How to factorize async to parallel execution? Instead of each by one

Question

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I try to use parallel execution, in each foreach instead of waiting for GetByLastId function to return , but due to the await inside the GetByLastId function it is not response to the HttpClientResponse

What I have tried:

C#

foreach( DataRow item in dt.Rows)
 {
   var response = await RestApIHelper.GetByLastDate(item["Url"].ToString(), fetchAllFirstTime.token, Convert.ToDateTime(item["LastDate"]));

   var data = JsonConvert.DeserializeObject<List<createReservation>>(response);
  roomCreateOrUpdateViaAPI(data, "insert");
 }


GetByLastDate function

public static async Task<string> GetByLastDate(string specificUrl, string token, DateTime date)
{
   try
     {
       string fullUrl = baseUrl + specificUrl+ date;
       using (var requestMessage = new HttpRequestMessage(HttpMethod.Get, fullUrl))
        {
         requestMessage.Headers.Add("access_token", token);
         HttpResponseMessage res = await policy.ExecuteAsync(() => client.SendAsync(requestMessage));
       using (HttpContent content = res.Content)
        {
          string data = await content.ReadAsStringAsync();
          if (data != null)
          {
            return data;
          }
        }
         return string.Empty;
      }
  }

Posted 6-Sep-21 22:37pm

Member 14921707

Updated 6-Sep-21 23:00pm

v2

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Member 14921707 · Accepted Answer · 2021-09-06T23:00:00

I try to factorized like this

List<Task<string>> Tasks = new List<Task<string>>();

foreach( DataRow item in dt.Rows)
    {
     Tasks.Add( RestApIHelper.GetByLastDate(item["Url"].ToString(), fetchAllFirstTime.token, Convert.ToDateTime(item["LastDate"])) );
     }

     var responses = await Task.WhenAll(Tasks);
     foreach(string response in responses)
     {
       var data = JsonConvert.DeserializeObject<List<createReservation>>(response);
                       roomCreateOrUpdateViaAPI(data, "insert");
 }