How to display progress in a long-running process in Blazor WASM

there are any number of progress bars, spinner, popup dialog available in html.

• If the progress display is all javascript/html you can use jsinterop to update.
• current blazer WASM is single threaded (all threading is cooperative co-routines). if you want to use razor to update, then you will need to allow the UI main loop to run:

var notDone = true;
while (notDone)
{
   notDone = DoSomeWork();// Make the steps as small as possible, Task.Run is of no use
   StateHasChanged();     // force ui update
   await Task.Delay(1);   // give the UI some time to catch up
}

you can also use Web Workers to get a separate thread to do the long running process, but this would require converting the long running code to javascript.