Reflection and Dynamic Methods

[Ron]

I have a situation where I have an object name as a string, and a method as
a string. I need to construct a click handler with those two bits of
information. This is what I came up with so far... and the error message I
am receiving...

Assembly assem = Assembly.GetExe cutingAssembly( );
string currentNamespac e =
Assembly.GetExe cutingAssembly( ).GetTypes()[0].Namespace;
Type type = assem.GetType(c urrentNamespace + "." + m_FormName, true, true);
MethodInfo methinf = type.GetMethod( MethodCall);
m_ButtonControl .Click += new CommandEventHan dler(methinf);

Error 1 'methinf' is a 'variable' but is used like a 'method'

Thanks,
Ron

[Paul E Collins]

Re: Reflection and Dynamic Methods

"Ron" <rs_herhuth@yah oo.comwrote:

m_ButtonControl .Click += new CommandEventHan dler(methinf);
Error 1 'methinf' is a 'variable' but is used like a 'method'

I'm not sure what CommandEventHan dler is, but this way works for me in
Windows Forms:

MethodInfo methinf = type.GetMethod( "NameOfMethod") ;
theButton.Click += new EventHandler(Me thodCall);

Eq.

[Paul E Collins]

Re: Reflection and Dynamic Methods

Oh, ignore the previous post. I made a mistake.

Eq.

[Ignacio Machin ( .NET/ C# MVP )]

Re: Reflection and Dynamic Methods

On Apr 16, 1:35 pm, "Paul E Collins" <find_my_real_a ddr...@CL4.org>
wrote:

"Ron" <rs_herh...@yah oo.comwrote:

m_ButtonControl .Click += new CommandEventHan dler(methinf);
Error 1 'methinf' is a 'variable' but is used like a 'method'

>
I'm not sure what CommandEventHan dler is, but this way works for me in
Windows Forms:

It's a delegate, to be used in the onCommand event in web controls

[Ignacio Machin ( .NET/ C# MVP )]

Re: Reflection and Dynamic Methods

On Apr 16, 12:58 pm, "Ron" <rs_herh...@yah oo.comwrote:

I have a situation where I have an object name as a string, and a method as
a string.  I need to construct a click handler with those two bits of
information.  This is what I came up with so far... and the error message I
am receiving...
>
Assembly assem = Assembly.GetExe cutingAssembly( );
string currentNamespac e =
Assembly.GetExe cutingAssembly( ).GetTypes()[0].Namespace;
Type type = assem.GetType(c urrentNamespace + "." +  m_FormName, true, true);
MethodInfo methinf = type.GetMethod( MethodCall);
m_ButtonControl .Click += new CommandEventHan dler(methinf);
>
Error 1 'methinf' is a 'variable' but is used like a 'method'
>
Thanks,
Ron

Hi,

Take a look at this code:
string targetMethodNam e = "yourmethod ";
string eventName = "eventName" ;

//Hook the event.
System.Reflecti on.EventInfo evClick =
c.GetType().Get Event(eventName );
Type tDelegate = evClick.EventHa ndlerType;
Delegate d = Delegate.Create Delegate(tDeleg ate,
Field.ContentPr ovider, targetMethodNam e);
System.Reflecti on.MethodInfo addHandler =
evClick.GetAddM ethod();
Object[] addHandlerArgs = { d };
addHandler.Invo ke(c, addHandlerArgs) ;

[Ron]

Re: Reflection and Dynamic Methods

Ignacio,

Good Stuff!

One question: What is Field.ContentPr ovider?

I'm getting an ArgumentExcepti on : Error Binding to target method on this
line:
Delegate d = Delegate.Create Delegate(tDeleg ate, methinf);

Thanks!
Ron

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin @gmail.comwrote in
message
news:f7a55ec9-77af-4b61-8c01-b1e86dfa5fce@e6 7g2000hsa.googl egroups.com...
On Apr 16, 12:58 pm, "Ron" <rs_herh...@yah oo.comwrote:

I have a situation where I have an object name as a string, and a method
as
a string. I need to construct a click handler with those two bits of
information. This is what I came up with so far... and the error message I
am receiving...
>
Assembly assem = Assembly.GetExe cutingAssembly( );
string currentNamespac e =
Assembly.GetExe cutingAssembly( ).GetTypes()[0].Namespace;
Type type = assem.GetType(c urrentNamespace + "." + m_FormName, true,
true);
MethodInfo methinf = type.GetMethod( MethodCall);
m_ButtonControl .Click += new CommandEventHan dler(methinf);
>
Error 1 'methinf' is a 'variable' but is used like a 'method'
>
Thanks,
Ron

Hi,

Take a look at this code:
string targetMethodNam e = "yourmethod ";
string eventName = "eventName" ;

//Hook the event.
System.Reflecti on.EventInfo evClick =
c.GetType().Get Event(eventName );
Type tDelegate = evClick.EventHa ndlerType;
Delegate d = Delegate.Create Delegate(tDeleg ate,
Field.ContentPr ovider, targetMethodNam e);
System.Reflecti on.MethodInfo addHandler =
evClick.GetAddM ethod();
Object[] addHandlerArgs = { d };
addHandler.Invo ke(c, addHandlerArgs) ;

[Ignacio Machin ( .NET/ C# MVP )]

Re: Reflection and Dynamic Methods

On Apr 16, 2:14 pm, "Ron" <rs_herh...@yah oo.comwrote:

Ignacio,
>
Good Stuff!
>
One question: What is Field.ContentPr ovider?
>

Sorry, that is part of my code :) , take a look at
Delegate.Create Delegate method to know the parameter expected there,
and replace it with your value, IIRC it's the instance object that
will be hooked to tha event

[Ron]

Re: Reflection and Dynamic Methods


I checked out the documentation and its even less clear :-)

The Form that the method is in is called frmTest.

I tried Delegate d = Delegate.Create Delegate(tDeleg ate,frmTest,met hinf);

and I get an Error binding to target method on that line.

Ron


"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin @gmail.comwrote in
message
news:2ef741ee-0b56-49dd-97ee-4a1fb7d77c01@26 g2000hsk.google groups.com...
On Apr 16, 2:14 pm, "Ron" <rs_herh...@yah oo.comwrote:

Ignacio,
>
Good Stuff!
>
One question: What is Field.ContentPr ovider?
>

Sorry, that is part of my code :) , take a look at
Delegate.Create Delegate method to know the parameter expected there,
and replace it with your value, IIRC it's the instance object that
will be hooked to tha event

[Ignacio Machin ( .NET/ C# MVP )]

Re: Reflection and Dynamic Methods

On Apr 16, 3:39 pm, "Ron" <rs_herh...@yah oo.comwrote:

I checked out the documentation and its even less clear :-)
>
The Form that the method is in is called frmTest.
>
I tried  Delegate d = Delegate.Create Delegate(tDeleg ate,frmTest,met hinf);

It's easy , my code use this overload:
Delegate.Create Delegate (Type, Object, String)

As you see, the first parameter is a Type instance, that I created in
the line above
Type tDelegate = evClick.EventHa ndlerType;

The second parameter is the instance of the class that will handle the
event ( in your case would be an isntance of the frmTest)
and finally the last parameter is the name of the method (its a member
of frmTest)

[Ron]

Re: Reflection and Dynamic Methods

Ignacio,

Im Still getting the problem... here is my code:

public Janus.Windows.R ibbon.ButtonCom mand CreateButton()
{
m_ButtonControl = new Janus.Windows.R ibbon.ButtonCom mand();
m_ButtonControl .Text = m_ButtonText;
if (m_ImageName.Tr im().Length 0)
{
m_ButtonControl .LargeImage =
(Image)rm.GetOb ject(m_ImageNam e);
}
Assembly assem = Assembly.GetExe cutingAssembly( );
string currentNamespac e =
Assembly.GetExe cutingAssembly( ).GetTypes()[0].Namespace;
Type type = assem.GetType(c urrentNamespace + "." + m_FormName,
true, true);


MethodInfo methinf = type.GetMethod( MethodCall);

System.Reflecti on.EventInfo evClick =
m_ButtonControl .GetType().GetE vent("Click");
Type tDelegate = evClick.EventHa ndlerType;
Delegate d = Delegate.Create Delegate(tDeleg ate, type,
MethodCall);
System.Reflecti on.MethodInfo addHandler =
evClick.GetAddM ethod();
Object[] addHandlerArgs = { d };
//addHandler.Invo ke(c, addHandlerArgs) ;

return m_ButtonControl ;
}


"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin @gmail.comwrote in
message
news:a0495ded-6466-4142-9f02-aba2fe9a9aa1@l2 8g2000prd.googl egroups.com...
On Apr 16, 3:39 pm, "Ron" <rs_herh...@yah oo.comwrote:

I checked out the documentation and its even less clear :-)
>
The Form that the method is in is called frmTest.
>
I tried Delegate d = Delegate.Create Delegate(tDeleg ate,frmTest,met hinf);

It's easy , my code use this overload:
Delegate.Create Delegate (Type, Object, String)

As you see, the first parameter is a Type instance, that I created in
the line above
Type tDelegate = evClick.EventHa ndlerType;

The second parameter is the instance of the class that will handle the
event ( in your case would be an isntance of the frmTest)
and finally the last parameter is the name of the method (its a member
of frmTest)

[Ignacio Machin ( .NET/ C# MVP )]

Re: Reflection and Dynamic Methods

On Apr 16, 4:47 pm, "Ron" <rs_herh...@yah oo.comwrote:

Ignacio,
>
Im Still getting the problem... here is my code:

What error are you getting now?
It should be different than the first ime