CODEWITHSUNDEEP
c#boolean
Shaokan
Shaokan

Reputation: 7684

what does bool? isActive = false mean in c#?

As the question depicts, what does the following code mean?

public void blabla (bool? isActive = false) {

}

Upvotes: 4

Views: 2886

Answers (5)

Adam Houldsworth
Adam Houldsworth

Reputation: 64487

Well, it is a void method (returns nothing) taking an optional parameter (isActive = false) of a nullable boolean (bool?), where the default value is false.

It is a public method, meaning that code that has access to the class / struct that contains this method can see the method. The public is called an access modifier.

Access modifiers:

http://msdn.microsoft.com/en-us/library/wxh6fsc7(v=VS.100).aspx

Optional parameters:

http://msdn.microsoft.com/en-us/library/dd264739.aspx

Nullable types:

http://msdn.microsoft.com/en-us/library/1t3y8s4s(v=VS.100).aspx

As for it's significance, that depends if it's responsible for keeping planes in the air or not :-P

Upvotes: 8

Mark Segal
Mark Segal

Reputation: 5550

It means it makes a new method, and a parameter with a DEFAULT value - that means you can call it by two ways:
blabla(true); or blabla(false) or blabla(null)
or:
blabla() and it'll give the default value of FALSE.

Upvotes: 1

dgorissen
dgorissen

Reputation: 6305

It makes bool a nullable type:

See: http://msdn.microsoft.com/en-us/library/1t3y8s4s.aspx

Upvotes: 1

WestDiscGolf
WestDiscGolf

Reputation: 4108

its an optional parameter of nullable boolean with a default value of false

Upvotes: 2

Jeff Foster
Jeff Foster

Reputation: 44706

bool? indicates that it's a nullable type, supporting true, false or null. = false indicates that if a value isn't supplied, it is false which is the default value.

Upvotes: 6

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