"Syntax error" when using C# 6 lambda methods

[ryanlewis]

I had a partial implementation of a model, which contained a getter which uses the new C# 6 shorthand:

public IPublishedContent AppointmentBooker => this.Descendant("AppointmentBooker");

When regenerating my models, I received the following error:

ZbuModelsBuilder: Starting v2.1.3.52 22/09/2015 16:14:00.
ZbuModelsBuilder: ZbuModelsBuilder failed to generate code: Exception: Response status code does not indicate success (InternalServerError)
{"Message":"An error has occurred.","ExceptionMessage":"Syntax error in file \"C:\\dev\\site\\src\\Site.Web\\Models\\Dashboard.cs\".","ExceptionType":"System.Exception","StackTrace":"   at Zbu.ModelsBuilder.Building.Compiler.<>c__DisplayClass3.<GetCompilation>b__0(KeyValuePair`2 x)\r\n   at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()\r\n   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)\r\n   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)\r\n   at Zbu.ModelsBuilder.Building.Compiler.GetCompilation(String assemblyName, IDictionary`2 files, SyntaxTree[]& trees)\r\n   at Zbu.ModelsBuilder.Building.CodeParser.Parse(IDictionary`2 files, IEnumerable`1 referencedAssemblies)\r\n   at Zbu.ModelsBuilder.AspNet.ModelsBuilderApiController.GetModels(GetModelsData data)\r\n   at lambda_method(Closure , Object , Object[] )\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n   at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Web.Http.Filters.ActionFilterAttribute.<CallOnActionExecutedAsync>d__5.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Filters.ActionFilterAttribute.<ExecuteActionFilterAsyncCore>d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n   at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()"}
ZbuModelsBuilder:    at Zbu.ModelsBuilder.AspNet.ModelsBuilderApi.EnsureSuccess(HttpResponseMessage result)
   at Zbu.ModelsBuilder.AspNet.ModelsBuilderApi.GetModels(Dictionary`2 ourFiles, String modelsNamespace)
   at Zbu.ModelsBuilder.CustomTool.CustomTool.ZbuModelsBuilder.GenerateRaw(String wszInputFilePath, String wszDefaultNamespace, IntPtr[] rgbOutputFileContents, UInt32& pcbOutput, String& errMsg)

[zpqrtbnk]

Unfortunately, at the moment the parser is hard-wired to use CSharp 5. Quite easy to fix, though, so that it uses the configuration settings to decide which version of CSharp to use. Will do.

[zpqrtbnk]

Will require the following app settings (as CSharp5 remains the default for now):

  <add key="Zbu.ModelsBuilder.LanguageVersion" value="CSharp6" />

[zpqrtbnk]

Should be fixed w/2.1.5 - with setting the above app settings in web.config. Let me know.

[ryanlewis]

Took a while to reply to you, but tested today and worked a treat. \o/

[zpqrtbnk]

Woot! Thanks for the reply!