a few noob vb.net questions

[jobs]

Three noob questions. Please help.

1. Is there a way to have arguments on subroutine that are optional?


2. Say I need to convert datetime to string..in this format :
2006-09-07 23:00:00.000

datef.tostring( )

produces:

'1/1/0001 12:00:00 AM'

I need it to produce something like this:

2006-09-07 23:00:00.000

I know you can do something like this:

..datef.ToStrin g("MM\-dd\-yy")


3. I want to pass a subroutine an argument that might be type string or
might be type datetime.. how can I do this and then use it's value
accordingingly? type Object maybe?

as a bad example to demonstrate the problem.

say..

Public Sub UpdateJob(ByVal field as string, ByVal Value As Object)

will I be able to call UpdateJob

like this

Update(datetime f) (where datetimef is type datetime)
and like this
Update(stringf) (where stringf type string)
and then inside UpdateJob

SQL = "Update job set " + field + "='" + Value

The above of course does not work.

Thank you in advance for any help or information.

[Michael C]

"jobs" <jo**@webdos.co mwrote in message
news:11******** **************@ a75g2000cwd.goo glegroups.com.. .

Three noob questions. Please help.

1. Is there a way to have arguments on subroutine that are optional?

Use the optional keyword I believe.

2. Say I need to convert datetime to string..in this format :
2006-09-07 23:00:00.000

datef.tostring( )

produces:

'1/1/0001 12:00:00 AM'

I need it to produce something like this:

2006-09-07 23:00:00.000

I know you can do something like this:

.datef.ToString ("MM\-dd\-yy")

Yes.

3. I want to pass a subroutine an argument that might be type string or
might be type datetime.. how can I do this and then use it's value
accordingingly? type Object maybe?

Either object or define the function twice with each parameter type. This is
called overloading.

Michael

[Armin Zingler]

"jobs" <jo**@webdos.co mschrieb

Three noob questions. Please help.

1. Is there a way to have arguments on subroutine that are optional?

See "Optional" keyword and "procedure overloading" in VB documentation.

2. Say I need to convert datetime to string..in this format :
2006-09-07 23:00:00.000

datef.tostring( )

produces:

'1/1/0001 12:00:00 AM'

I need it to produce something like this:

2006-09-07 23:00:00.000

I know you can do something like this:

.datef.ToString ("MM\-dd\-yy")

Use the format string that you need. See ToString documentation for details.
In your code, put the cursor on 'ToString' and press F1.

3. I want to pass a subroutine an argument that might be type string
or might be type datetime.. how can I do this and then use it's
value accordingingly? type Object maybe?

Write two procedures: Same name but different data types (different
signature). This is called overloading.

sub bla(byval x as string)
end sub

sub bla(byval x as date)
end sub
Armin

[Tom Shelton]

On 2007-01-23, jobs <jo**@webdos.co mwrote:

Three noob questions. Please help.

1. Is there a way to have arguments on subroutine that are optional?

Yes - using the Optional keyword. But, may I suggest that you NOT use this
technique in any publicly accessible methods. In those cases, you should
really use the ability of VB.NET to allow overloading... Ex:

Public Class ExampleClass
Public Sub DoCoolStuff ()
' Do Cool Stuff With No Arguments
' A lot of times, you would just call one
' of the other overloads with a default value
Me.DoCoolStuff (100)
End Sub

Public Sub DoCoolStuff (ByVal i As Integer)
' Do Cool Stuff to i
End Sub
End Class

>

2. Say I need to convert datetime to string..in this format :
2006-09-07 23:00:00.000

datef.tostring( )

produces:

'1/1/0001 12:00:00 AM'

I need it to produce something like this:

2006-09-07 23:00:00.000

I know you can do something like this:

.datef.ToString ("MM\-dd\-yy")

Look up format strings in the documentation. Yes, you can do lot's of
different formats.

>
3. I want to pass a subroutine an argument that might be type string or
might be type datetime.. how can I do this and then use it's value
accordingingly? type Object maybe?

as a bad example to demonstrate the problem.

say..

Public Sub UpdateJob(ByVal field as string, ByVal Value As Object)

I would overload it :)

Public Sub UpdateJob (ByVal field As String, ByVal Value As DateTime)
Public Sub UpdateJob (ByVal field As String, ByVal Value As String)

Now you don't have to worry - the compiler will call the right one.

--
Tom Shelton

[jobs]

Thank you for all responses. Very good!