C# Autocomplete: Lambda embedded Anonymous Types

SyntaxEditor for WPF Forum

Posted 7 years ago by Jack Nicholson
Version: 12.1.0561
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Hi,

C# Autocomplete doesn't work on this code:

var a = Enumerable.Range(0,10)
.Select(i=>new{
Number=i});

a.Last().

Comments (4)

Posted 7 years ago by Actipro Software Support - Cleveland, OH, USA
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Hi Jack,

Thanks for the note.  At the moment, our resolver doesn't know how to determine a lambda's return type and use it in the calling Select method's return type when executed in this sort of context.  We've marked it down to look into in the future.


Actipro Software Support

Posted 7 years ago by Jack Nicholson
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OK well.  Visual Studio quality contexts for autocomplete is very important for my project.  So I will check back to your blog regularly and if you have this ready in a reasonable amount of time, I will purchase the appropriate licenses.  Thanks.

Posted 7 years ago by Jack Nicholson
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Is it possible to do a hacking type solution in code where I could modify the list of the CompletionItems (or modify resolver) by looking at the AST?

Posted 7 years ago by Actipro Software Support - Cleveland, OH, USA
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Hi Jack,

While you can override methods on CSharpCompletionProvider like OnSessionOpening (which you can use to filter/change what will show in the completion list), that only fires if the provider determines it has something to show.  The problem here is that the resolver needs to be returning results for this scenario.  You also could override CSharpCompletionProvider.CreateContext and make sure the IDotNetContext.Resolve method returns appropriate items.  But still, anything dealing with lambdas is extremely complex so there probably aren't any quick fixes for this on your end since it deals with lambdas, method overloads, resolving nested generic type parameters, etc.


Actipro Software Support

The latest build of this product (v2019.1 build 0683) was released 1 month ago, which was after the last post in this thread.

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