How to Drag and Drop node from treeview to Datagrid

[thomsonsv]

Can any help me How to Drag and Drop node from treeview to Datagrid using c#

[cloud255]

So i think what you want to do is represent the data shown in the node in a datagrd.

The first step would be to determine which node was clicked, then using an id, the entire object represented by the node or just the node text (a string) add that value to the datagrid.

perhaps if you had some code with a specific problem we could provide a more precise solution.

[thomsonsv]

So i think what you want to do is represent the data shown in the node in a datagrd.

The first step would be to determine which node was clicked, then using an id, the entire object represented by the node or just the node text (a string) add that value to the datagrid.

perhaps if you had some code with a specific problem we could provide a more precise solution.

Hi Thanks for the reply.If you could help me a with a sample C# code to Drag and Drop node from treeview to Datagrid It'll be a great help...

Thanks in advance ...

[cloud255]

Hi Thanks for the reply.If you could help me a with a sample C# code to Drag and Drop node from treeview to Datagrid It'll be a great help...

Thanks in advance ...

I am more than willing to try and find an error in YOUR code and to help you fix it, try something first.

[thomsonsv]

I am more than willing to try and find an error in YOUR code and to help you fix it, try something first.

Hi,

I tried with the follwong code :

1.created treeview control named treeView1
2.created event handler ItemDrag

3.Created datagrid named dataGridView1
4.Made it allow drop = true
5.created event handlers DragEnter & DragDrop

Eventhough I tried with a piece of code for the event DragDrop it's not working .It'll be a great help if you can guide me how to proceed with DragDrop in the gridview.

 
this.dataGridView2.AllowDrop = true;
this.dataGridView1.DragEnter += new DragEventHandler(dataGridView1_DragEnter);
this.dataGridView1.DragDrop += new DragEventHandler(dataGridView1_DragDrop);
 
 
 
private void treeView_ItemDrag(object sender, System.Windows.Forms.ItemDragEventArgs e)
{
DoDragDrop(e.Item, DragDropEffects.Move);
}
 
 
 
private void dataGridView1_DragEnter(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(typeof(DataGridViewRow)))
{
e.Effect = DragDropEffects.Copy;
}
}
 
 
 
private void dataGridView1_DragDrop(object sender, DragEventArgs e)
{
DataGridViewRow row = e.Data.GetData(typeof(DataGridViewRow))
as DataGridViewRow;
if (row != null)
{
DataGridViewRow newrow = row.Clone() as DataGridViewRow;
for (int i = 0; i < newrow.Cells.Count; i++)
{
newrow.Cells[i].Value = row.Cells[i].Value;
}
this.dataGridView1.Rows.Add(newrow);
 
}
}
 

[cloud255]

Hey there,

this is real nice problem,

I tried your code, it seems to me that windows doesn't want you dragging a node to a datagrid. I think this problem comes from the DragDropEffects value.

I have a work around that i think will be able to do what you want, the only problem is that the mouse cursor does not change to reflect that you are dragging, you will have to manually do some cursor setting. Anyway here does:

Create a public boolean (dragging) and a property of type object (row) with a private get and a private set.

intialize dragging to false in the decleration.

private void treeView1_ItemDrag(object sender, ItemDragEventArgs e)
        {
            //DoDragDrop(treeView1.SelectedNode.Name, DragDropEffects.Copy); // i believe this is where the problem comes from
 
           dragging = true;
            row = new object();
            treeView1.SelectedNode = (TreeNode) e.Item;//dragging doesn't automatically change the selected index
            row = treeView1.SelectedNode.Name;//or whatever value you need from the node
 
           //here you could set the cursor to something else to reflect that you are dragging
        }
 
 
 
private void dataGridView1_MouseUp(object sender, MouseEventArgs e)
        {
 
 if (dragging)
            {
                 dataGridView1.Rows.Add(row);//you could some formatting here to get the right details into the right column
                dragging = false;
 
                //set your cursor back to the deafault
            }
}

I hope this helps you.

the datagrid doesn't need to accept drop now and you need only two event handlers

good luck

[thomsonsv]

Hi Cloud ,
Thanks for the valuable reply .... I didn't understand the part "Create a public boolean (dragging) and a property of type object (row) with a private get and a private set.intialize dragging to false in the decleration."
Can u please send that piece of code ....

Thanks in Advance

[cloud255]

Hey,

happy to help, here you go:

public partial class Form1 : Form
    {
       //these declerations need to happen inside of the class but outside of any methods in the class
 
       private object _row;
 
       public object row //this is a property decleration
       {
           private get{ return this._row; }
           private set{ this._row = value; }
       }
 
       public bool dragging = false; //this is your global boolean

note i did not include a closing bracket for the class as all the other code goes under this.

good luck

[thomsonsv]

Hey,

happy to help, here you go:

public partial class Form1 : Form
    {
       //these declerations need to happen inside of the class but outside of any methods in the class
 
       private object _row;
 
       public object row //this is a property decleration
       {
           private get{ return this._row; }
           private set{ this._row = value; }
       }
 
       public bool dragging = false; //this is your global boolean

note i did not include a closing bracket for the class as all the other code goes under this.

good luck

Hi Cloud ,
Thanks a bunch for your support ...
I tried the code but got excetion like - “Cannot specify accessibility modifiers for both accessors of the property or indexer”
I removed the "private" from private set{ this._row = value; } and was able to successfully build the soln.
BUT HARD LUCK.it's stll not working ...The drag nd drop functionality to the grid view is not at all happening ...If any soultions you are able find please post...

Once again Thanks a million

[thomsonsv]

Hey dude,
I got it working !!!! Actually i re-written all the event handlers ... its working perfectly (idunno whts the real peoblem ... same code written once agains ...starts working ...) ...thaks dude for your support ....

Thanks

[cloud255]

glad to be of assistence.

Good luck with the project.