Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
regards
ludy 14 18519
buddy,
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
Cor
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
>
Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
regards
ludy
Hi Cor
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
Public class myClass
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
Function2(myArraylist.Item(0))
.......
.......
.......
Function2(myClass )
-------------------
I get exception when i call Function2 inside Function1 even after
DirectCast
Cor Ligthert [MVP] wrote:
buddy,
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
Cor
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
regards
ludy
Hello budy_ludy,
What Exception exactly?
-Boo
Hi Cor
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
Public class myClass
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
Function2(myArraylist.Item(0))
......
......
......
Function2(myClass )
-------------------
I get exception when i call Function2 inside Function1 even after
DirectCast
Cor Ligthert [MVP] wrote:
>buddy,
You mean something as \\\ dim myObject is myClass myArraylist.Add(myObject) DirectCast(myArrayList(0),myClass).WhatEver /// I hope this helps, Cor
"budy_ludy" <se*******@gmail.comschreef in bericht news:11**********************@i42g2000cwa.googleg roups.com...
>>Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it, and later i want to retrieve each ArrayList items and type cast to the class, How can it be done ? I used CType for casting but it is throwing exception. regards ludy
Try this (I think this is what you meant).
Public class myClass
....
End Class
Function1()
Dim myObject as myClass
myArraylist.Add(myObject)
dim myFunctionReturn as boolean
myFunctionReturn = Function2(DirectCast(myArraylist.Item(0), myclass))
......
End Function
Function2(myVariable as myClass ) as boolean
End Function
-------------------
--
Dennis in Houston
"budy_ludy" wrote:
Hi Cor
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
Public class myClass
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
Function2(myArraylist.Item(0))
.......
.......
.......
Function2(myClass )
-------------------
I get exception when i call Function2 inside Function1 even after
DirectCast
Cor Ligthert [MVP] wrote:
buddy,
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
Cor
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
>
Hi All,
>
I am new to vb .net,
>
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
>
>
regards
ludy
>
Hi,
sorry if i have not communicated properly earlier,
Exact situation,
C#
I have a Library created in C# and it has a class myClass(only integers
and strings),
i store the objects in ArrayList.
VB
i call the Library in VB and it returns me the ArrayList(items of
myClass objects),
i retrieve the first element and typecast it to myClass, which has the
same definition in
both vb and c# (the class has only integers and string as elements and
no methods)
Same class definition in vb and c#(library)
now at the point when i try to type cast ArrayList element to myClass
in vb, it gives me below exception,
----------------------------
Unable to cast object of type Library.myClass to type myClass
When casting from a number, the value must be a number less than
infinity
Make sure the source type is convertible to the destination type
----------------------------
i tried both DirectCast and also CType but it gives me exception
any other alternative, if it is not possible to communicate class from
c# library to vb ?
Dennis wrote:
Try this (I think this is what you meant).
Public class myClass
....
End Class
Function1()
Dim myObject as myClass
myArraylist.Add(myObject)
dim myFunctionReturn as boolean
myFunctionReturn = Function2(DirectCast(myArraylist.Item(0), myclass))
......
End Function
Function2(myVariable as myClass ) as boolean
End Function
-------------------
--
Dennis in Houston
"budy_ludy" wrote:
Hi Cor
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
Public class myClass
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
Function2(myArraylist.Item(0))
.......
.......
.......
Function2(myClass )
-------------------
I get exception when i call Function2 inside Function1 even after
DirectCast
Cor Ligthert [MVP] wrote:
buddy,
>
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
>
Cor
>
>
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
regards
ludy
budy_ludy,
In your VB project, is your myClass object dimensioned as a new instance of
Library.myClass?
Or do you have 2 classes: Library.myClass and another myClass defined in
your VB project?
Kerry Moorman
"budy_ludy" wrote:
Hi,
sorry if i have not communicated properly earlier,
Exact situation,
C#
I have a Library created in C# and it has a class myClass(only integers
and strings),
i store the objects in ArrayList.
VB
i call the Library in VB and it returns me the ArrayList(items of
myClass objects),
i retrieve the first element and typecast it to myClass, which has the
same definition in
both vb and c# (the class has only integers and string as elements and
no methods)
Same class definition in vb and c#(library)
now at the point when i try to type cast ArrayList element to myClass
in vb, it gives me below exception,
----------------------------
Unable to cast object of type Library.myClass to type myClass
When casting from a number, the value must be a number less than
infinity
Make sure the source type is convertible to the destination type
----------------------------
i tried both DirectCast and also CType but it gives me exception
any other alternative, if it is not possible to communicate class from
c# library to vb ?
Dennis wrote:
Try this (I think this is what you meant).
Public class myClass
....
End Class
Function1()
Dim myObject as myClass
myArraylist.Add(myObject)
dim myFunctionReturn as boolean
myFunctionReturn = Function2(DirectCast(myArraylist.Item(0), myclass))
......
End Function
Function2(myVariable as myClass ) as boolean
End Function
-------------------
--
Dennis in Houston
"budy_ludy" wrote:
Hi Cor
>
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
>
>
Public class myClass
>
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
>
Function2(myArraylist.Item(0))
.......
.......
.......
>
>
Function2(myClass )
-------------------
>
I get exception when i call Function2 inside Function1 even after
DirectCast
>
>
>
>
Cor Ligthert [MVP] wrote:
buddy,
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
Cor
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
>
Hi All,
>
I am new to vb .net,
>
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
>
>
regards
ludy
>
>
>
Hi Kerry Moorman ,
i have a scenario like this,
.......
vb
----
ArrayList inarray,outarray
outarray = LibraryFunction(inarray)
vbobject = new myClass
vbobject.Function1( DirectCast(outarray.Item(0), myClass) )
and now i understood that there is one function, Function1 in myClass
of vb,
and the same function i have not defined in c#.
In vb i call the Function1 and pass the items from ArrayList,
and i get exception when i call Function1 ,
should i have a dummy function1 in c# library class ?
Kerry Moorman wrote:
budy_ludy,
In your VB project, is your myClass object dimensioned as a new instance of
Library.myClass?
Or do you have 2 classes: Library.myClass and another myClass defined in
your VB project?
Kerry Moorman
"budy_ludy" wrote:
Hi,
sorry if i have not communicated properly earlier,
Exact situation,
C#
I have a Library created in C# and it has a class myClass(only integers
and strings),
i store the objects in ArrayList.
VB
i call the Library in VB and it returns me the ArrayList(items of
myClass objects),
i retrieve the first element and typecast it to myClass, which has the
same definition in
both vb and c# (the class has only integers and string as elements and
no methods)
Same class definition in vb and c#(library)
now at the point when i try to type cast ArrayList element to myClass
in vb, it gives me below exception,
----------------------------
Unable to cast object of type Library.myClass to type myClass
When casting from a number, the value must be a number less than
infinity
Make sure the source type is convertible to the destination type
----------------------------
i tried both DirectCast and also CType but it gives me exception
any other alternative, if it is not possible to communicate class from
c# library to vb ?
Dennis wrote:
Try this (I think this is what you meant).
>
Public class myClass
....
End Class
>
Function1()
Dim myObject as myClass
myArraylist.Add(myObject)
dim myFunctionReturn as boolean
myFunctionReturn = Function2(DirectCast(myArraylist.Item(0), myclass))
......
End Function
>
Function2(myVariable as myClass ) as boolean
>
End Function
-------------------
>
--
Dennis in Houston
>
>
"budy_ludy" wrote:
>
Hi Cor
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
Public class myClass
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
Function2(myArraylist.Item(0))
.......
.......
.......
Function2(myClass )
-------------------
I get exception when i call Function2 inside Function1 even after
DirectCast
Cor Ligthert [MVP] wrote:
buddy,
>
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
>
Cor
>
>
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
regards
ludy
budy_ludy wrote:
vb
----
ArrayList inarray,outarray
outarray = LibraryFunction(inarray)
vbobject = new myClass
vbobject.Function1( DirectCast(outarray.Item(0), myClass) )
and now i understood that there is one function, Function1 in myClass
of vb,
and the same function i have not defined in c#.
In vb i call the Function1 and pass the items from ArrayList,
and i get exception when i call Function1 ,
should i have a dummy function1 in c# library class ?
You have TWO classes? Once in a .vb file in your vb project and
another defined in a .dll written in C#? Is that correct?
If so, then you can't do that. Even if your class in VB was identical
to the class in C#, they are still considered different types by the
runtime and you cannot cast between them.
Just use the class in the C# library and don't try to duplicate it in
VB and you should be ok.
Chris
Chris Dunaway,
which means i cannot cast a c# class to vb class even though they share
same structure,
ok got it,
Chris Dunaway wrote:
budy_ludy wrote:
vb
----
ArrayList inarray,outarray
outarray = LibraryFunction(inarray)
vbobject = new myClass
vbobject.Function1( DirectCast(outarray.Item(0), myClass) )
and now i understood that there is one function, Function1 in myClass
of vb,
and the same function i have not defined in c#.
In vb i call the Function1 and pass the items from ArrayList,
and i get exception when i call Function1 ,
should i have a dummy function1 in c# library class ?
You have TWO classes? Once in a .vb file in your vb project and
another defined in a .dll written in C#? Is that correct?
If so, then you can't do that. Even if your class in VB was identical
to the class in C#, they are still considered different types by the
runtime and you cannot cast between them.
Just use the class in the C# library and don't try to duplicate it in
VB and you should be ok.
Chris
Well, umm, yeah, that is correct I guess.
However, I think you're missing the point: *Any* class you create in C# is
perfectly usuable from VB and vice versa. If you defined myClass in your C#
project then use that class from your VB project. Don't create a new class
with the same name. A class is never the same as another class even though
they might have the same name.
/claes
"budy_ludy" <se*******@gmail.comwrote in message
news:11**********************@e3g2000cwe.googlegro ups.com...
>
Chris Dunaway,
which means i cannot cast a c# class to vb class even though they share
same structure,
ok got it,
budy_ludy wrote:
Chris Dunaway,
which means i cannot cast a c# class to vb class even though they share
same structure,
Exactly. Just use the C# class and add the function that you need to
that or if you need it in VB or cannot alter the C# class, then in your
VB class, just inherit from the C# class then you can add your function
in VB plus you will be able to cast from the C# class to the VB class.
ok got the point, i will reuse the vb class in c# and from the c#
library i will return the class object and in vb i will type cast the
returned arraylist item to vb class.
Thank you to all.
Chris Dunaway wrote:
budy_ludy wrote:
Chris Dunaway,
which means i cannot cast a c# class to vb class even though they share
same structure,
Exactly. Just use the C# class and add the function that you need to
that or if you need it in VB or cannot alter the C# class, then in your
VB class, just inherit from the C# class then you can add your function
in VB plus you will be able to cast from the C# class to the VB class.
budy,
I don't see the problem as long as you have set a reference to your C# class
and that is correct CLS compliant written.
Than the code should be the same as in my first message.
The only thing is that in that I have used Whatever, because I don't know
what properties/methods you have in that C# class.
I hope this helps,
Cor
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11*********************@e3g2000cwe.googlegrou ps.com...
Hi,
sorry if i have not communicated properly earlier,
Exact situation,
C#
I have a Library created in C# and it has a class myClass(only integers
and strings),
i store the objects in ArrayList.
VB
i call the Library in VB and it returns me the ArrayList(items of
myClass objects),
i retrieve the first element and typecast it to myClass, which has the
same definition in
both vb and c# (the class has only integers and string as elements and
no methods)
Same class definition in vb and c#(library)
now at the point when i try to type cast ArrayList element to myClass
in vb, it gives me below exception,
----------------------------
Unable to cast object of type Library.myClass to type myClass
When casting from a number, the value must be a number less than
infinity
Make sure the source type is convertible to the destination type
----------------------------
i tried both DirectCast and also CType but it gives me exception
any other alternative, if it is not possible to communicate class from
c# library to vb ?
Dennis wrote:
>Try this (I think this is what you meant).
Public class myClass .... End Class
Function1() Dim myObject as myClass myArraylist.Add(myObject) dim myFunctionReturn as boolean myFunctionReturn = Function2(DirectCast(myArraylist.Item(0), myclass)) ...... End Function
Function2(myVariable as myClass ) as boolean
End Function
-------------------
-- Dennis in Houston
"budy_ludy" wrote:
Hi Cor
Below is the situation,
I am trying to pass the arraylist from function1 to the function2
which accepts class,
even if i type cast using Direct cast i get exception.
Public class myClass
Function1()
-----------
dim myObject is myClass
myArraylist.Add(myObject)
Function2(myArraylist.Item(0))
.......
.......
.......
Function2(myClass )
-------------------
I get exception when i call Function2 inside Function1 even after
DirectCast
Cor Ligthert [MVP] wrote:
buddy,
You mean something as
\\\
dim myObject is myClass
myArraylist.Add(myObject)
DirectCast(myArrayList(0),myClass).WhatEver
///
I hope this helps,
Cor
"budy_ludy" <se*******@gmail.comschreef in bericht
news:11**********************@i42g2000cwa.googlegr oups.com...
Hi All,
I am new to vb .net,
I have an ArrayList and i store class objects in it,
and later i want to retrieve each ArrayList items and type cast to
the
class,
How can it be done ?
I used CType for casting but it is throwing exception.
regards
ludy
| Same class definition in vb and c#(library)
Ah! There's the rub
The "class definition" should only be in one language/library either VB or
C#.
Although they may have similar layouts, they are distinct as the CLR uses
assembly, version, namespace & type name to identify a type. Seeing as the
VB class is in a VB assembly & the C# class is in a C# assembly the runtime
will consider them distinct types.
One of the major benefits of .NET is its interoperability in that you can
define the class once in C#, then use that class definition all your want in
VB and visa versa. Provided the class is CLS compliant....
--
Hope this helps
Jay B. Harlow [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley - http://www.tsbradley.net
"budy_ludy" <se*******@gmail.comwrote in message
news:11*********************@e3g2000cwe.googlegrou ps.com...
| Hi,
|
| sorry if i have not communicated properly earlier,
|
| Exact situation,
|
| C#
| I have a Library created in C# and it has a class myClass(only integers
| and strings),
| i store the objects in ArrayList.
|
| VB
| i call the Library in VB and it returns me the ArrayList(items of
| myClass objects),
| i retrieve the first element and typecast it to myClass, which has the
| same definition in
| both vb and c# (the class has only integers and string as elements and
| no methods)
| Same class definition in vb and c#(library)
|
| now at the point when i try to type cast ArrayList element to myClass
| in vb, it gives me below exception,
| ----------------------------
| Unable to cast object of type Library.myClass to type myClass
|
| When casting from a number, the value must be a number less than
| infinity
|
| Make sure the source type is convertible to the destination type
|
| ----------------------------
|
| i tried both DirectCast and also CType but it gives me exception
|
| any other alternative, if it is not possible to communicate class from
| c# library to vb ?
|
|
|
|
|
| Dennis wrote:
| Try this (I think this is what you meant).
| >
| Public class myClass
| ....
| End Class
| >
| Function1()
| Dim myObject as myClass
| myArraylist.Add(myObject)
| dim myFunctionReturn as boolean
| myFunctionReturn = Function2(DirectCast(myArraylist.Item(0),
myclass))
| ......
| End Function
| >
| Function2(myVariable as myClass ) as boolean
| >
| End Function
| -------------------
| >
| --
| Dennis in Houston
| >
| >
| "budy_ludy" wrote:
| >
| Hi Cor
|
| Below is the situation,
| I am trying to pass the arraylist from function1 to the function2
| which accepts class,
| even if i type cast using Direct cast i get exception.
|
|
| Public class myClass
|
| Function1()
| -----------
| dim myObject is myClass
| myArraylist.Add(myObject)
|
| Function2(myArraylist.Item(0))
| .......
| .......
| .......
|
|
| Function2(myClass )
| -------------------
|
| I get exception when i call Function2 inside Function1 even after
| DirectCast
|
|
|
|
| Cor Ligthert [MVP] wrote:
| buddy,
| >
| You mean something as
| \\\
| dim myObject is myClass
| myArraylist.Add(myObject)
| DirectCast(myArrayList(0),myClass).WhatEver
| ///
| I hope this helps,
| >
| Cor
| >
| >
| "budy_ludy" <se*******@gmail.comschreef in bericht
| news:11**********************@i42g2000cwa.googlegr oups.com...
|
| Hi All,
|
| I am new to vb .net,
|
| I have an ArrayList and i store class objects in it,
| and later i want to retrieve each ArrayList items and type cast to
the
| class,
| How can it be done ?
| I used CType for casting but it is throwing exception.
|
|
| regards
| ludy
|
|
|
| This discussion thread is closed Replies have been disabled for this discussion. Similar topics
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