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2011-05-19T20:39:19.540
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2011-05-24T13:52:23.030
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Use <a href="http://msdn.microsoft.com/en-us/library/dd383458.aspx" rel="nofollow"><code>Directory.EnumerateFiles</code></a> instead of <code>Directory.GetFiles</code>. <code>EnumerateFiles</code> will return the files as they're found by the system - not wait for all of them to be found. Do this on a background thread and use <code>Dispatcher.Invoke</code> or <code>Dispatcher.BeginInvoke</code> to the UI thread as each one is found to add it to the <code>ListBox</code>. Here's a quick example I threw together. Here's the XAML: <pre><code><Window x:Class="WpfApplication1.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="MainWindow" Height="350" Width="525"> <Grid> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="Auto" /> </Grid.RowDefinitions> <ListBox x:Name="_FileList" /> <Button Grid.Row="1" Content="Go!" Click="Button_Click" /> </Grid> </Window> </code></pre> and here's the code-behind: <pre><code>using System; using System.IO; using System.Windows; namespace WpfApplication1 { /// <summary> /// Interaction logic for MainWindow.xaml /// </summary> public partial class MainWindow : Window { private Action<string> _AddToListBox; public MainWindow() { InitializeComponent(); _AddToListBox = AddToListBox; } private void Button_Click(object sender, RoutedEventArgs e) { Action action = Go; action.BeginInvoke(null, null); } private void Go() { foreach (var file in Directory.EnumerateFiles(@"c:\windows\system32\")) { Dispatcher.BeginInvoke(_AddToListBox, file); } } private void AddToListBox(string toAdd) { _FileList.Items.Add(toAdd); } } } </code></pre> by no means do I intend for this to be a best-practices or all-encompassing example. Just showing you one way to do it. By the way, I picked the system32 directory just because it has a lot of files in it so I could test it. Still works almost instantly on my machine though.
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