ArrayList as a Property type

[Just Me]

This doesn't work. I guess New is needed someplace but I don't know where?



Public Property Filters() As ArrayList

Get

Filters.Add(cboFilter.Text)

---snip--

Thanks in advance for any info

 

[Ken Tucker [MVP]]

Hi,

Store a local copy of the arraylist to return in the property.



Public Property Filters as ArrayList

Get
Dim marFilters as New Arraylist
marFilters.Add(cboFilter.text)
return marFilters
end get


Ken
-----------------------
This doesn't work. I guess New is needed someplace but I don't know where?



Public Property Filters() As ArrayList

Get

Filters.Add(cboFilter.Text)

---snip--

Thanks in advance for any info

 

[Guest]

August 10, 2004

The property does not maintain an instance of ArrayList itself.
You also have the concept of the property wrong. What you should
do is create a page level variable of ArrayList and then create a
sub that you call to add a filter. Then if you want to retrieve the
filters,
just access the arraylist variable directly. This looks something like:

dim filters as new ArrayList

Private Sub AddFilter()
filters.add(cbofilter.text)
End Sub

Private Sub Button1_Click(....)
if filters(0) = "Something" then
.... ' do something with list
End Sub

A property is maintained by something like this:

dim _userinput as string

Public Property UserInput() as String
Get
return _userinput
End Get
Set (byval value as string)
_userinput = value
End Set
End Property

Then you can use the property like this: Class.Userinput = Something.
I hope this makes sense! Have a good day!


Joseph MCP

 

[Guest]

August 10, 2004

Wouldn't the marFilters go out of scope in your example?
Also, to only have a Get statement, the property declaration
must be marked as ReadOnly. That also looks suspiciously like
a function...

Joseph MCP

 

[Just Me]

Seems to work for me
Thanks

 

[Just Me]

Can someone confirm this??
The reference variable would go out of scope but the instance would not get
GC since there would still be a reference in the return.

 

[Just Me]

Thanks for the reply. It's getting late and I'm not too sharp but I'm having
a problem following your reply.

In a sense I already have a class level variable with the data in it (for
Get); or into which I want to put the data (with Set)
It is a combobox. The property is to get that data or set it.
With that said, do you still think what you wrote applies?

Thanks

 

[Herfried K. Wagner [MVP]]

This doesn't work. I guess New is needed someplace but I don't know where?



Public Property Filters() As ArrayList

Get

Filters.Add(cboFilter.Text)

\\\
Private m_Filters As New ArrayList()

Public Property Filters() As ArrayList
Get
Return m_Filters
End Get
Set(ByVal Value As ArrayList)
m_Filters = Value
End Set
End Property
///

 

[Guest]

August 10, 2004

I sounds like you already were doing the equivilant of what I wrote,
so the answer is no. But now you have me confused of what the problem
is? Maybe I just need to review the posts again. Good job!


Joseph MCP

 

[Guest]

August 10, 2004

By the way, in reviewing the posts, I don't think you have the property
concept wrong. You've got it right. I was more in the mind-set of
functions,
as I didn't see the full code. Good job!


Joseph MCP

 

[Just Me]

Thanks for spending so much time

August 10, 2004

By the way, in reviewing the posts, I don't think you have the property
concept wrong. You've got it right. I was more in the mind-set of
functions,
as I didn't see the full code. Good job!


Joseph MCP

 

[Just Me]

Thanks

I remember someone asking what the Return was for.
At the time I thought it was just another way to proceed but I guess it's
more than that.