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Assembly.CreateInstance

I'm using Assembly.CreateInstance (3rd overload) to create an instance of one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object CreateInstanceImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo, System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in C:\Mis Documentos\Proyectos de Visual Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much
Nov 15 '05 #1
7 11991
Osvaldo,

I am curious, why are you not using Activator.CreateInstance? It looks
like you want to use Assembly.CreateInstance so that you can pass parameters
to the constructor, which you can do in an easier manner with
Activator.CreateInstance.

You probably want to use the following combination of flags:

BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:eP**************@TK2MSFTNGP09.phx.gbl...
I'm using Assembly.CreateInstance (3rd overload) to create an instance of
one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object CreateInstanceImpl(System.Reflection.BindingFlags,
System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo,
System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder
binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean
ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args,
CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in
C:\Mis Documentos\Proyectos de Visual
Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much
Nov 15 '05 #2
It's a little complex. The type I want to instanciate is allocated in an
assembly not referenced in my application. So I receive an Assembly variable
with reflection info inside.
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> escribió
en el mensaje news:Oh**************@tk2msftngp13.phx.gbl...
Osvaldo,

I am curious, why are you not using Activator.CreateInstance? It looks like you want to use Assembly.CreateInstance so that you can pass parameters to the constructor, which you can do in an easier manner with
Activator.CreateInstance.

You probably want to use the following combination of flags:

BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:eP**************@TK2MSFTNGP09.phx.gbl...
I'm using Assembly.CreateInstance (3rd overload) to create an instance of
one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object CreateInstanceImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo, System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean
ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args,
CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in
C:\Mis Documentos\Proyectos de Visual
Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much

Nov 15 '05 #3
May the force be with you Nicholas .... :)

I see a reflection friend in you... it's good to know...
Thanks very much guy, you've really helped me

Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> escribió en el mensaje news:Oh**************@tk2msftngp13.phx.gbl...
Osvaldo,

I am curious, why are you not using Activator.CreateInstance? It looks
like you want to use Assembly.CreateInstance so that you can pass parameters
to the constructor, which you can do in an easier manner with
Activator.CreateInstance.

You probably want to use the following combination of flags:

BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:eP**************@TK2MSFTNGP09.phx.gbl...
I'm using Assembly.CreateInstance (3rd overload) to create an instance of
one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object CreateInstanceImpl(System.Reflection.BindingFlags,
System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo,
System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder
binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean
ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args,
CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in
C:\Mis Documentos\Proyectos de Visual
Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much



Nov 15 '05 #4
On 11/5/2003 3:02 PM, Osvaldo Bisignano wrote:
It's a little complex. The type I want to instanciate is allocated in an
assembly not referenced in my application. So I receive an Assembly variable
with reflection info inside.


Could you please send the code you use when you invoke
Assembly.CreateInstance(...) ? How do you create this assembly object?
Is the type you want to instantiate public?

regards
Bogdan

Nov 15 '05 #5
Osvaldo,

Does that mean it worked? =)

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...
May the force be with you Nicholas .... :)

I see a reflection friend in you... it's good to know...
Thanks very much guy, you've really helped me

Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> escribió en el
mensaje news:Oh**************@tk2msftngp13.phx.gbl...
Osvaldo,

I am curious, why are you not using Activator.CreateInstance? It looks like you want to use Assembly.CreateInstance so that you can pass parameters to the constructor, which you can do in an easier manner with
Activator.CreateInstance.

You probably want to use the following combination of flags:

BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:eP**************@TK2MSFTNGP09.phx.gbl...
I'm using Assembly.CreateInstance (3rd overload) to create an instance of
one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object CreateInstanceImpl(System.Reflection.BindingFlags, System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo, System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean
ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args,
CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in
C:\Mis Documentos\Proyectos de Visual
Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much

Nov 15 '05 #6
I'ts important to note that if your constructor has optional parameters (thing, I Know, shoudn't be done) you have to pass an object array with same number of elements as constructor's parameters in the args() parameters of CreateInstance
"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> escribió en el mensaje news:Oh**************@tk2msftngp13.phx.gbl...
Osvaldo,

I am curious, why are you not using Activator.CreateInstance? It looks
like you want to use Assembly.CreateInstance so that you can pass parameters
to the constructor, which you can do in an easier manner with
Activator.CreateInstance.

You probably want to use the following combination of flags:

BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:eP**************@TK2MSFTNGP09.phx.gbl...
I'm using Assembly.CreateInstance (3rd overload) to create an instance of
one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object CreateInstanceImpl(System.Reflection.BindingFlags,
System.Reflection.Binder, System.Object[], System.Globalization.CultureInfo,
System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr, Binder
binder, Object[] args, CultureInfo culture, Object[] activationAttributes)
at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr,
Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean
ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args,
CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in
C:\Mis Documentos\Proyectos de Visual
Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much



Nov 15 '05 #7
of course...

thank you

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> escribió
en el mensaje news:uv**************@tk2msftngp13.phx.gbl...
Osvaldo,

Does that mean it worked? =)

--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:%2****************@TK2MSFTNGP10.phx.gbl...
May the force be with you Nicholas .... :)

I see a reflection friend in you... it's good to know...
Thanks very much guy, you've really helped me

Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> escribió en el
mensaje news:Oh**************@tk2msftngp13.phx.gbl...
Osvaldo,

I am curious, why are you not using Activator.CreateInstance? It

looks
like you want to use Assembly.CreateInstance so that you can pass

parameters
to the constructor, which you can do in an easier manner with
Activator.CreateInstance.

You probably want to use the following combination of flags:

BindingFlags.CreateInstance | BindingFlags.Instance | BindingFlags.Public
Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Osvaldo Bisignano" <va*************@yahoo.com.ar> wrote in message
news:eP**************@TK2MSFTNGP09.phx.gbl...
I'm using Assembly.CreateInstance (3rd overload) to create an instance of one of the types included on that dll.
But what the hell are the bindingflags? I get this exception:

MissingMethodException
Constructor not Found on class ...

Source: mscorlib
TargetSite:System.Object

CreateInstanceImpl(System.Reflection.BindingFlags,
System.Reflection.Binder, System.Object[],

System.Globalization.CultureInfo,
System.Object[])
STACKTRACE:
at System.RuntimeType.CreateInstanceImpl(BindingFlags bindingAttr,

Binder
binder, Object[] args, CultureInfo culture, Object[] activationAttributes) at System.Activator.CreateInstance(Type type, BindingFlags bindingAttr, Binder binder, Object[] args, CultureInfo culture, Object[]
activationAttributes)
at System.Reflection.Assembly.CreateInstance(String typeName, Boolean
ignoreCase, BindingFlags bindingAttr, Binder binder, Object[] args,
CultureInfo culture, Object[] activationAttributes)
at Legion.Comun.frmABM.EjecutarComandoDeMenu(ComandoE num Comando) in
C:\Mis Documentos\Proyectos de Visual
Studio\Local\Legion\Legion.Comun\frmABM.vb:line 324

I only want to access the default constructor.

Thanks very much


Nov 15 '05 #8

This thread has been closed and replies have been disabled. Please start a new discussion.

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