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.
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:
.LastOrDefault()
accompanied with appropriate null
handling, or .Last()
, first check with if (... .Any())
if it is OK to call .Last()
.
For further reference, see LINQ Element Operations
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