Using async and await that updates data in real time - wpf

Question

I have tried the code mentioned in this answer: https://stackoverflow.com/a/27089652/
It works fine and I want to use it for running a PowerShell script in for loop. GUI was freezing initially then I tried the code mentioned in this answer: https://stackoverflow.com/a/35735760/
Now GUI does not freeze while the PowerShell script is running in the background although nothing is updated in the textbox until for loop is complete. I want to see the results updating in real time. Here is the code I am running:
private async void run_click(object sender, RoutedEventArgs e)
{
Text1.Text = "";
await Task.Run(() => PS_Execution(Text1));
}
internal async Task PS_Execution(TextBox text)
{
PowerShell ps = PowerShell.Create();
ps.AddScript(script.ToString());
{
Collection<PSObject> results = ps.Invoke();
foreach (PSObject r in results)
{
text.Dispatcher.Invoke(() =>
{
text.Text += r.ToString();
});
await Task.Delay(100);
}
}
}
Maybe I am missing something important. Please help me understand how to solve this problem.

Answer 1

Instead of using ps.Invoke() which is synchronous call and will wait for all results to return use ps.BeginInvoke() instead. Then subscribe to the DataAdded event of the output PSDataCollection and use the action to update your ui.
private async void run_click(object sender, RoutedEventArgs e)
{
Text1.Text = "";
await Task.Run(() => PS_Execution(Text1));
}
internal async Task PS_Execution(TextBox text)
{
using PowerShell ps = PowerShell.Create();
ps.AddScript(script.ToString());
PSDataCollection<string> input = null;
PSDataCollection<string> output = new();
IAsyncResult asyncResult = ps.BeginInvoke(input, output);
output.DataAdded += (sender, args) =>
{
var data = sender as PSDataCollection<string>;
text.Dispatcher.Invoke(() =>
{
text.Text += data[args.Index];
});
};
}