public MainWindowViewModel()
{
_searchText = string.Empty;
_hostsFilePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), @"drivers\etc");
_hostsFileName = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.System), @"drivers\etc\hosts");
_hostItems = new ObservableCollection <HostItem>();
_filteredHostItems = new ObservableCollection <HostItem>();
_hostItems.CollectionChanged += _hostItems_CollectionChanged;
_targets = new ObservableCollection <TargetAddress>();
Browsers = BrowserHelper.GetInstalledBrowsers();
SelectedHostItemBindingChanged = new SelectedHostItemBindingChangedCommand(this);
ClearSelectedTargetTag = new ClearSelectedTargetTagCommand(this);
LaunchBrowser = new LaunchBrowserCommand(this);
LoadHostsFile();
ParseHostFileContents();
PropertyChanged += MainWindowViewModel_PropertyChanged;
_hostsWatcher = new FileSystemWatcher();
_hostsWatcher.Path = _hostsFilePath;
_hostsWatcher.NotifyFilter = NotifyFilters.LastWrite;
_hostsWatcher.Changed += _hostsWatcher_Changed;
_hostsWatcher.EnableRaisingEvents = true;
}
