[C# Windows Forms] Drag Drop behaviour

[Shashi Sadasivan]

Hi all,
I have a scenario where i have to drag data from one form to another.
both contain 3rd party gridviews
and the user can select multiple rows.
Data can be dragged and dropped from any grid from either form to another one (infact there are about 6 forms, each with a grid, displaying the same data schema)

I use the mouse down event to capture all the rows selected and start the doDragDrop event for that grid
and have handled the dragDrop event too
for each of the grids.

The issue is that if i click on a grid (click and release) and then go across to the other form and click on it , the data is transferred to that grid (as if it was a drag and drop event)

I did have the queryContinueDr ag event where i captured if the left mouse button was clicked, but this obviously cancelled the evenet the moment i released the mouse.

any possible fixes to this issue?

- the other thing is that once i click once (and release) on a grid, i have to click twice to select something elese in the MDI parent! (the MDI parent is a Ribbon style form)

[CyberSoftHari]

You can use

IResourceWriter

To save data as file to specific path on mouse click (If there is a file already then read it from there and drop it in another form control on click).

ResourceSet

will read the file content.

[Shashi Sadasivan]

You can use

IResourceWriter

To save data as file to specific path on mouse click (If there is a file already then read it from there and drop it in another form control on click).

ResourceSet

will read the file content.

never wanted to save it to a file!
I dont think that would be required, as the data being dragged isint immensly huge.

[CyberSoftHari]

The only way to drag and drop is to hold the mouse click and release it in another form.

But you want it in mouse down then you have to store data somewhere, if data isn’t huge then store it in database or use a temporary public variable.

[Shashi Sadasivan]

The only way to drag and drop is to hold the mouse click and release it in another form.

But you want it in mouse down then you have to store data somewhere, if data isn’t huge then store it in database or use a temporary public variable.

Ok, I think I did not make it entirely clear.
The whole drag and drop thing works fine.
The BUG: I click on the grid (and release it) then i go to the other forms grid and click there. The drag event apparantly happens. I dont want this to happen.

I know that my mouse-down event fires the drag event, and the dragDrop event is fired the moment i click on the other grid (when the mouse is clicked and released)

My question here is on how to I go about avoiding this scenario

[CyberSoftHari]

LET ME CLEAR.....!

Did you mean...

private void ControlName_DragDrop(object sender, DragEventArgs e)
        {
                     e.Data // this wll be your Data which is draged.
 
        }

Is it correct?

[Shashi Sadasivan]

LET ME CLEAR.....!

Did you mean...

private void ControlName_DragDrop(object sender, DragEventArgs e)
        {
                     e.Data // this wll be your Data which is draged.
 
        }

Is it correct?

yes, on that event i am checking if the data being dragged is of my object ttype, and then do the drop action.

and thats how I start my drag event
these 2 event handlers are the same code pasted in them

private void ControlName_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                //creating object obj
                 ControlName.DodragDrop(obj, DragDropEffects.Move);
            }
        }

cheers

[CyberSoftHari]

Did your problem solved?

[Shashi Sadasivan]

No,
i posted what i had already.
I thought you were not clear when i posted my query in a pseudo code manner

[skrco]

Solution to your problem is: use ItemDrag event instead of MouseDown