.NET 4.5 异步IO 相关实例

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private void Button_Click_3(object sender, RoutedEventArgs e)
        {
            System.ComponentModel.BackgroundWorker bak = new System.ComponentModel.BackgroundWorker();
            bak.DoWork += bak_DoWork;
            bak.RunWorkerCompleted += bak_RunWorkerCompleted;
            bak.RunWorkerAsync();         
        }

        void bak_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
        {
            string sourceDir = @"E:\";
            string endDir = @"F:\";
            foreach (string filename in Directory.EnumerateFiles(sourceDir))
            {
                using (FileStream SourceStream = File.Open(filename, FileMode.Open))
                {
                    using (FileStream DestinationStream = File.Create(endDir + filename.Substring(filename.LastIndexOf('\\'))))
                    {
                        SourceStream.CopyTo(DestinationStream);
                    }
                }
            }
        }

        void bak_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e)
        {
            MessageBox.Show("ok");
        }

private async void Button_Click_2(object sender, RoutedEventArgs e)
        {
            string sourceDir = @"E:\";
            string endDir = @"F:\";
            foreach (string filename in Directory.EnumerateFiles(sourceDir))
            {
                using (FileStream SourceStream = File.Open(filename, FileMode.Open))
                {
                    using (FileStream DestinationStream = File.Create(endDir + filename.Substring(filename.LastIndexOf('\\'))))
                    {
                        await SourceStream.CopyToAsync(DestinationStream);
                    }
                }
            }
            MessageBox.Show("ok");
        }