Adding New References at Runtime...

[Juande]

Hello,

My application needs load some dll's at runtime, Is there any way to do it?,
can you show me a working example code?

Many thanks

[Herfried K. Wagner [MVP]]

Re: Adding New References at Runtime...

"Juande" <a@b.com> schrieb:[color=blue]
> My application needs load some dll's at runtime, Is there any way to do
> it?[/color]

Take a look at the documentation for 'System.Reflect ion.Assembly.Lo ad*'.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Juande]

Re: Adding New References at Runtime...

Ok thanks,

Now other question please, I have the next code;

Dim Form1 As Form
Form1 =
System.Reflecti on.Assembly.Loa dFrom("MyDLL.dl l").CreateInsta nce("MyDLL.Form 2")
Form1.Show()

How can I check if any dll is still loaded?

Many thanks

"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> escribió en el mensaje
news:OdkhuBcZFH A.2128@TK2MSFTN GP14.phx.gbl...[color=blue]
> "Juande" <a@b.com> schrieb:[color=green]
>> My application needs load some dll's at runtime, Is there any way to do
>> it?[/color]
>
> Take a look at the documentation for 'System.Reflect ion.Assembly.Lo ad*'.
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>[/color]

[Herfried K. Wagner [MVP]]

Re: Adding New References at Runtime...

"Juande" <a@b.com> schrieb:[color=blue]
> Dim Form1 As Form
> Form1 =
> System.Reflecti on.Assembly.Loa dFrom("MyDLL.dl l").CreateInsta nce("MyDLL.Form 2")
> Form1.Show()
>
> How can I check if any dll is still loaded?[/color]

The DLL will remain loaded until the appdomain that loaded the DLL and/or
obtained type information from the DLL will be released. If you want to
unload a DLL, you'll have to work with a secondary appdomain and remote
interfaces:

<URL:http://www.west-wind.com/presentations/DynamicCode/DynamicCode.htm >
-> "Understand ing how .Net loads code"

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Cor Ligthert]

Re: Adding New References at Runtime...

Juande,

I am curious, how were you able to produce this question in such a short
time, did you really investigate this as Herfried sugested?

Cor

[Juande]

Re: Adding New References at Runtime...

Ok,

I have a large C/S Application (sometimes crashes/quits unexpectedly without
any error), I want to divide in modules (dll) and then load the needed ones,
so I've realized a simply application test to load an example dll to check
System.Reflecti on.Assembly to see how it works, the next step will be check
if the dll is still loaded to doesn't load again.

Herfried; Many thanks for your very quick and useful help.

"Cor Ligthert" <notmyfirstname @planet.nl> escribió en el mensaje
news:%2318WgfcZ FHA.2124@TK2MSF TNGP14.phx.gbl. ..[color=blue]
> Juande,
>
> I am curious, how were you able to produce this question in such a short
> time, did you really investigate this as Herfried sugested?
>
> Cor
>[/color]

[Juande]

Re: Adding New References at Runtime...

Sorry, but I've got another problem, as you know, I load at runtime my dll,
this dll contains a class called MyForm, example code on a click button
event;

Dim MyDLL As [Assembly]
MyDLL = System.Reflecti on.Assembly.Loa dFrom("MyDLL.dl l")
Dim MyForm As Form
MyForm = MyDLL.CreateIns tance("MyDLL.My Form")
MyForm.Show()

This code works fine, but, I want to prevent that if the form is loaded,
doesn't load other instance, How can I do it?

Many thanks in advance

"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> escribió en el mensaje
news:OdkhuBcZFH A.2128@TK2MSFTN GP14.phx.gbl...[color=blue]
> "Juande" <a@b.com> schrieb:[color=green]
>> My application needs load some dll's at runtime, Is there any way to do
>> it?[/color]
>
> Take a look at the documentation for 'System.Reflect ion.Assembly.Lo ad*'.
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>[/color]

[Herfried K. Wagner [MVP]]

Re: Adding New References at Runtime...

"Juande" <a@b.com> schrieb:[color=blue]
> Sorry, but I've got another problem, as you know, I load at runtime my
> dll, this dll contains a class called MyForm, example code on a click
> button event;
>
> Dim MyDLL As [Assembly]
> MyDLL = System.Reflecti on.Assembly.Loa dFrom("MyDLL.dl l")
> Dim MyForm As Form
> MyForm = MyDLL.CreateIns tance("MyDLL.My Form")
> MyForm.Show()
>
> This code works fine, but, I want to prevent that if the form is loaded,
> doesn't load other instance, How can I do it?[/color]

\\\
Private m_MyForm As Form
..
..
..
If MyForm Is Nothing Then
MyForm = MyDll.CreateIns tance(...)
Else
MsgBox("Form already instantiated!")
End If
///

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Juande]

Re: Adding New References at Runtime...

Herfried thanks for your great patience,

When close MyForm and then I want to load it again, it's already
instantiated and doesn't show, in some place of my code when from is closing
I must to set MyForm = nothing, but where?

Thanks

"Herfried K. Wagner [MVP]" <hirf-spam-me-here@gmx.at> escribió en el mensaje
news:e88%23ivfZ FHA.3280@TK2MSF TNGP09.phx.gbl. ..[color=blue]
> "Juande" <a@b.com> schrieb:[color=green]
>> Sorry, but I've got another problem, as you know, I load at runtime my
>> dll, this dll contains a class called MyForm, example code on a click
>> button event;
>>
>> Dim MyDLL As [Assembly]
>> MyDLL = System.Reflecti on.Assembly.Loa dFrom("MyDLL.dl l")
>> Dim MyForm As Form
>> MyForm = MyDLL.CreateIns tance("MyDLL.My Form")
>> MyForm.Show()
>>
>> This code works fine, but, I want to prevent that if the form is loaded,
>> doesn't load other instance, How can I do it?[/color]
>
> \\\
> Private m_MyForm As Form
> .
> .
> .
> If MyForm Is Nothing Then
> MyForm = MyDll.CreateIns tance(...)
> Else
> MsgBox("Form already instantiated!")
> End If
> ///
>
> --
> M S Herfried K. Wagner
> M V P <URL:http://dotnet.mvps.org/>
> V B <URL:http://classicvb.org/petition/>[/color]

[Herfried K. Wagner [MVP]]

Re: Adding New References at Runtime...

"Juande" <a@b.com> schrieb:[color=blue]
> When close MyForm and then I want to load it again, it's already
> instantiated and doesn't show, in some place of my code when from is
> closing I must to set MyForm = nothing, but where?[/color]

You may want to add a handler to the form's 'Closed' event using
'AddHandler' and set the variable to 'Nothing' there.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>

[Juande]

Re: Adding New References at Runtime...

Hello Herfried,

Finally I got to dispose the instance of MyForm with AddHandler and
RemoveHandler, thanks to you.
But, every time that I do something about this, problems come to me. The
next question is; How can I access to the methods, functions or variables
declared into 'MyForm'.

One more time, many thanks

[Herfried K. Wagner [MVP]]

Re: Adding New References at Runtime...

"Juande" <a@b.com> schrieb:[color=blue]
> Finally I got to dispose the instance of MyForm with AddHandler and
> RemoveHandler, thanks to you.
> But, every time that I do something about this, problems come to me. The
> next question is; How can I access to the methods, functions or variables
> declared into 'MyForm'.[/color]

Direct access to the members would require type information to be available
at compile-time, for example, an interface which defines the methods the
class implements or a design-time reference. Otherwise you'll have to use
reflection (namespace 'System.Reflect ion') or 'CallByName' to call methods
on the objects.

--
M S Herfried K. Wagner
M V P <URL:http://dotnet.mvps.org/>
V B <URL:http://classicvb.org/petition/>