Calling a constructor from another constructor

[Tom P.]

I am writing a class with several constructors and don't want to
repeat the code. How can I call a constructor from another
constructor?
Example:
class Foo
{
public Foo(string FName, string LName)
{
...some code ...
}

public Foo(string FName)
{
Foo(FName, String.Empty);
}

}

I keep getting "Foo is a type but is used like a variable" errors.

How do I implement this?

Tom P.

[Peter Duniho]

Re: Calling a constructor from another constructor

On Fri, 25 Jul 2008 13:29:00 -0700, Tom P. <padilla.henry@ gmail.comwrote:

[...]
public Foo(string FName, string LName)
{
...some code ...
}
>
public Foo(string FName)
{
Foo(FName, String.Empty);
}
>
}
>
I keep getting "Foo is a type but is used like a variable" errors.
>
How do I implement this?

Use the "this" keyword to call the constructor. Note that you'll have to
put the call as part of the method declaration, rather than inside the
method itself.

Pete

[Jon Skeet [C# MVP]]

Re: Calling a constructor from another constructor

Tom P. <padilla.henry@ gmail.comwrote:

I am writing a class with several constructors and don't want to
repeat the code. How can I call a constructor from another
constructor?
Example:
class Foo
{
public Foo(string FName, string LName)
{
...some code ...
}
>
public Foo(string FName)
{
Foo(FName, String.Empty);
}
>
}
>
I keep getting "Foo is a type but is used like a variable" errors.
>
How do I implement this?

public Foo (string FName) : this(FName, String.Empty)
{
}

You can call a base type constructor with "base" instead of "this".

You can only call one other constructor, you have to do it with the
above syntax (before anything else is executed, apart from variable
initializers), and you can't use "this" anywhere in the call, either
implicitly or explicitly.

--
Jon Skeet - <skeet@pobox.co m>
Web site: http://www.pobox.com/~skeet
Blog: http://www.msmvps.com/jon.skeet
C# in Depth: http://csharpindepth.com