Winforms : avoid freeze application

Question

I do some operation on \"big\" file (around 4Mb)

I do this : 1. Get all files from a directory and place them in an IList MyInfoClass has properties : name, extensio

Answer 1

The application freezes because you are performing the file parsing in the main thread. You could use BackgroundWorker to perform operation on a new thread. Here's some pseudo code that might help you to get started:

private void button1_Click(object sender, EventArgs e)
{
    var worker = new BackgroundWorker();
    worker.DoWork += (s, args) =>
    {
        // Here you perform the operation and report progress:
        int percentProgress = ...
        string currentFilename = ...
        ((BackgroundWorker)s).ReportProgress(percentProgress, currentFilename);
        // Remark: Don't modify the GUI here because this runs on a different thread
    };
    worker.ProgressChanged += (s, args) =>
    {
        var currentFilename = (string)args.UserState;
        // TODO: show the current filename somewhere on the UI and update progress
        progressBar1.Value = args.ProgressPercentage;
    };
    worker.RunWorkerCompleted += (s, args) =>
    {
        // Remark: This runs when the DoWork method completes or throws an exception
        // If args.Error != null report to user that something went wrong
        progressBar1.Value = 0;
    };
    worker.RunWorkerAsync();
}