Default values for args

[Dragon]

Hi,

Is there a way to set defaults values for args of a function/sub?

For example:

Function:
public function testFunc (name as string, age as integer = 30, phone as
string)

Calling the Function:
testFunc("John" , 25, "555-1212")
testFunc("John" , , "555-1212") ' Age will be set to default of 30

This way one or more of arg can be left out and still have a working
function/sub.

Thank you.

[Brx]

Re: Default values for args

Your so close, it's Public Function testFunc(name as string, phone as
string, optional age as integer = 30)
Optional parameters must be last in the function, so anything after age must
also be optional.

kmurphy
roughly at nexusinfosys in the com domain.

"Dragon" <baadil_nospam@ hotmail.com> wrote in message
news:O$oWwG00FH A.2132@TK2MSFTN GP15.phx.gbl...[color=blue]
> Hi,
>
> Is there a way to set defaults values for args of a function/sub?
>
> For example:
>
> Function:
> public function testFunc (name as string, age as integer = 30, phone as
> string)
>
> Calling the Function:
> testFunc("John" , 25, "555-1212")
> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>
> This way one or more of arg can be left out and still have a working
> function/sub.
>
> Thank you.
>
>[/color]

[Herfried K. Wagner [MVP]]

Re: Default values for args

"Dragon" <baadil_nospam@ hotmail.com> schrieb:[color=blue]
> Is there a way to set defaults values for args of a function/sub?
>
> For example:
>
> Function:
> public function testFunc (name as string, age as integer = 30, phone as
> string)
>
> Calling the Function:
> testFunc("John" , 25, "555-1212")
> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>
> This way one or more of arg can be left out and still have a working
> function/sub.[/color]

You can archieve this behavior with optional parameters:

\\\
Public Sub TestFunc( _
ByVal Name As String, _
Optional ByVal Age As Integer = 30, _
Optional ByVal ID As String = Nothing _
)
...
End Sub
///

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Bob Powell [MVP]]

Re: Default values for args

<sigh> I really miss this in C#...

--
Bob Powell [MVP]
Visual C#, System.Drawing

Ramuseco Limited .NET consulting

http://www.ramuseco.com

Find great Windows Forms articles in Windows Forms Tips and Tricks

http://www.bobpowell.net/tipstricks.htm

Answer those GDI+ questions with the GDI+ FAQ

http://www.bobpowell.net/faqmain.htm

All new articles provide code in C# and VB.NET.
Subscribe to the RSS feeds provided and never miss a new article.





"Brx" <To.News.Group@ plz> wrote in message
news:e6bE7N00FH A.3924@TK2MSFTN GP14.phx.gbl...[color=blue]
> Your so close, it's Public Function testFunc(name as string, phone as
> string, optional age as integer = 30)
> Optional parameters must be last in the function, so anything after age
> must also be optional.
>
> kmurphy
> roughly at nexusinfosys in the com domain.
>
> "Dragon" <baadil_nospam@ hotmail.com> wrote in message
> news:O$oWwG00FH A.2132@TK2MSFTN GP15.phx.gbl...[color=green]
>> Hi,
>>
>> Is there a way to set defaults values for args of a function/sub?
>>
>> For example:
>>
>> Function:
>> public function testFunc (name as string, age as integer = 30, phone as
>> string)
>>
>> Calling the Function:
>> testFunc("John" , 25, "555-1212")
>> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>>
>> This way one or more of arg can be left out and still have a working
>> function/sub.
>>
>> Thank you.
>>
>>[/color]
>
>[/color]

[Dragon]

Re: Default values for args

Thank you :-)

"Brx" <To.News.Group@ plz> wrote in message
news:e6bE7N00FH A.3924@TK2MSFTN GP14.phx.gbl...[color=blue]
> Your so close, it's Public Function testFunc(name as string, phone as
> string, optional age as integer = 30)
> Optional parameters must be last in the function, so anything after age
> must also be optional.
>
> kmurphy
> roughly at nexusinfosys in the com domain.
>
> "Dragon" <baadil_nospam@ hotmail.com> wrote in message
> news:O$oWwG00FH A.2132@TK2MSFTN GP15.phx.gbl...[color=green]
>> Hi,
>>
>> Is there a way to set defaults values for args of a function/sub?
>>
>> For example:
>>
>> Function:
>> public function testFunc (name as string, age as integer = 30, phone as
>> string)
>>
>> Calling the Function:
>> testFunc("John" , 25, "555-1212")
>> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>>
>> This way one or more of arg can be left out and still have a working
>> function/sub.
>>
>> Thank you.
>>
>>[/color]
>
>[/color]

[Dragon]

Re: Default values for args

Is it not available in C#?


"Bob Powell [MVP]" <bob@_spamkille r_bobpowell.net > wrote in message
news:%23zxNKV00 FHA.1168@TK2MSF TNGP10.phx.gbl. ..[color=blue]
> <sigh> I really miss this in C#...
>
> --
> Bob Powell [MVP]
> Visual C#, System.Drawing
>
> Ramuseco Limited .NET consulting
> http://www.ramuseco.com
>
> Find great Windows Forms articles in Windows Forms Tips and Tricks
> http://www.bobpowell.net/tipstricks.htm
>
> Answer those GDI+ questions with the GDI+ FAQ
> http://www.bobpowell.net/faqmain.htm
>
> All new articles provide code in C# and VB.NET.
> Subscribe to the RSS feeds provided and never miss a new article.
>
>
>
>
>
> "Brx" <To.News.Group@ plz> wrote in message
> news:e6bE7N00FH A.3924@TK2MSFTN GP14.phx.gbl...[color=green]
>> Your so close, it's Public Function testFunc(name as string, phone as
>> string, optional age as integer = 30)
>> Optional parameters must be last in the function, so anything after age
>> must also be optional.
>>
>> kmurphy
>> roughly at nexusinfosys in the com domain.
>>
>> "Dragon" <baadil_nospam@ hotmail.com> wrote in message
>> news:O$oWwG00FH A.2132@TK2MSFTN GP15.phx.gbl...[color=darkred]
>>> Hi,
>>>
>>> Is there a way to set defaults values for args of a function/sub?
>>>
>>> For example:
>>>
>>> Function:
>>> public function testFunc (name as string, age as integer = 30, phone as
>>> string)
>>>
>>> Calling the Function:
>>> testFunc("John" , 25, "555-1212")
>>> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>>>
>>> This way one or more of arg can be left out and still have a working
>>> function/sub.
>>>
>>> Thank you.
>>>
>>>[/color]
>>
>>[/color]
>
>[/color]

[Herfried K. Wagner [MVP]]

Re: Default values for args

"Dragon" <baadil_nospam@ hotmail.com> schrieb:[color=blue]
> Is it not available in C#?[/color]

No, it isn't. However, code written in C# can consume/call methods which
have optional parameters.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Dragon]

Re: Default values for args

Hi,

You can have optional arguments, but they must be the last ones in the
list of arguments, e.g.:

~
Public Function TestFunc (ByVal Name As String, ByVal Phone As
String, Optional ByVal Age As Integer = 30) As BadImageFormatE xception
~

I would recommend you to have multiple overloaded versions of function
i.e.:

~
Public Function TestFunc(ByVal Name As String, ByVal Phone As
String) As BadImageFormatE xception
Return TestFunc(Name, Phone, 30)
End Function

Public Function TestFunc(ByVal Name As String, ByVal Phone As
String, ByVal Age As Integer) As BadImageFormatE xception
REM Your code goes here...
End Function
~

HTH,
Roman

[Mythran]

Re: Default values for args


"Dragon" <baadil_nospam@ hotmail.com> wrote in message
news:O$oWwG00FH A.2132@TK2MSFTN GP15.phx.gbl...[color=blue]
> Hi,
>
> Is there a way to set defaults values for args of a function/sub?
>
> For example:
>
> Function:
> public function testFunc (name as string, age as integer = 30, phone as
> string)
>
> Calling the Function:
> testFunc("John" , 25, "555-1212")
> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>
> This way one or more of arg can be left out and still have a working
> function/sub.
>
> Thank you.
>
>[/color]

I don't know why I don't like optional parameters...I think it was because
some other languages don't see those methods when accessing them via COM?
Anywho, a way around it would be:

Public Overloads Function TestFunc(ByVal Name AS String, ByVal Age As
Integer, ByVal Phone As String) As Whatever

End Function

Public Overloads Function TestFunc(ByVal Name As String, ByVal Phone As
String) As Whatever
TestFunc(Name, 30, Phone)
End Function

Public Overloads Function TestFunc(ByVal Name As String)
TestFunc(Name, 30, "555-1212")
End Function

Calls like:

TestFunc("John" , 30, "555-1212")
TestFunc("John" , "555-1212")
TestFunc("John" )

Use overloading to achieve what you want, similarly....

HTH,
Mythran

[Dragon]

Re: Default values for args

Thank you Mythran.



"Mythran" <kip_potter@hot mail.comREMOVET RAIL> wrote in message
news:e%23oGdk10 FHA.712@TK2MSFT NGP10.phx.gbl.. .[color=blue]
>
> "Dragon" <baadil_nospam@ hotmail.com> wrote in message
> news:O$oWwG00FH A.2132@TK2MSFTN GP15.phx.gbl...[color=green]
>> Hi,
>>
>> Is there a way to set defaults values for args of a function/sub?
>>
>> For example:
>>
>> Function:
>> public function testFunc (name as string, age as integer = 30, phone as
>> string)
>>
>> Calling the Function:
>> testFunc("John" , 25, "555-1212")
>> testFunc("John" , , "555-1212") ' Age will be set to default of 30
>>
>> This way one or more of arg can be left out and still have a working
>> function/sub.
>>
>> Thank you.
>>
>>[/color]
>
> I don't know why I don't like optional parameters...I think it was because
> some other languages don't see those methods when accessing them via COM?
> Anywho, a way around it would be:
>
> Public Overloads Function TestFunc(ByVal Name AS String, ByVal Age As
> Integer, ByVal Phone As String) As Whatever
>
> End Function
>
> Public Overloads Function TestFunc(ByVal Name As String, ByVal Phone As
> String) As Whatever
> TestFunc(Name, 30, Phone)
> End Function
>
> Public Overloads Function TestFunc(ByVal Name As String)
> TestFunc(Name, 30, "555-1212")
> End Function
>
> Calls like:
>
> TestFunc("John" , 30, "555-1212")
> TestFunc("John" , "555-1212")
> TestFunc("John" )
>
> Use overloading to achieve what you want, similarly....
>
> HTH,
> Mythran
>[/color]