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Taking this example (ASP.Net MVC View):
<%@ Page Language="C#" Inherits="System.Web.Mvc.ViewPage" %>
If I just type <% , and then hit ctrl+space to show AutoCompletion, an ArgumentNullException is throwed :
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.ArgumentNullException: Argument cannot be null.
Parameter name: completionContextProvider
Then, the autocompletion no longer work until I close & reopen the document.
MonoDevelop.CSharp.Completion.CSharpCompletionTextEditorExtension.cs L 228 seems to cause this Exception, since typeSystemSegmentTree is null.
Workaround : add a check before the new CSharpCompletionEngine call :
if (typeSystemSegmentTree == null)
I'm gonna do a pull request on the master branch to purpose the patch.
NOTE : It's just prevent the IDE from crashing, but autocompletion doesn't work much.
(The ASP.NET completion needs a redesign - atm we don't have many resources to fix that properly)