c# - Is it possible to create a delegate for *any* Action? -

c# - Is it possible to create a delegate for *any* Action<T>? -

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why covariance , contravariance not back upwards value type 4 answers

i'm trying figure out why doesn't work:

public void defaultaction( object obj = null ){} public void start() { somereferencetype obj; defaultaction( obj ); //works int i; string s; defaultaction( ); //works defaultaction( s ); //works } //however... public event action onnullaction = defaultaction; //works public event action<somereferencetype> onobjectaction = defaultaction; //works public event action<int> onintaction = defaultaction; //doesn't work!!

trying bind void(object) action<valuetype> throws parameter mismatch error, though can phone call function straight int/string/bool have you. there mysterious boxing/unboxing happening? , regardless, possible create delegate can respond action<t>?

just create generic

public void defaultaction<t>(t param) { }

c# events parameters delegates action