更新listview时的Stackoverflow

Question

我目前正在处理一段代码，它循环遍历给定路径中的所有文件，包括子目录，并计算该路径中具有特定文件扩展名的文件数。我的代码部分似乎工作正常。

问题来自于我决定添加一些额外的功能，在程序计算扩展时提供更新文本，因为有时可能需要一点时间来完成搜索所有子目录。

所以我尝试添加一些东西，这些东西会在给定的时间间隔内更改listview的给定行中的文本，以表示类似“处理”的内容。 “处理......”处理......“处理......”等，每隔一段时间更改一次......

但是，当我添加listview更新功能时，我得到一个stackoverflow异常。有没有人介意帮助初学者试图弄明白这件事？

此外，在stackoverflow异常抛出之前，我没有在listview中获得预期的结果;我希望看到更新文本。相反，所有列和行都会消失为白色。

以下是一些代码：

class FolderSelectionClass
{
    private FormMain formMain;              

    public FolderSelectionClass(FormMain myFormMain)
    {
        formMain = myFormMain;                 

    }


    public void GetPictureCount(string selectedPath)
    {
        try
        {
            int count = 0;

            //for each file in the path, is its file extension in our settings?
            //If so, then add it to the count

            foreach (ListViewItem listViewItem in formMain.ListView_Folders.Items)
            {
                if (selectedPath == listViewItem.SubItems[1].Text)//[1] = folder path
                {
                    Stopwatch myStopwatch = new Stopwatch();
                    //If subdirectories incuded    
                    if (listViewItem.Checked == true)
                    {                                                
                        CountPicturesInPath(selectedPath, true, ref count, listViewItem.Index, myStopwatch);

                    }
                    else//not checked..subdirectories not included
                    {
                        CountPicturesInPath(selectedPath, false, ref count,listViewItem.Index, myStopwatch);
                    }
                }                                        
            }


            //update listview 
            formMain.ListView_Folders.BeginUpdate();

            foreach (ListViewItem item in formMain.ListView_Folders.Items)
            {
                //find the item in the listview that is being updated
                if (selectedPath == item.SubItems[1].Text)//[1] = folder path
                {
                    item.SubItems[2].Text = count.ToString();

                    break;
                }
            }
            formMain.ListView_Folders.EndUpdate();
            formMain.ListView_Folders.Refresh();


        }
        catch (Exception e)
        {
            MessageBox.Show(e.Message + "  (in GetPictureCount())");
        }

    }


    private void CountPicturesInPath(string path,bool includeSubs, ref int pictureCount, int indexOfListViewItem, Stopwatch stopWatch)
    {               

        try
        {
            //start listview processing animation                             
            CheckTime(indexOfListViewItem,stopWatch);


            foreach (string filePath in Directory.EnumerateFiles(path, "*.*", SearchOption.TopDirectoryOnly))
            {
                try
                {
                    FileInfo file = new FileInfo(filePath);

                    //for each item listed in file extension settings, check it against
                    //this file extension.  If they match, add it to the count
                    foreach (string s in Properties.Settings.Default.FileExtensions)
                    {
                        if (s == file.Extension)
                        {
                            pictureCount++;
                            break;
                        }
                    }                       

                }
                catch (Exception e)
                {
                    MessageBox.Show(e.Message + "  (in CountPicturesInPath())");
                }
            }



            //Now that we have counted the pictures in the current folder, if we are
            //including subfolders, then we need to move to the next valid folder 
            //and count the pictures there.
            if (includeSubs == true)
            {
                if ((File.GetAttributes(path) & FileAttributes.ReparsePoint)
                    != FileAttributes.ReparsePoint)
                {
                    foreach (string folder in Directory.EnumerateDirectories(path))
                    {
                        CountPicturesInPath(folder, includeSubs, ref pictureCount, indexOfListViewItem, stopWatch);
                    }
                }
            }
        }
        catch (UnauthorizedAccessException) { }



    }

    private void CheckTime(int indexOfListViewItem, Stopwatch myStopwatch)
    {
        if (!myStopwatch.IsRunning)
        {
            myStopwatch.Start();
            ProcessingPictureCount_Animation(indexOfListViewItem);
        }

        if (myStopwatch.ElapsedMilliseconds >= 2000)
        {
            ProcessingPictureCount_Animation(indexOfListViewItem);
            myStopwatch.Reset();
        }
    }


    private void ProcessingPictureCount_Animation(int indexOfListViewItem)
    {
        //the idea here is to add a Processing... animation in the count column
        //while the count is going on, so that the user knows that the program is
        //still working.  

        ListViewItem item = formMain.ListView_Folders.Items[indexOfListViewItem];
        string myText = item.SubItems[2].Text;

        if (myText == "0")
        {
            item.SubItems[2].Text = "Processing.";
        }
        else if (myText == "Processing.")
        {
            item.SubItems[2].Text = "Processing..";
        }
        else if (myText == "Processing..")
        {
            item.SubItems[2].Text = "Processing...";
        }
        else if (myText == "Processing...")
        {
            item.SubItems[2].Text = "Processing....";
        }
        else if (myText == "Processing....")
        {
            item.SubItems[2].Text = "Processing.....";
        }
        else if (myText == "Processing.....")
        {
            item.SubItems[2].Text = "Processing.";
        }

        formMain.ListView_Folders.BeginUpdate();
        formMain.ListView_Folders.Items[indexOfListViewItem] = item;
        formMain.ListView_Folders.EndUpdate();
        formMain.ListView_Folders.Refresh();

    }
}