I've read many examples about threads and asynchronous..., but I can't make the UI in wpf c# not freeze when calculating files on a disk - I can't move the window..., I have to wait that the counting process ends. Once the counting is finished, control of the user interface is resumed.
My button code and the counting result in a texbox
public static long DirSize(DirectoryInfo d)
{
long size = 0;
FileInfo[] fis = d.GetFiles();
foreach (FileInfo fi in fis)
try
{
{
size += fi.Length;
}
}
catch
{
}
private async void Save_bkp_Click(object sender, RoutedEventArgs e)
{
await Task.Run(() =>
{
Dispatcher.Invoke(new Action(() => {
TextBox_Dimensioni.Text = Convert.ToString((double)DirSize(new DirectoryInfo(CopiaFoto)));
}));
});
}
If I don't put Dispatcher.Invoke I get the error: The calling thread cannot access this object because this object is owned by another thread.
I've tried many ways but nothing always freezes...
Run the long running part inside of a task and await it. Then update the controls with the result.
This will take care to return to the initial synchronization context (in this case: the UI thread).
private async void Save_bkp_Click(object sender, RoutedEventArgs e)
{
var size = await Task.Run( () => DirSize( new DirectoryInfo(CopiaFoto) ) );
TextBox_Dimensioni.Text = size.ToString();
}