I wrote the following code:
private string makeMailContents(Klant klant, Mail mail) { var builder = new BodyBuilder(); var path = Path.Combine("wwwroot/trackers/track_open.png"); var img = builder.LinkedResources.Add(path); byte[] data = Convert.FromBase64String(mail.Content); string decoded = Encoding.UTF8.GetString(data); string code; string final = ""; Regex regex = new Regex(@"\[([^]]*)\]"); img.ContentId = MimeUtils.GenerateMessageId(); var splitContent = decoded.Split(' '); foreach(string word in splitContent) // this is line 265 { if (word.Contains('[') && word.Contains(']')) { try { code = Regex.Match(word, @"\[([^]]*)\]").Groups[1].Value.ToLower(); switch (code) { case "voornaam": final += regex.Replace(word, klant.vnaam) + ' '; break; case "achternaam": final += regex.Replace(word, klant.anaam) + ' '; break; case "naam": final += regex.Replace(word, klant.vnaam + ' ' + klant.anaam + ' '); break; case "onderwerp": final += regex.Replace(word, mail.Onderwerp + ' '); break; case "datum": final += regex.Replace(word, DateTime.Now.ToString("dd-MM-yyyy") + ' '); break; } } catch (Exception ex) { final += ex; } } else { final += word + ' '; } } } Whenever I run this code on my local machine and my test server it executes the code like it should without any exceptions.
But whenever I host this on my current live server it throws the following exception:
InvalidOperationException: Sequence contains no elements
And this exceptions keeps pointing towards the splitContent and it tells me that it doesn't contain elements. And yes, the mail.Content is filled with a valid base64 string, I checked both with fiddler and postman.
Does anyone have the slightest clue of what's going on here? I'm also not sure if it's the IIS settings or somehow my code. I normally have a colleague who manages the IIS but he is on vacation right now. Can someone help me out with this?
This is the data the mail receives when called:
{ "Onderwerp":"Dit is een test campagne", "afzender":1, "campagne":1, "Content":"PHA+RGl0IGlzIGVlbiB0ZXN0IG1hYXQ8L3A+Cg==", "docs":"['kamer2.jpg']", "template":null, "verzenddat":"8/17/18, 3:55 PM" } full exception:
System.InvalidOperationException: Sequence contains no elements at System.Linq.Enumerable.Last[TSource](IEnumerable`1 source) at lambda_method(Closure , QueryContext ) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.<>c__DisplayClass17_1`1.<CompileQueryCore>b__0(QueryContext qc) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query) at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression) at System.Linq.Queryable.Last[TSource](IQueryable`1 source) at MailerAPI.Mailer.Sender.makeMailContents(Klant klant, Mail mail) in C:\Users\Hofkey\Source\Repos\MailerAPI\MailerAPI\Mailer\Sender.cs:line 265 at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2) at MailerAPI.Mailer.Sender.<sendMessage>d__7.MoveNext() in C:\Users\Hofkey\Source\Repos\MailerAPI\MailerAPI\Mailer\Sender.cs:line 161 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at MailerAPI.Controllers.MailController.<Post>d__13.MoveNext() in C:\Users\Hofkey\Source\Repos\MailerAPI\MailerAPI\Controllers\MailController.cs:line 96 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__12.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextActionFilterAsync>d__10.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeInnerFilterAsync>d__14.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeNextResourceFilter>d__22.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeFilterPipelineAsync>d__17.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeAsync>d__15.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Builder.RouterMiddleware.<Invoke>d__4.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Cors.Infrastructure.CorsMiddleware.<Invoke>d__7.MoveNext() --- End of stack trace from previous location where exception was thrown --- at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext() The exception also gets thrown when I replace the model properties with just a plain string.
UPDATE Whenever I run this code in my values controller to test the decoded.split(' ') it actually works. When I return the decoded.split(' ') I actually get an array of strings.
So now I know that the problem only occurs within the method, which is located in a Sender class and being called in the MailerController, and it also only occurs in the current server.
1 Answers
Answers 1
You appear to be making a call to .Last() at or through the code located at C:\Users\Hofkey\Source\Repos\MailerAPI\MailerAPI\Mailer\Sender.cs:line 265.
The Linq extension method .Last() demands that there is at least one item that it can grab. To work around this requirement, you have various options:
- use
.LastOrDefault()accompanied with appropriatenullhandling, or - before using
.Last(), first check withif (... .Any())if it is OK to call.Last().
For further reference, see LINQ Element Operations
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