How to call other constructors from a constructor in c#?

Question

I have a constructor like:

public Blah(string a, string b)
{

}

public Blah(string a, string b, string c)
{
  this.a =a;
  this.b =b;
  this.c =c;
}

How can I call the 2nd constructor from the 1st one?

like:

public Blah(string a, string b)
{
   Blah(a,b, "");
}

BTW, that's generally referred to as constructor chaining.

Roman
– Roman

2010-04-15 15:29:40 +00:00
Commented Apr 15, 2010 at 15:29 — Roman
– Roman, Commented Apr 15, 2010 at 15:29

LukeH · Accepted Answer · 2010-04-15 15:28:45Z

9

public Blah(string a, string b) : this(a, b, "")
{
}

public Blah(string a, string b, string c)
{
    // etc
}

answered Apr 15, 2010 at 15:28

LukeH

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5 Comments

abatishchev Over a year ago

It's better to use String.Empty instead of ""

LukeH Over a year ago

@abatishchev: Do you have a reference for that? As far as I'm concerned it's just down to personal preference and what you find more readable. I prefer "".

AndersK Over a year ago

"" (potentially) creates an object, String.empty doesn't.

LukeH Over a year ago

@Anders: object.ReferenceEquals("", string.Empty) evaluates as true on my machine - ie, they're the same interned string object. (And even if that isn't always the case, I can live with one extra, tiny interned string per assembly.)

AndersK Over a year ago

yep, has very little practical impact in most cases

abatishchev · Accepted Answer · 2010-04-15 15:31:32Z

5

public Blah(string a, string b): this(a, b, String.Empty)
{

}

public Blah(string a, string b, string c)
{
  this.a =a;
  this.b =b;
  this.c =c;
}

edited Apr 15, 2010 at 15:31

abatishchev

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answered Apr 15, 2010 at 15:29

Kimi

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Comments

Charles Bretana · Accepted Answer · 2010-04-15 15:29:35Z

1

public Blah(string a, string b) : this(a,b, "default_C_String")
{ 

}

--- whatever your desired default value is for C ...

answered Apr 15, 2010 at 15:29

Charles Bretana

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Comments

It Man · Accepted Answer · 2013-03-02 16:02:06Z

-2

public Blah(string a, string b): this(a, b, String.Empty) {

}

answered Mar 2, 2013 at 16:02

It Man

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