Why does this async code sometimes fail, and only when not observed?

Question

This is the original code that had been running fine for a few weeks. In a test I just did, it failed 0 out of 100 attempts.

using (var httpClient = new Http         


        

Answer 1

To address the comment from to your other question, you very rarely need to mix async/await with ContinueWith. You can do the "fork" logic with help of async lambdas, e.g., the code from the question may look like this:

using (var httpClient = new HttpClient())
{
    Func>> doTask1Async = async () =>
    {
        var request = await httpClient.GetAsync(new Uri("..."));
        return response.Content.ReadAsAsync>();
    };

    Func>> doTask2Async = async () =>
    {
        var request = await httpClient.GetAsync(new Uri("..."));
        return response.Content.ReadAsAsync>();
    };

    var task1 = doTask1Async();
    var task2 = doTask2Async();

    await Task.WhenAll(task1, task2);

    var result1 = task1.Result;
    var result2 = task2.Result;

    // ...
}