Progress when assigning datasource to XtraTreeList - treeview

Question

I have a XtraTreeList and I assign a huge datasource (with millions of items) to it
xtraTree.TreeViewData = dataSource;
This operation takes 80 seconds to complete, which is totally fine given the amount of nodes.
I'd just like to display a somewhat reliable progress bar to the user, indicating how many nodes have been processed.
I have tried:
looking in the event list, but I only found PrintExportProgress
googling for the topic, hoping I would find something on the DevExpress support pages
I'm using the WinForms variant, version 15.2 if that matters.
This is not about displaying progress while I build the datasource. There are 2 steps:
build the datasource (read from file) - this also takes 60 seconds, but I do that myself and I have no problem here
assign the datasource to the XtraTreeList - works, but I don't get progress information and it needs to be done on the UI thread, which is blocking
This is also not about cross-thread updating of the progress bar. I know how to do that.

Answer 1

Hey I did the same thing in a project that I built using WinForms ... except I only had 4500 items - these items were files that I had to extract data from. What I did is at each file that I processed (at the bottom of my foreach loop) I called a method to update my progress bar on my form:
Form1.UpdateProgressbar();
Inside my Form1.cs, I did this:
public void UpdateProgressbar()
{
progressBar2.Increment(1);
label7.Text = "Processed: " + Convert.ToString(progressBar2.Value) + " out of " + Globals.totalartistcount + " Artists";
label8.Text = "Processed: " + Globals.songcounter + " Songs. Processing: " + Globals.artist;
label9.Text = "Total Number of Songs to process: " + Globals.totalsongcount;
progressBar2.Update();
Application.DoEvents();
}
If I remember right the
Application.DoEvents();
was critical to actually see the progress bar move and the labels update their text. I initialized my progress bar this way:
/* ------ progress bar ------------------------------------------ */
public void InitializeProgressBar(DirectoryInfo di)
{
int songcount = 0;
int artistcount = 0;
int index = 0;
//Get Total number of folders
foreach (var sf in di.GetDirectories())
{
//find index of artist to process
//this is just an array of artist names and if true or false to process
for (int i = 0; i <= Globals.artists.GetUpperBound(0); i++)
{
if (sf.Name == Globals.artists[i, 0])
{
index = i;
break;
}
}
if (Globals.artists[index, 1] != "false")
{
// Get a total number of files to process (MAX)
foreach (var fi in sf.GetFiles("*.mp3"))
{
songcount++;
}
artistcount++;
}
}
Globals.totalartistcount = artistcount;
Globals.totalsongcount = songcount;
progressBar2.Minimum = 0;
progressBar2.Maximum = artistcount - 1;
progressBar2.Value = 0;
Application.DoEvents();
}
There, I hope that helps.