How do you use GetProperty.SetValue with the index parameter?

[dig_dug_d]

Hello,

I have been struggling with the SetValue method when trying to use
indexed items. I can't figure out what needs to be done to create
the "index As Object()" parameter. Juding from the lack of examples
out there on the net I am sure many people would love to see how this
mysterious parameter works in a real example. Anyone?

Thanks in advance,
Doug

[coolCoder]

On Nov 22, 2:22 am, dig_dug_d <[e-mail]:

Hello,

I have been struggling with the SetValue method when trying to use
indexed items. I can't figure out what needs to be done to create
the "index As Object()" parameter. Juding from the lack of examples
out there on the net I am sure many people would love to see how this
mysterious parameter works in a real example. Anyone?

Thanks in advance,
Doug

Hi Doug,
If I am not mistaken, you must be talking with respect to
setting property values using Reflection ? If it is so, you can use
the following syntax to set a value for the property

ctl.GetType().InvokeMember(strProperty, BindingFlags.SetProperty,
Nothing, ctl, New Object() {strControlResource})

I will explain you all the things in this statement.

ctl - Control object. You can replace this with whatever you want, but
having the GetType() method.
InvokeMember is called to set a named property to some value provided.
strProperty - Name of the property to be set. For example - Text
BindingFlags.SetProperty denotes that we need to set the property.
the last parameter is of special interest now, since it is the actual
value that would be set to the property. Here I have created an Object
array on fly containing the only item strControlResource.

Hope this helps.
If I have misunderstood your question please revert back with relevant
details, so that I may help you.
Thanks,
coolCoder.

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[Andrew Morton]

dig_dug_d wrote:

I do need to use reflection.. as my controls are being created
dynamically.

You can assign an .ID to them when they are created, then use that ID to
figure out which control sent an event.

Andrew

[dig_dug_d]

Thanks for the reply,

I'm sorry I got this off on a tangent..the example I gave was only to
frame the question "how do use the index parameter of the SetValue
method". I appreciate the help.. but there is this crazy parameter
that no one seems to know how to use and it seems others have asked..
but I have yet to find a good example on how this aspect of the method
works. I really do appreciate all the help and time people spend
replying... and if I ever do find the answer I will most certainly
post it.

Thanks,
Doug

On Nov 22, 9:19 am, "Andrew Morton" <[e-mail]>
wrote:

dig_dug_d wrote:

I do need to use reflection.. as my controls are being created
dynamically.

You can assign an .ID to them when they are created, then use that ID to
figure out which control sent an event.

Andrew

[Phill W.]

dig_dug_d wrote:

I do need to use reflection as my controls are being created
dynamically.

No you don't.

/If/ you know the name of a control then you can use FindControl to find
it and manipulate it.

Even if you /don't/ know the name of the control you want (and I'm
slightly puzzled as to why you wouldn't) you can iterate through the
page's Controls collection and recursively down through each "container"
control to find a control that you're interested in.

Having found one, you can /ask/ that Control what Type it is ...

If TypeOf ctl Is ListBox Then
. . .

.... and, if it's one you want, you can cast it to the correct Type and
manipulate it as required.

/None/ of the above requires Reflection.

IMHO, you must know /something/ about these controls; how can you work
with them otherwise? It's like blindfolding a Vet and asking him to
perform surgery on an unknown animal.

HTH,
Phill W.

[Armin Zingler]

"dig_dug_d" <do***********@gmail.comschrieb

Thanks for the reply,

I'm sorry I got this off on a tangent..the example I gave was only
to frame the question "how do use the index parameter of the
SetValue method". I appreciate the help.. but there is this crazy
parameter that no one seems to know how to use and it seems others
have asked.. but I have yet to find a good example on how this
aspect of the method works. I really do appreciate all the help and
time people spend replying... and if I ever do find the answer I
will most certainly post it.

I don't find a Selected property with the Listbox control, neither Winforms,
nor Webforms.

I fail to see the problem. Indexed properties are properties with arguments,
for example

o.p(17) = 12

or

o.p(17, 24) = 12
So:

Private Class C
Public Property P(_
ByVal arg1 As Integer, ByVal arg2 As Integer) As Integer
Get

End Get
Set(ByVal value As Integer)
MsgBox(arg1 & " " & arg2)
End Set
End Property
End Class

Usage:
Dim o As New C
Dim Args(1) As Object

Args(0) = 17
Args(1) = 24

o.GetType.GetProperty("P").SetValue(o, 17, Args)

Armin