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Using Type Class

I have a class named "myclass" and an arraylist containing elements of type
"MyClass". I want to get the value of a property of "MyClass" (a string
type) for one of the arraylist elements.

I can get this using:
dim b as string
b = DirectCast(myar raylist(0),mycl ass).myproperty

However, I want to use an object to define the type "MyClass" like:
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty

but I get a "c" type not defined. How can I do this?

Thanks for any help.
--
Dennis in Houston
Nov 21 '05 #1
16 1907
"Dennis" <De****@discuss ions.microsoft. com> schrieb:
I have a class named "myclass" and an arraylist
containing elements of type "MyClass".
Notice that 'MyClass' is a keyword in the VB.NET programming language.
I want to get the value of a property of "MyClass" (a string
type) for one of the arraylist elements.

I can get this using:
dim b as string
b = DirectCast(myar raylist(0),mycl ass).myproperty

However, I want to use an object to define the type "MyClass" like:
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty


\\\
If TypeOf myarraylist(0) Is Foo Then
b = DirectCast(myar raylist(0), Foo).MyProperty
ElseIf...Then
...
....
End If
///

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>
Nov 21 '05 #2
Dennis,

I cannot offer you much, however this will work
\\\
Public Class Example
Public Shared Sub Main()
Dim myarraylist As New ArrayList
Dim mywhatever As New WindowsApplicat ion1.myclass
myarraylist.Add (mywhatever)
Dim b As String = DirectCast(myar raylist(0), _
WindowsApplicat ion1.myclass).m yproperty
If TypeOf myarraylist(0) Is WindowsApplicat ion1.myclass Then
MessageBox.Show (DirectCast(mya rraylist(0), _
WindowsApplicat ion1.myclass).m yproperty)
End If
End Sub
End Class
Public Class [myclass]
Public myproperty As String
Public Sub New()
myproperty = "Hello World"
End Sub
End Class
///

I would not use that myclass because it is very confusing because it is a
keyword in VBNet.
(And I used an very easy way for a property only to keep it short)

I hope this helps anyway a little bit?

Cor

"Dennis" <De****@discuss ions.microsoft. com>
..
I have a class named "myclass" and an arraylist containing elements of type
"MyClass". I want to get the value of a property of "MyClass" (a string
type) for one of the arraylist elements.

I can get this using:
dim b as string
b = DirectCast(myar raylist(0),mycl ass).myproperty

However, I want to use an object to define the type "MyClass" like:
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty

but I get a "c" type not defined. How can I do this?

Thanks for any help.
--
Dennis in Houston

Nov 21 '05 #3
Dennis,
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty
You cannot cast based on a Type variable, the DirectCast needs the name
(myclass) of the type at compile time.

If you truly want to get AnyProperty form an ArrayList of AnyClass, the
"easist" way is to use CallByName

Dim o As Object = CallByName(list (0), "MyProperty ", CallType.Get)
Alternatively I will use a PropertyDescrip tor or Reflection.

Something like:

Dim properties As System.Componen tModel.Property DescriptorColle ction
properties =
System.Componen tModel.TypeDesc riptor.GetPrope rties(list(0))

Dim o As Object = properties("MyP roperty").GetVa lue(list(0))

However I normally only use PropertyDescrip tor in more advanced cases...

Hope this helps
Jay

"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:1F******** *************** ***********@mic rosoft.com...I have a class named "myclass" and an arraylist containing elements of type
"MyClass". I want to get the value of a property of "MyClass" (a string
type) for one of the arraylist elements.

I can get this using:
dim b as string
b = DirectCast(myar raylist(0),mycl ass).myproperty

However, I want to use an object to define the type "MyClass" like:
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty

but I get a "c" type not defined. How can I do this?

Thanks for any help.
--
Dennis in Houston

Nov 21 '05 #4
Thanks Jay and Cor. I was thinking about the CallbyName but I didn't know it
would work with a general arraylist of classes. Following is what I ended up
with that will sort any arraylist of classes (must be same class types) by
any string or integer or decimal property of the class in ascending or
descending order:

dim myArrayList as ArrayList
'Set each element of the ArrayList to any class (must all be of same type)
Dim mycomparer As New mycompare

mycomparer.prop ertyname = col
mycomparer.asce nding = True
myArrayList.Sor t(mycomparer)
.......
.......
_______________ _______________ _______________ _______________ ______
Protected Class mycompare
Implements IComparer
Public propertyname As String
Public ascending As Boolean
Private Function Compare(ByVal x As Object, ByVal y As Object) As Integer
_ Implements IComparer.Compa re
If ascending Then
Return New CaseInsensitive Comparer().Comp are(CallByName( x, _
propertyname, CallType.Get), CallByName(y, propertyname, _ CallType.Get))
Else
Return New CaseInsensitive Comparer().Comp are(CallByName( y, _
propertyname, CallType.Get), CallByName(x, propertyname, _ CallType.Get))
End If
End Function
End Class
_______________ _______________ _______________ _______________ ___

"Jay B. Harlow [MVP - Outlook]" wrote:
Dennis,
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty


You cannot cast based on a Type variable, the DirectCast needs the name
(myclass) of the type at compile time.

If you truly want to get AnyProperty form an ArrayList of AnyClass, the
"easist" way is to use CallByName

Dim o As Object = CallByName(list (0), "MyProperty ", CallType.Get)
Alternatively I will use a PropertyDescrip tor or Reflection.

Something like:

Dim properties As System.Componen tModel.Property DescriptorColle ction
properties =
System.Componen tModel.TypeDesc riptor.GetPrope rties(list(0))

Dim o As Object = properties("MyP roperty").GetVa lue(list(0))

However I normally only use PropertyDescrip tor in more advanced cases...

Hope this helps
Jay

"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:1F******** *************** ***********@mic rosoft.com...
I have a class named "myclass" and an arraylist containing elements of type
"MyClass". I want to get the value of a property of "MyClass" (a string
type) for one of the arraylist elements.

I can get this using:
dim b as string
b = DirectCast(myar raylist(0),mycl ass).myproperty

However, I want to use an object to define the type "MyClass" like:
dim C as type = type.GetType(my arraylist(0))
b = DirectCast(myar raylist(0), C ).MyProperty

but I get a "c" type not defined. How can I do this?

Thanks for any help.
--
Dennis in Houston


Nov 21 '05 #5
Dennis,
Actually your code will work on two objects of different types as long as
they have the same property names.

For example, your class will compare the these two classes without any
problems:

Public Class Class1

Public ReadOnly Property Test() As String
...

End Class

Public Class Class2

Public ReadOnly Property Test() As String
...

End Class

Jay
"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:E1******** *************** ***********@mic rosoft.com...
Thanks Jay and Cor. I was thinking about the CallbyName but I didn't know
it
would work with a general arraylist of classes. Following is what I ended
up
with that will sort any arraylist of classes (must be same class types) by
any string or integer or decimal property of the class in ascending or
descending order:

dim myArrayList as ArrayList
'Set each element of the ArrayList to any class (must all be of same type)
Dim mycomparer As New mycompare

mycomparer.prop ertyname = col
mycomparer.asce nding = True
myArrayList.Sor t(mycomparer)
.......
.......
_______________ _______________ _______________ _______________ ______
Protected Class mycompare
Implements IComparer
Public propertyname As String
Public ascending As Boolean
Private Function Compare(ByVal x As Object, ByVal y As Object) As
Integer
_ Implements IComparer.Compa re
If ascending Then
Return New CaseInsensitive Comparer().Comp are(CallByName( x, _
propertyname, CallType.Get), CallByName(y, propertyname, _ CallType.Get))
Else
Return New CaseInsensitive Comparer().Comp are(CallByName( y, _
propertyname, CallType.Get), CallByName(x, propertyname, _ CallType.Get))
End If
End Function
End Class
_______________ _______________ _______________ _______________ ___

"Jay B. Harlow [MVP - Outlook]" wrote:
Dennis,
> dim C as type = type.GetType(my arraylist(0))
> b = DirectCast(myar raylist(0), C ).MyProperty


You cannot cast based on a Type variable, the DirectCast needs the name
(myclass) of the type at compile time.

If you truly want to get AnyProperty form an ArrayList of AnyClass, the
"easist" way is to use CallByName

Dim o As Object = CallByName(list (0), "MyProperty ", CallType.Get)
Alternatively I will use a PropertyDescrip tor or Reflection.

Something like:

Dim properties As
System.Componen tModel.Property DescriptorColle ction
properties =
System.Componen tModel.TypeDesc riptor.GetPrope rties(list(0))

Dim o As Object = properties("MyP roperty").GetVa lue(list(0))

However I normally only use PropertyDescrip tor in more advanced cases...

Hope this helps
Jay

"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:1F******** *************** ***********@mic rosoft.com...
>I have a class named "myclass" and an arraylist containing elements of
>type
> "MyClass". I want to get the value of a property of "MyClass" (a
> string
> type) for one of the arraylist elements.
>
> I can get this using:
> dim b as string
> b = DirectCast(myar raylist(0),mycl ass).myproperty
>
> However, I want to use an object to define the type "MyClass" like:
> dim C as type = type.GetType(my arraylist(0))
> b = DirectCast(myar raylist(0), C ).MyProperty
>
> but I get a "c" type not defined. How can I do this?
>
> Thanks for any help.
>
>
> --
> Dennis in Houston


Nov 21 '05 #6
You are, of course as usual, correct. I was just trying to simpify my
explaination. The major drawback, I think, is speed. I probably would be
faster to use the object with properties directly and use late binding rather
than CallbyName. But anyway, it's pretty fast for small arraylists, arrays,
etc. Thanks again for your help.

"Jay B. Harlow [MVP - Outlook]" wrote:
Dennis,
Actually your code will work on two objects of different types as long as
they have the same property names.

For example, your class will compare the these two classes without any
problems:

Public Class Class1

Public ReadOnly Property Test() As String
...

End Class

Public Class Class2

Public ReadOnly Property Test() As String
...

End Class

Jay
"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:E1******** *************** ***********@mic rosoft.com...
Thanks Jay and Cor. I was thinking about the CallbyName but I didn't know
it
would work with a general arraylist of classes. Following is what I ended
up
with that will sort any arraylist of classes (must be same class types) by
any string or integer or decimal property of the class in ascending or
descending order:

dim myArrayList as ArrayList
'Set each element of the ArrayList to any class (must all be of same type)
Dim mycomparer As New mycompare

mycomparer.prop ertyname = col
mycomparer.asce nding = True
myArrayList.Sor t(mycomparer)
.......
.......
_______________ _______________ _______________ _______________ ______
Protected Class mycompare
Implements IComparer
Public propertyname As String
Public ascending As Boolean
Private Function Compare(ByVal x As Object, ByVal y As Object) As
Integer
_ Implements IComparer.Compa re
If ascending Then
Return New CaseInsensitive Comparer().Comp are(CallByName( x, _
propertyname, CallType.Get), CallByName(y, propertyname, _ CallType.Get))
Else
Return New CaseInsensitive Comparer().Comp are(CallByName( y, _
propertyname, CallType.Get), CallByName(x, propertyname, _ CallType.Get))
End If
End Function
End Class
_______________ _______________ _______________ _______________ ___

"Jay B. Harlow [MVP - Outlook]" wrote:
Dennis,
> dim C as type = type.GetType(my arraylist(0))
> b = DirectCast(myar raylist(0), C ).MyProperty

You cannot cast based on a Type variable, the DirectCast needs the name
(myclass) of the type at compile time.

If you truly want to get AnyProperty form an ArrayList of AnyClass, the
"easist" way is to use CallByName

Dim o As Object = CallByName(list (0), "MyProperty ", CallType.Get)
Alternatively I will use a PropertyDescrip tor or Reflection.

Something like:

Dim properties As
System.Componen tModel.Property DescriptorColle ction
properties =
System.Componen tModel.TypeDesc riptor.GetPrope rties(list(0))

Dim o As Object = properties("MyP roperty").GetVa lue(list(0))

However I normally only use PropertyDescrip tor in more advanced cases...

Hope this helps
Jay

"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:1F******** *************** ***********@mic rosoft.com...
>I have a class named "myclass" and an arraylist containing elements of
>type
> "MyClass". I want to get the value of a property of "MyClass" (a
> string
> type) for one of the arraylist elements.
>
> I can get this using:
> dim b as string
> b = DirectCast(myar raylist(0),mycl ass).myproperty
>
> However, I want to use an object to define the type "MyClass" like:
> dim C as type = type.GetType(my arraylist(0))
> b = DirectCast(myar raylist(0), C ).MyProperty
>
> but I get a "c" type not defined. How can I do this?
>
> Thanks for any help.
>
>
> --
> Dennis in Houston


Nov 21 '05 #7
Dennis,
The major drawback, I think, is speed. Which is where I would consider using a PropertyDescrip tor instead of
CallByName in this case...

Something like:

Protected Class mycompare
Implements IComparer

Private ReadOnly m_property As
System.Componen tModel.Property Descriptor
Private ReadOnly m_ascending As Boolean

Public Sub New(ByVal componentType As Type, ByVal propertyName As
String, ByVal ascending As Boolean)
Dim properties As
System.Componen tModel.Property DescriptorColle ction
properties =
System.Componen tModel.TypeDesc riptor.GetPrope rties(component Type)
m_property = properties(prop ertyName)
m_ascending = ascending
End Sub

Private Function Compare(ByVal x As Object, ByVal y As Object) As
Integer Implements IComparer.Compa re
x = m_property.GetV alue(x)
y = m_property.GetV alue(y)
If m_ascending Then
Return New CaseInsensitive Comparer().Comp are(x, y)
Else
Return New CaseInsensitive Comparer().Comp are(y, x)
End If
End Function

End Class
>> > dim C as type = type.GetType(my arraylist(0)) Dim mycomparer as new mycombare(C, col, True) > myArrayList.Sor t(mycomparer)


Hope this helps
Jay

"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:71******** *************** ***********@mic rosoft.com... You are, of course as usual, correct. I was just trying to simpify my
explaination. The major drawback, I think, is speed. I probably would be
faster to use the object with properties directly and use late binding
rather
than CallbyName. But anyway, it's pretty fast for small arraylists,
arrays,
etc. Thanks again for your help.

"Jay B. Harlow [MVP - Outlook]" wrote:
Dennis,
Actually your code will work on two objects of different types as long as
they have the same property names.

For example, your class will compare the these two classes without any
problems:

Public Class Class1

Public ReadOnly Property Test() As String
...

End Class

Public Class Class2

Public ReadOnly Property Test() As String
...

End Class

Jay
"Dennis" <De****@discuss ions.microsoft. com> wrote in message
news:E1******** *************** ***********@mic rosoft.com...
> Thanks Jay and Cor. I was thinking about the CallbyName but I didn't
> know
> it
> would work with a general arraylist of classes. Following is what I
> ended
> up
> with that will sort any arraylist of classes (must be same class types)
> by
> any string or integer or decimal property of the class in ascending or
> descending order:
>
> dim myArrayList as ArrayList
> 'Set each element of the ArrayList to any class (must all be of same
> type)
> Dim mycomparer As New mycompare
>
> mycomparer.prop ertyname = col
> mycomparer.asce nding = True
> myArrayList.Sor t(mycomparer)
> .......
> .......
> _______________ _______________ _______________ _______________ ______
> Protected Class mycompare
> Implements IComparer
> Public propertyname As String
> Public ascending As Boolean
> Private Function Compare(ByVal x As Object, ByVal y As Object) As
> Integer
> _ Implements IComparer.Compa re
> If ascending Then
> Return New CaseInsensitive Comparer().Comp are(CallByName( x, _
> propertyname, CallType.Get), CallByName(y, propertyname, _
> CallType.Get))
> Else
> Return New CaseInsensitive Comparer().Comp are(CallByName( y, _
> propertyname, CallType.Get), CallByName(x, propertyname, _
> CallType.Get))
> End If
> End Function
> End Class
> _______________ _______________ _______________ _______________ ___
>
> "Jay B. Harlow [MVP - Outlook]" wrote:
>
>> Dennis,
>> > dim C as type = type.GetType(my arraylist(0))
>> > b = DirectCast(myar raylist(0), C ).MyProperty
>>
>> You cannot cast based on a Type variable, the DirectCast needs the
>> name
>> (myclass) of the type at compile time.
>>
>> If you truly want to get AnyProperty form an ArrayList of AnyClass,
>> the
>> "easist" way is to use CallByName
>>
>> Dim o As Object = CallByName(list (0), "MyProperty ", CallType.Get)
>>
>>
>> Alternatively I will use a PropertyDescrip tor or Reflection.
>>
>> Something like:
>>
>> Dim properties As
>> System.Componen tModel.Property DescriptorColle ction
>> properties =
>> System.Componen tModel.TypeDesc riptor.GetPrope rties(list(0))
>>
>> Dim o As Object = properties("MyP roperty").GetVa lue(list(0))
>>
>> However I normally only use PropertyDescrip tor in more advanced
>> cases...
>>
>> Hope this helps
>> Jay
>>
>> "Dennis" <De****@discuss ions.microsoft. com> wrote in message
>> news:1F******** *************** ***********@mic rosoft.com...
>> >I have a class named "myclass" and an arraylist containing elements
>> >of
>> >type
>> > "MyClass". I want to get the value of a property of "MyClass" (a
>> > string
>> > type) for one of the arraylist elements.
>> >
>> > I can get this using:
>> > dim b as string
>> > b = DirectCast(myar raylist(0),mycl ass).myproperty
>> >
>> > However, I want to use an object to define the type "MyClass" like:
>> > dim C as type = type.GetType(my arraylist(0))
>> > b = DirectCast(myar raylist(0), C ).MyProperty
>> >
>> > but I get a "c" type not defined. How can I do this?
>> >
>> > Thanks for any help.
>> >
>> >
>> > --
>> > Dennis in Houston
>>
>>
>>


Nov 21 '05 #8
Dennis,

I hope you saw that my example was early binding.

It depends how many classes you use however in my idea can it be an easy
approach.

I can me not immaging a situation where you do not know what kind of objects
you add to your arraylist so it should be as well be possible to collect
them in that way of my sample back.

(And than of course in a If ElseIf piece of code)

I hope this helps?

Cor
Nov 21 '05 #9
I am working on an application for my personal use that uses several
arraylists each of which has differing classes (some of which I haven't even
designed yet) and I want to use a class that inherits a DataGrid which sorts
on the click of a button by different properties (columns) in different
arraylists.

I can then click on the datagrid's column header and sort the arrarylists no
matter which arraylist to which the DataGrid is bound. It works great with
the CallByName but I read where this can be slow in a loop, of which, sorting
is a loop(s).

"Cor Ligthert" wrote:
Dennis,

I hope you saw that my example was early binding.

It depends how many classes you use however in my idea can it be an easy
approach.

I can me not immaging a situation where you do not know what kind of objects
you add to your arraylist so it should be as well be possible to collect
them in that way of my sample back.

(And than of course in a If ElseIf piece of code)

I hope this helps?

Cor

Nov 21 '05 #10

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In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth. The Art of Business Website Design Your website is...
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9020
tracyyun
by: tracyyun | last post by:
Dear forum friends, With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
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6636
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
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5948
by: conductexam | last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one. At the time of converting from word file to html my equations which are in the word document file was convert into image. Globals.ThisAddIn.Application.ActiveDocument.Select();...
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4726
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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3158
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system

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