C# 7 tuples and lambdas

Question

With new c# 7 tuple syntax, is it possible to specify a lambda with a tuple as parameter and use unpacked values inside the lambda?

Example:

var list         


        

Answer 1

Deconstructions in C# 7.0 support three forms:

• deconstruction-declaration (like (var x, var y) = e;),
• deconstruction-assignment (like (x, y) = e;),
• and deconstruction-foreach (like foreach(var(x, y) in e) ...).

Other contexts were considered, but likely have decreasing utility and we couldn't complete them in the C# 7.0 timeframe. Deconstruction in a let clause (let (x, y) = e ...) and in lambdas seem good candidates for future expansion.

The latter is being discussed in https://github.com/dotnet/csharplang/issues/258

Do voice your feedback and interest there, as it will help champion proposals.

More details on what was included in C# 7.0 deconstruction in the design doc.