c# label not dragging:

Question

When I try and drag label into the rich text box, the icon stays as rejected. My labels are in a panel, separate from the rich text box. How can I get the text from the label to copy into the rich text box? Right now I get the circle with a line as though I hadn't set txtText.AllowDrop to true, but I did right there at the form load.

Thanks

King King · Accepted Answer · 2013-08-19 00:25:47Z

1

OK, I've found out that the RichTextBox doesn't have the standard drag-n-drop implementation. I has a property called EnableAutoDragDrop, just set this to true, it will handle everything automatically. You don't need any event registering for it except this one:

richTextBox1.EnableAutoDragDrop = true; //Just this even without AllowDrop = true
//RichTextBox doesn't even have DragOver event exposed, we have to cast it to Control to expose the base DragOver event
((Control)richTextBox1).DragOver += (s, e) => 
{
    e.Effect = DragDropEffects.Copy;
};

Without registering the DragOver event handler, you have to use (hold down/press) the Control key while doing drag-n-drop.

edited Aug 19, 2013 at 0:25

answered Aug 18, 2013 at 23:38

King King

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5 Comments

Altimus Prime Over a year ago

Thanks for the advice, but replacing my lblWord_MouseDown event with yours yielded no change.

King King Over a year ago

@AuntJamaima the default SetText("") with 1 argument set the text as Unicode format while you check for the ANSI format in the DragEnter event handler. I updated the code and it should work now.

Altimus Prime Over a year ago

I made your change with no difference in behavior in the application. I've now posted the entire code. The textbox is a rich text box. I have a different version of a very similar application that seems to work with a regular text box. Could that make a difference.

King King Over a year ago

@AuntJamaima OK, I updated the answer, that's the problem of RichTextBox.

Altimus Prime Over a year ago

Thank you. I added the call in the form load and it's works, albeit differently than a regular text box for sure. Thanks very much.

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