Null-propagating operator ?. in Expression Trees

[NetMage]

Expression Trees should be extended to support the C# 6.0 null propagating operator so that it can be used with Linq, with a translation to allow providers such as Linq to SQL to work.

The discussion on CodePlex doesn't seemed to have moved over to here, and has been sitting around for 3 years - I think it is worth revisiting, and ideally implementing. An ideal use case is an Outer Join in Linq to Objects.

https://roslyn.codeplex.com/discussions/571077

[jnm2]

Yes. It has been far, far too long.
This may be covered by #158.

[NetMage]

Good point. Searching for Linq and null didn't help me find it :)

[NetMage]

I copied to other issue and will close this issue.

[leandromoh]

While expression tree does not support the C# 6.0 null propagating, what we can do is create a visitor that modify expression tree for safe null propagation, just like the operator does!

Check this gist NullPropagationVisitor.cs