Knowledge Base

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====== Call Async Method from Non-Async Method ======

When you call an asynchronous method with an await, the method you're calling //from// must also be asynchronous.  But, sometimes that's problematic: Perhaps you're working with existing code, or you're implementing code in a context where it's difficult to make it asynchronous.

You can "localize" the management of asynchronous calls using ''Task.Run()''.  In the following code, look at the two instances of ''Task.Run()'', ''Wait()'', and ''Result'' to see how to do it:

<code csharp>
using (HttpContent content = new StringContent(text, Encoding.UTF8, "text/xml"))
using (HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Post, url))
{
    request.Headers.Add("SOAPAction", "");
    request.Content = content;
    var task1 = Task.Run(() => httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead));
    task1.Wait();
    var response = task1.Result;

    var task2 = Task.Run(() => response.Content.ReadAsStreamAsync());
    task2.Wait();
    var stream = task2.Result;

    using var reader = new StreamReader(stream);
    return reader.ReadToEnd();
}
</code>

{{tag>dotnet}}