How to explicitly discard an out argument?

Question

I'm making a call:

myResult = MakeMyCall(inputParams, out messages); 

but I don't actually care about the messages. If it was an input parameter I didn't care about I'd just pass in a null. If it was the return I didn't care about I'd just leave it off.

Is there a way to do something similar with an out, or do I need to declare a variable that I will then ignore?

Answer 1

Starting with C# 7.0, it is possible to avoid predeclaring out parameters as well as ignoring them.

public void PrintCoordinates(Point p) {     p.GetCoordinates(out int x, out int y);     WriteLine($"({x}, {y})"); }  public void PrintXCoordinate(Point p) {     p.GetCoordinates(out int x, out _); // I only care about x     WriteLine($"{x}"); } 

Source: https://blogs.msdn.microsoft.com/dotnet/2017/03/09/new-features-in-c-7-0/