEventArgs).Effect = DragDropEffects.None

End If

End Sub 'richTextBox1_DragEnter

Private Sub richTextBox1_DragDrop(sender As Object, e As DragEventArgs)

' Loads the file into the control.

richTextBox1.LoadFile(CType(e.Data.GetData("Text"), [String]), System.Windows.Forms.RichTextBoxStreamType.RichText)

End Sub 'richTextBox1_DragDrop