C# - How to skip parameters with default values?

Question

Consider the following method example:

public void MyMethod (string par1, bool par2 = "true", string par3="")
{
}

Now let's say that I call MyMethod and set par3's value to "IamString".

How could I do that without setting par2's value to true or false?

I basically want to leave par2 value to its default.

I'm asking this because in Flash's ActionScript it is possible to do that by using the keyword default so I could call MyMethod ("somestring", default, "IamString") and par2 would be interpreted as true, which is its default value. I wonder if it is possible in C# as well.

Named arguments: msdn.microsoft.com/en-us/library/dd264739.aspx — asawyer
– asawyer, Commented Aug 10, 2012 at 12:20

SeToY · Accepted Answer · 2012-08-10 12:25:54Z

17

public void MyMethod (string par1, bool par2 = "true", string par3=""){}
Myclass.MyMethod(par1:"par1", par3:"par3");

By the way, this won't work: bool par2 = "true"

string par2 = "true"

or

bool par2 = true

Talking about default values, you could also use this to get the default value for a particular type:

default(T)

edited Aug 10, 2012 at 12:25

answered Aug 10, 2012 at 12:20

SeToY

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3 Comments

IneedHelp Over a year ago

Thank you! And yeah, you're right bool par2 = "true" won't work. It's a mistake I've did while trying to layout a simple example.

IneedHelp Over a year ago

Yes, it just doesn't let me because you recently edited your answer. I will be able to accept it in 1 minute.

John Thoits Over a year ago

Warning to anyone who takes this as a correct answer: using default(T) will NOT respect the default value provided in the declaration of the function being called, it will instead use the default value for that type, which for a bool will be false even though the function wants the default value to be true

tuxtimo · Accepted Answer · 2012-08-10 12:20:34Z

14

You can specify this by name the parameter:

instance.MyMethod( "Hello", par3:"bla" );

Have a look here.

And there is another bug:

bool par2 = true

is correct..

answered Aug 10, 2012 at 12:20

tuxtimo

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2 Comments

IneedHelp Over a year ago

Your answer is equally useful to SeToY's, but I'll accept his because I spotted it first. Nevertheless, thank you and thumbs up!

John Thoits Over a year ago

This is the correct answer, see my comment on the accepted but incorrect answer

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