Hi,
how can I create an instance (object) of a class (form) if I only know the
classname (VB.NET 1.0)?
I need to do this in a complex app where jobs consist of parts. Each part's
data is saved in a separate database table. For the parts, the form's class
name is saved in a data table, so that I know which form to use. As this is
a string, I need to be able to create the form by it's name (like
CreateObject() does for COM objects).
--
Any help gladly appreciated!
Rene Mansveld
Spider IT - Germany www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o) 6  2444 
take a look at the Activator.Creat eInstance method in the System.Reflecti on
namespace.
hope that helps..
Imran.
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . Hi,
how can I create an instance (object) of a class (form) if I only know the
classname (VB.NET 1.0)?
I need to do this in a complex app where jobs consist of parts. Each
part's
data is saved in a separate database table. For the parts, the form's
class
name is saved in a data table, so that I know which form to use. As this
is
a string, I need to be able to create the form by it's name (like
CreateObject() does for COM objects).
--
Any help gladly appreciated!
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
Thanks for the quick answer!
Unfortunately I couldn't get this to work, and according to the help, this
will create an instance of a Type.
I tried the Activator.Creat eInstance(Nothi ng, "Auftrag") call, but I got
this exception:
A non handled exception of type 'System.TypeLoa dException' occured in
mscorlib.dll.
Extra info: The type Auftrag in the assembly ..., Version=0.3.178 3.15723,
Culture=neutral , PublicKeyToken= null could not be loaded.
(translated from german)
Any ideas anyone?
--
Rene Mansveld
Spider IT - Germany www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Imran Koradia" <no****@microso ft.com> schrieb im Newsbeitrag
news:uH******** ******@TK2MSFTN GP12.phx.gbl... take a look at the Activator.Creat eInstance method in the
System.Reflecti on namespace.
hope that helps..
Imran.
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . Hi,
how can I create an instance (object) of a class (form) if I only know
the classname (VB.NET 1.0)?
I need to do this in a complex app where jobs consist of parts. Each
part's
data is saved in a separate database table. For the parts, the form's
class
name is saved in a data table, so that I know which form to use. As this
is
a string, I need to be able to create the form by it's name (like
CreateObject() does for COM objects).
--
Any help gladly appreciated!
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
It's solved now!
I got an answer from the german newsgroup from Jürgen Luhr which did it.
It is done through Reflexion:
'<deklaration code>
Imports System.Reflexio n
'<routine code>
Dim t As Type = Type.GetType("< Namespace>.<Cla ss>")
Dim c As ConstructorInfo = t.GetConstructo r(Type.EmptyTyp es)
Dim o As Object = c.Invoke(Nothin g)
'Now o holds the instance of the class
--
Hope this helps ...
Rene Mansveld
Spider IT - Germany www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> schrieb im Newsbeitrag
news:Op******** ******@TK2MSFTN GP12.phx.gbl... Thanks for the quick answer!
Unfortunately I couldn't get this to work, and according to the help, this
will create an instance of a Type.
I tried the Activator.Creat eInstance(Nothi ng, "Auftrag") call, but I got
this exception:
A non handled exception of type 'System.TypeLoa dException' occured in
mscorlib.dll.
Extra info: The type Auftrag in the assembly ..., Version=0.3.178 3.15723,
Culture=neutral , PublicKeyToken= null could not be loaded.
(translated from german)
Any ideas anyone?
--
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Imran Koradia" <no****@microso ft.com> schrieb im Newsbeitrag
news:uH******** ******@TK2MSFTN GP12.phx.gbl... take a look at the Activator.Creat eInstance method in the
System.Reflecti on namespace.
hope that helps..
Imran.
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. . Hi,
how can I create an instance (object) of a class (form) if I only know the classname (VB.NET 1.0)?
I need to do this in a complex app where jobs consist of parts. Each
part's
data is saved in a separate database table. For the parts, the form's
class
name is saved in a data table, so that I know which form to use. As
this is
a string, I need to be able to create the form by it's name (like
CreateObject() does for COM objects).
--
Any help gladly appreciated!
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
Correction: Reflexion should be Reflection ;o)
--
Hope this helps ...
Rene Mansveld
Spider IT - Germany www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> schrieb im Newsbeitrag
news:uC******** *****@TK2MSFTNG P11.phx.gbl... It's solved now!
I got an answer from the german newsgroup from Jürgen Luhr which did it.
It is done through Reflexion:
'<deklaration code>
Imports System.Reflexio n
'<routine code>
Dim t As Type = Type.GetType("< Namespace>.<Cla ss>")
Dim c As ConstructorInfo = t.GetConstructo r(Type.EmptyTyp es)
Dim o As Object = c.Invoke(Nothin g)
'Now o holds the instance of the class
--
Hope this helps ...
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> schrieb im
Newsbeitrag news:Op******** ******@TK2MSFTN GP12.phx.gbl... Thanks for the quick answer!
Unfortunately I couldn't get this to work, and according to the help,
this will create an instance of a Type.
I tried the Activator.Creat eInstance(Nothi ng, "Auftrag") call, but I got
this exception:
A non handled exception of type 'System.TypeLoa dException' occured in
mscorlib.dll.
Extra info: The type Auftrag in the assembly ...,
Version=0.3.178 3.15723, Culture=neutral , PublicKeyToken= null could not be loaded.
(translated from german)
Any ideas anyone?
--
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Imran Koradia" <no****@microso ft.com> schrieb im Newsbeitrag
news:uH******** ******@TK2MSFTN GP12.phx.gbl... take a look at the Activator.Creat eInstance method in the
System.Reflecti on namespace.
hope that helps..
Imran.
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. .
> Hi,
>
> how can I create an instance (object) of a class (form) if I only
know the > classname (VB.NET 1.0)?
> I need to do this in a complex app where jobs consist of parts. Each
> part's
> data is saved in a separate database table. For the parts, the
form's > class
> name is saved in a data table, so that I know which form to use. As
this > is
> a string, I need to be able to create the form by it's name (like
> CreateObject() does for COM objects).
>
> --
> Any help gladly appreciated!
>
> Rene Mansveld
> Spider IT - Germany
> www.Spider-IT.de / www.Spider-IT.net
>
> Please reply to the newsgroup(s) :o)
>
>
Well - its the same with Activator.Creat eInstance. You get the type object
from the namespace and class name and pass in the type object to the method:
Dim t As Type = Type.GetType("< Namespace>.<Cla ss>")
Dim frm As Object = Activator.Creat eInstance(t)
DirectCast(frm, Form).Show()
Imran.
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> wrote in message
news:uC******** *****@TK2MSFTNG P11.phx.gbl... It's solved now!
I got an answer from the german newsgroup from Jürgen Luhr which did it.
It is done through Reflexion:
'<deklaration code>
Imports System.Reflexio n
'<routine code>
Dim t As Type = Type.GetType("< Namespace>.<Cla ss>")
Dim c As ConstructorInfo = t.GetConstructo r(Type.EmptyTyp es)
Dim o As Object = c.Invoke(Nothin g)
'Now o holds the instance of the class
--
Hope this helps ...
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> schrieb im
Newsbeitrag news:Op******** ******@TK2MSFTN GP12.phx.gbl... Thanks for the quick answer!
Unfortunately I couldn't get this to work, and according to the help,
this will create an instance of a Type.
I tried the Activator.Creat eInstance(Nothi ng, "Auftrag") call, but I got
this exception:
A non handled exception of type 'System.TypeLoa dException' occured in
mscorlib.dll.
Extra info: The type Auftrag in the assembly ...,
Version=0.3.178 3.15723, Culture=neutral , PublicKeyToken= null could not be loaded.
(translated from german)
Any ideas anyone?
--
Rene Mansveld
Spider IT - Germany
www.Spider-IT.de / www.Spider-IT.net
Please reply to the newsgroup(s) :o)
"Imran Koradia" <no****@microso ft.com> schrieb im Newsbeitrag
news:uH******** ******@TK2MSFTN GP12.phx.gbl... take a look at the Activator.Creat eInstance method in the
System.Reflecti on namespace.
hope that helps..
Imran.
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> wrote in message
news:%2******** *******@TK2MSFT NGP11.phx.gbl.. .
> Hi,
>
> how can I create an instance (object) of a class (form) if I only
know the > classname (VB.NET 1.0)?
> I need to do this in a complex app where jobs consist of parts. Each
> part's
> data is saved in a separate database table. For the parts, the
form's > class
> name is saved in a data table, so that I know which form to use. As
this > is
> a string, I need to be able to create the form by it's name (like
> CreateObject() does for COM objects).
>
> --
> Any help gladly appreciated!
>
> Rene Mansveld
> Spider IT - Germany
> www.Spider-IT.de / www.Spider-IT.net
>
> Please reply to the newsgroup(s) :o)
>
>
"Rene Mansveld" <R.********@TAK ETHISOUT.Spider-IT.de> schrieb: how can I create an instance (object) of a class (form) if I only know the
classname (VB.NET 1.0)?
\\\
Private Function CreateClassByNa me( _
ByVal PartialAssembly Name As String, _
ByVal QualifiedClassN ame As String _
) As Object
Return _
Activator.Creat eInstance( _
[Assembly].LoadWithPartia lName( _
PartialAssembly Name _
).GetType(Quali fiedClassName) _
)
End Function
///
--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://dotnet.mvps.org/dotnet/faqs/> This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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