Page freeze. High cpu usage

[damirdev]

Describe the bug

Please provide as much information as you can. Type program

using System;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;

public class Program
{
  public static async Task Main()
  {
    await new HttpClient().GetAsync("http://github.com/");
  }
}

Did this error occur while using dotnet try or online?

• [ ] dotnet-try
• [x] online

What kind of error was it?

• [ ] User Interface (UI): For example the output never displayed
• [ ] Service Error: For example "The service is temporarily unavailable. We are working on it"
• [x] Other: Page freeze with high cpu usage

Screenshots

If applicable, add screenshots to help explain your problem.

Please complete the following:

• OS
  • [ ] Windows 10
  • [ ] macOS
  • [ ] Linux (Please specify distro)
  • [ ] iOS
  • [ ] Android
• Browser
  • [x] Chrome
  • [ ] Edge
  • [ ] Safari

[jonsequitur]

It's a known limitation of this version that async/await will hang. We're hoping to fix this when we move to the GA release of Blazor WASM.

[jonsequitur]

See also: #242, #527.

[noseratio]

Still hangs, simpler to repro with Task.Delay, click to repro:

using System;
using System.Threading.Tasks;

public class Program
{
  public async static Task Main()
  {
    await Task.Delay(1000);
    Console.WriteLine("Hello after a delay!");
  }
}