System.OperationCanceledException: The operation was canceled.

Question

Good Day All

i have the following code, that randomly throws the following error

System.OperationCanceledException: The operation was canceled.

// HttpClient is intended to be instantiated once per application, rather than per-use. See Remarks.
static readonly HttpClient httpClient = new HttpClient();

public async Task<List<USERS>> Get_All_Customers( )
{

             List<USERS> results = null;
             try
             {
                 USERS m_model = new USERS
                 {
                     USER_ID = 1,
                     CURRENT_DATETIME = '2021/07/01'
                 };
                 var httpClient = new HttpClient();

                 httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));


                 var Json = JsonConvert.SerializeObject(m_model, new JsonSerializerSettings
                 {
                     ContractResolver = new DefaultContractResolver
                     {
                         IgnoreSerializableAttribute = false
                     }
                 });


                 HttpContent httpContent = new StringContent(Json, Encoding.UTF8, "application/json");
                 httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Content-Type", "application/json; charset=utf-8");

var response = await httpClient.PostAsync(string.Format("https://www.myserver.com/api/MainCustomers_OnlineDates/Get_All_Customers"), httpContent);

                 if (response.StatusCode == System.Net.HttpStatusCode.OK)
                 {
                     var content = await response.Content.ReadAsStringAsync();
                     results = JsonConvert.DeserializeObject<List<USERS>>(content);
                 }
             }
             catch (Exception ex)
             {
                 await Task.Run(() => Crashes.TrackError(ex));
             }

             return results;
         }

Thanks

Answer 1

also why line 9 when you declared a static as preferred?