Question

how do i let UIthread to execute a command when im in some thread
the code below is called by a thread but the line i want to run in UIthread .. doesn’t work if i called it like that ..
the form lag a little and the process fan got fast like it’s in infinity loop.. then it gives me an error “stackoverflowexception”

my application is a file manager .. (copy, cut, paste, new folder..etc) .. and dirRecursive(string path) .. shows me the files and folders in a listView with its icons so every time i do something like (new folder or paste) i have to call dirRecursive to update the listView

note:

it works excellent before i tried to execute PasteFromCopy with a thread ..

it works excellent when i remove the dirRecursive(..) line from the paste method .. but i need to update listview automatically after the paste is done .. that why i have to call it from PasteFromCopy but using UIThread

if i used UIThread to PASTE then the form will lag when a file is being copyied .. you know

please help 🙂 thanks in advance

private void PasteFromCopy(object dest)
    {
        foreach (ListViewItem item in copiedItems)
        {
            string _dest = (string)dest;
            string itemName = item.Text;
            string itemPath = item.ToolTipText;
            string itemDest = Path.Combine(_dest, itemName);
            if (IsFolder(itemPath))
            {
                if (Directory.Exists(itemDest))
                {
                    if (MessageBox.Show(itemName + " is already exists .. Do you want to overwrite it and its all contents?"
                        , "Overwrite", MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk) == DialogResult.OK)
                    {
                        CopyDirectory(itemPath, itemDest, true);
                    }
                }
                else
                    CopyDirectory(itemPath, itemDest, false);
            }
            else
            {
                if (File.Exists(itemDest))
                {
                    if (MessageBox.Show(itemName + " is already exists .. Do you want to overwrite it?"
                    , "Overwrite", MessageBoxButtons.OKCancel, MessageBoxIcon.Asterisk) == DialogResult.OK)
                    {
                        InfoLabel("Copying " + itemName + " ...");
                        File.Copy(itemPath, itemDest, true);
                    }
                }
                else
                {
                    InfoLabel("Copying " + itemName + " ...");
                    File.Copy(itemPath, itemDest, false);
                }
            }
            InfoLabel("Paste done.");

            dirRecursive(currAddress);   // here is line i need to execute from UIthread
        }
    }

Answer 1

try replacing this line

dirRecursive(currAddress);

with

if (InvokeRequired)
{
    Action a = ()=>dirRecursive(currAddress);
    Invoke(a);
}

This is assuming you’re using WinForms and not WPF, you haven’t specified. Also ‘InvokeRequired’ and ‘Invoke’ are both members of a System.Windows.Forms.Control so your PasteFromCopy would need to be a method on your form.