ASP.NET Multithreading Web Requests

Question

I\'m building a page in my ASP.NET solution that retrieves most of its data from a 3rd Party API Service.

The page itself will need to make approximately 5 individu

Answer 1

Multithreading is not recommended on ASP.NET; because ASP.NET/IIS does its own multithreading, and any multithreading you do will interfere with those heuristics.

What you really want is concurrency, more specifically asynchronous concurrency since your operations are I/O-bound.

The best approach is to use HttpClient with the Task-based Asynchronous Pattern:

public async Task GetOccupationAsync(string requestUrl)
{
  // You can also reuse HttpClient instances instead of creating a new one each time
  using (var client = new HttpClient())
  {
    var response = client.GetStringAsync(requestUrl);
    return new JsonSerializer().Deserialize(new JsonTextReader(new StringReader(response)));
  }
}

This is asynchronous, and you can easily make it concurent by using Task.WhenAll:

List urls = ...;
OccupationSearch[] results = await Task.WhenAll(urls.Select(GetOccupationAsync));