CODEWITHSUNDEEP
c#
Secret veiwer
Secret veiwer

Reputation: 21

Is there a way to ignore argument in delegate, for cleaner code in C#

I have Action<string, string>, but in subscribed method I don't need that data. Can I subscribe method without those arguments somehow? I just don't want to make useless arguments. And I cant just make that action's data blank, since it's needed in other script

public Action<string, string> onKill;

Other script

health.OnKill += AddArmor; // Here I want to make AddArmor argumentless, but because of delegate, I can't

Upvotes: 0

Views: 263

Answers (2)

Ishwor Khatiwada
Ishwor Khatiwada

Reputation: 174

C#, you can use the _ (underscore) symbol to ignore arguments in delegates HERE in your case Yes, you can use a lambda expression to ignore the arguments when subscribing the method to the delegate.

health.OnKill += (_, __) => AddArmor();

Here, the lambda expression ignores both arguments from the Action<string, string> delegate by assigning them to _ and __ respectively. The AddArmor method is then invoked without any arguments.

Upvotes: 1

Jeppe Stig Nielsen
Jeppe Stig Nielsen

Reputation: 62002

The usual thing to do is to wrap it in a small lambda:

health.OnKill += (x, y) => AddArmor();

The old syntax for anonymous function offers to leave out x and y altogether:

health.OnKill += delegate { AddArmor(); };

Upvotes: 1

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