CODEWITHSUNDEEP
c#asynchronous
Harsha
Harsha

Reputation: 1879

How run and link AsyncBindingList to listbox

I have an application where I list all the files from the folder selected. And I have a class called FileManager which contains, AsyncBindingList which is connected to my listBox on the form. here is the code, 

public class frmWriter : Form
{

    FileManager filemanager;  
    public frmWriter()
    {
        this.listBoxFilesFolder.DataSource = fileManager.FilesFolderList;
    }

    private void btnAddFolder_Click(object sender, EventArgs e)
    {
        FolderBrowserDialog FolderDialog = new FolderBrowserDialog();
        FolderDialog.ShowNewFolderButton = false;           


        if (FolderDialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
        {
            //if I call this function in the following way, My application will not give
            //any response to user mouse click. 
            filemanager.AddFileFolder(FolderDialog.SelectedPath);


        }

    }
}

public class FileManager
{
    AsyncBindingList<string> FilesFolderList;

    public FileManager()
    {
        FilesFolderList = new AsyncBindingList<string>();
    }

    public void AddFileFolder(string FolderSelected)
    {
        string[] Files = Directory.GetFiles(FolderSelected);
        //List<string> ValidFiles = new List<string>(); 

        foreach (string file in Files)
        {

            if (ValidateFile(file))
            {
                //Do some work
            }
        }
        string[] Folders = Directory.GetDirectories(FolderSelected);
        foreach (string folder in Folders)
            GetFilesFromFolder(folder);

        FilesFolderList.Add(FolderSelected);

    }

    private bool ValidateFile(string FilePath)
    {
        //This Function takes time to validate the file
        return true;
    }
}

What is this best way to call this method: filemanager.AddFileFolder, so UI, always resposive to mouse clicks.

if you have any code or any weblinks please post.

Thank you, Harsha

Upvotes: 0

Views: 306

Answers (1)

Ritch Melton
Ritch Melton

Reputation: 11598

There are only two rules to using AsyncBindingList:

instantiate the AsyncBindingList on the UI thread update the AsyncBindingList ( via one of its Add/AddNew/Insert/Delete/Clear methods ) on the background thread. AsyncBindingList

You'll need to implement a Thread (or BackgroundWorker for the add method:

public class FileManager
{
    public AsyncBindingList<string> FilesFolderList = new AsyncBindingList<string>();
    private BackgroundWorker bw = new BackgroundWorker();
    public FileManager()
    {
        bw.DoWork += GetFiles;
    }

    public void GetFiles(string startFolder)
    {
        bw.RunWorkerAsync(startFolder);
    }

    private void GetFiles(object sender, DoWorkEventArgs e)
    {
        var startFolder = e.Argument as string;
        if (startFolder == null)
        {
            e.Cancel = true;
            return;
        }

        var files = Directory.GetFiles(startFolder);
        var validFiles = Array.Find(files, ValidateFile);
        var folders = Directory.GetDirectories(startFolder);
        var folderFiles = Array.ForEach(folders, GetFilesFromFolder);

        FilesFolderList.Add(startFolder);
    }

    private List<string> GetFilesFromFolder()
    {
        return new List<string>();            
    }

    private bool ValidateFile(string FilePath)
    {
        //This Function takes time to validate the file
        return true;
    }

Upvotes: 1

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