"Jon Shemitz" <j**@midnightbeach.com> wrote in message
news:41F95452.767F0885@midnightbeach.com...
> ThunderMusic wrote:
>
>>     I have some code to load some plug-ins, but the code requires me to
>> know
>> the name of the class to load (here: SamplePlugin, derived from IPlugin)
>> :
>
>>         Assembly assembly = Assembly.LoadFrom ("myplugin.dll");
>>         Type t = assembly.GetType ("SamplePlugin");
>
>> The problem is, I don't want to have to know the name of the class I want
>> to
>> load...  I want to load the new module and get an instance of the class
>> that
>> derives IPlugin. Is there a way to do so?
>
>  foreach (Type Exported in assembly.GetExportedTypes())
>    if (Exported.IsClass && Exported.GetInterface("IPlugin", true) !=
> null)
>      ;
>
>
>
> --
>
> www.midnightbeach.com
"ThunderMusic" <NOdanylat@sympatico.caSPAMATALL> wrote in message
news:ueWuxEKBFHA.2676@TK2MSFTNGP12.phx.gbl...
> Hi,
>    I have some code to load some plug-ins, but the code requires me to
> know
> the name of the class to load (here: SamplePlugin, derived from IPlugin) :
>
> (Here is some C# code, but I use VB.Net to code my program)
> using System;
> using System.Reflection;
>
> public class Driver
> {
>    static void Main()
>    {
>        Assembly assembly = Assembly.LoadFrom ("myplugin.dll");
>        Type t = assembly.GetType ("SamplePlugin");
>        IPlugin plugin = (IPlugin) Activator.CreateInstance(t);
>        plugin.SayHello();
>    }
> }
>
> The problem is, I don't want to have to know the name of the class I want
> to
> load...  I want to load the new module and get an instance of the class
> that
> derives IPlugin. Is there a way to do so?
>
> In C++ for the same purpose, I had a win32 dll with an extern function
> that
> returned an instance of the contained class, so I loaded the dll, called
> the
> function and I was ready to proceed.  Is there something similar I can do
> with .NET class libraries?
>
> thanks
>
>
>

"Alan Seunarayan" <so0naz@ntlw0rld.c0m> a écrit dans le message de
news:ECT6e.20107$p71.676@newsfe3-gui.ntli.net...
> Hello,
>     I have 'played around' with using plugins and came across the same
> issue.  One way around is to create an attribute that can only be used one
> and only in a '[assembly:xxxx]' level.  The attribute constructor can take
a
> string for description and a string or a type for another.  Then when you
> load that assembly just look for your assembly-based attribute and you
will
> have an indication of the class that you can instantiate.  Also, in the
> construct of your attribute you could check that the type you pass it is
> compatible with your IPlugin interface.
>
> Hope this helps,  If you have any problems then drop me a line!
>
> Alan Seunarayan
>
> "Jon Shemitz" <j**@midnightbeach.com> wrote in message
> news:41F95452.767F0885@midnightbeach.com...
> > ThunderMusic wrote:
> >
> >>     I have some code to load some plug-ins, but the code requires me to
> >> know
> >> the name of the class to load (here: SamplePlugin, derived from
IPlugin)
> >> :
> >
> >>         Assembly assembly = Assembly.LoadFrom ("myplugin.dll");
> >>         Type t = assembly.GetType ("SamplePlugin");
> >
> >> The problem is, I don't want to have to know the name of the class I
want
> >> to
> >> load...  I want to load the new module and get an instance of the class
> >> that
> >> derives IPlugin. Is there a way to do so?
> >
> >  foreach (Type Exported in assembly.GetExportedTypes())
> >    if (Exported.IsClass && Exported.GetInterface("IPlugin", true) !=
> > null)
> >      ;
> >
> >
> >
> > --
> >
> > www.midnightbeach.com
> "ThunderMusic" <NOdanylat@sympatico.caSPAMATALL> wrote in message
> news:ueWuxEKBFHA.2676@TK2MSFTNGP12.phx.gbl...
> > Hi,
> >    I have some code to load some plug-ins, but the code requires me to
> > know
> > the name of the class to load (here: SamplePlugin, derived from IPlugin)
:
> >
> > (Here is some C# code, but I use VB.Net to code my program)
> > using System;
> > using System.Reflection;
> >
> > public class Driver
> > {
> >    static void Main()
> >    {
> >        Assembly assembly = Assembly.LoadFrom ("myplugin.dll");
> >        Type t = assembly.GetType ("SamplePlugin");
> >        IPlugin plugin = (IPlugin) Activator.CreateInstance(t);
> >        plugin.SayHello();
> >    }
> > }
> >
> > The problem is, I don't want to have to know the name of the class I
want
> > to
> > load...  I want to load the new module and get an instance of the class
> > that
> > derives IPlugin. Is there a way to do so?
> >
> > In C++ for the same purpose, I had a win32 dll with an extern function
> > that
> > returned an instance of the contained class, so I loaded the dll, called
> > the
> > function and I was ready to proceed.  Is there something similar I can
do
> > with .NET class libraries?
> >
> > thanks
> >
> >
> >
>
>