B.K.M for dynamically resolve assembly location - a question [modified] - C# Discussion Boards

Re: Threaded server client two way communication problems and best practises

5-Oct-10 3:04

Yeah, WCF.

And, no, the server shouldn't tell the client to do anything; it merely serves.

teknolog1235-Oct-10 3:36

teknolog123

5-Oct-10 3:36

Let's say the server asked client to do something. is it not possible? Then what is the way of telling client to do something and report back? and Is it also not possible in WCF?

Re: Threaded server client two way communication problems and best practises

PIEBALDconsult5-Oct-10 15:08

How to identify is a certificate is in a smart card?

5-Oct-10 15:08

It may be possible, but that is not what servers do; it's poor design.

XML File problem

InderK5-Oct-10 1:22

InderK

5-Oct-10 1:22

Hi,

Please help me regarding a doubt. i have a .xml file which is having around 3000 nodes, now I want to retrieve the name attribute of those nodes for which store attribute>30. Please suggest the esaiest way to do it.

Thanks,
Inder....

Sunil P V4-Oct-10 22:38

Sunil P V

4-Oct-10 22:38

Hi All,
How can we determine if a user-certificate is contained in a smartcard or if it is installed in the system itself?
I wasn't able to find a .NET class that does this?

Thanks in advance...

Sunil

Re: How to identify is a certificate is in a smart card?

Rajesh Anuhya4-Oct-10 23:28

Rajesh Anuhya

4-Oct-10 23:28

There is no inbuilt class for smart card in .net ,

you have to use winscard.dll wrapper .

go through the below link in CP

A Smart Card Framework for .NET[^]

Rajesh B --> A Poor Workman Blames His Tools <--

Re: How to identify is a certificate is in a smart card?

Goutam Patra5-Oct-10 2:15

Goutam Patra

5-Oct-10 2:15

As much as i know even if a certificate comes in a card then also it has to be installed in your personal store.
While reading the cetificate you need to insert the smart token in order to execute ComputeSignature. And if you set the silent parameter to false while using ComputeSignature it will automatically reads the card and asks for password for the certificate (if any).

B.K.M for dynamically resolve assembly location - a question [modified]

Shultz 24-Oct-10 20:57

Re: B.K.M for dynamically resolve assembly location - a question

4-Oct-10 20:57

Hi all
Your help\opinion is required on a bothering subject I am debating with for a long time...

Tools: .NET 2.0, VS2005. C#

The story:
I am designing a platform that uses plugins (written by her users) and does something with them.
The plugins are mainly dll file(s) that implement some declared interface.
My platform architecture is as such:
The platform sits at certain directory (say c:\PlatformBin).
The plugins sits in user defined location (say c:\UserPlugins)
Upon starting the platform, it accepts at run time (registry key) the plugins directory, traverse and instantiate all plugins resides there.

The problem:
User plugin is eventually a dll, that implements given interface (say UserPluginDll.dll). This dll can use, if\as needed, other external dll's that needs to be in the same directory. (say User3rdPartyDll.dll)
When the platform loads the plugins, it explicitly loads the UserPluginDll.dll file (through Assembly.LoadFile(UserPluginDll.dll);). This works fine.
The problem happens when the platform actually access at runtime to the user code in the plugin, that uses the user 3rd party dll (User3rdPartyDll.dll)
The CLR can't find the relevant User3rdPartyDll.dll file and raises up an exception "file not found...").

The suggested solutions:
Here are some tricks and solutions that I have tried\disqualified:
1. Use GAC (not an option)
2. Add to the appDomain private bin path for the c:\UserPlugins directory (and its subdirectories) - not working since private bin path (and other similar tricks) is always relatively to the app bin path (c:\PlatformBin), and I don't want to create this unnecessary coupling between the users plugins directory and the platform bin directory
3. Use <Probing> element in application config file - not good (and not working as well from some reason), since the plugins directory is learnt at runtime and I don't want the user to go and edit the app config file and change the plugins directory there.
4. Use AppDomain.CurrentDomain.AssemblyResolve += CurrentDomain_AssemblyResolve method, that is raised exactly when the CLR fails to locate the necessary dll.

Summary and question:
I think I will use this forth option eventually, but it also demonstrates a compromise from my side, as it means that the CLR first have to fail and then request my help (at runtime), instead of automatically allows me to tell him at the very first beginning were else he needs to search for its missing dlls at runtime.
I would have expect that CLR will allow me to add additional search paths for searching dll's at runtime, and it drives me crazy that I can't do so !!!

Any one can help ? have other suggestions ?

-- Modified Tuesday, October 5, 2010 3:32 AM

Mycroft Holmes4-Oct-10 22:00

Mycroft Holmes

4-Oct-10 22:00

Member 3941620 wrote:
CLR first have to fail and then request my help

Programming by error - I love it.

Isn't there a reference path in there somewhere, maybe that can be set in the userdll.dll at runtime.

Never underestimate the power of human stupidity
RAH

Re: B.K.M for dynamically resolve assembly location - a question

Shultz 24-Oct-10 23:18

Re: B.K.M for dynamically resolve assembly location - a question

4-Oct-10 23:18

Hi
The solution can't come from the user code side, since the problems occures before actually access him.
In addition, I don't want to force\expect the user to be aware of my (CLR) limitations and have hime handle some technical issues, not directly relating to its domain\knowladge

If, from the other hand, you are aware of an option that allows to define the assembly, upon loading, other assemblies to load when needed - that can certainly be done from my side (the platform) and I will be happy to be notified about such an option...

Thanks
Shultz

Bernhard Hiller4-Oct-10 22:25

Bernhard Hiller

4-Oct-10 22:25

An assembly has a GetReferencedAssemblies() method. Have you tried that? E.g.

string assemblyName = "c:\\UserPlugins\\UserPluginDll.dll";
string assemblyPath = System.IO.Path.GetDirectoryName(assemblyName);
Assembly assembly = Assembly.LoadFrom(assemblyName);
AssemblyName[] referenced = assembly.GetReferencedAssemblies();
List<Assembly> assemblies = new List<Assembly>();
foreach (AssemblyName an in referenced)
{
    string extra = System.IO.Path.Combine(assemblyPath, an.Name + ".dll");
    if (System.IO.File.Exists(extra))
    {
        Assembly tmpAssembly = Assembly.LoadFrom(System.IO.Path.Combine(assemblyPath, an.Name + ".dll"));
        assemblies.Add(tmpAssembly);
    }
}

Re: B.K.M for dynamically resolve assembly location - a question

Shultz 24-Oct-10 23:12

Re: B.K.M for dynamically resolve assembly location - a question

4-Oct-10 23:12

Hi
I wasn't aware of that option and I will certainly test it today (when I will get back home),

I believe though, that it won't work, as the CLR can't realize that the missing assembly at runtime that he searches, has actually been loaded before, and lies at my private 'assemblies' list declared somewhere... ,Unless you can tell of a way that connects my local 'assemblies' list to the ones that CLR is aware of ?

(that is my assumption according to other threads that I have read in the subject and implied that issue..).

I will report once I will try it.

Thanks
Shultz

PIEBALDconsult5-Oct-10 3:07

Re: B.K.M for dynamically resolve assembly location - a question

5-Oct-10 3:07

I haven't run into that problem, so I'm not sure it exists.

Shultz 25-Oct-10 4:59

Re: B.K.M for dynamically resolve assembly location - a question

5-Oct-10 4:59

Be sure. It exists.
CLR doesn't know to search for your dynamically referenced dlls at runtime, unless they appear in its default search paths and probing dirs.
The main question in this thread is how to add him some more search directories to look at...

PIEBALDconsult5-Oct-10 15:08

5-Oct-10 15:08

Write a little app that demonstrates what you think is a problem.

Webpage is fully loaded

wenlong884-Oct-10 20:08

wenlong88

4-Oct-10 20:08

Any one have simple code that will determine whether the web page has fully loaded?

Can be any browser.

rah_sin4-Oct-10 20:31

rah_sin

4-Oct-10 20:31

There is java script window.onload.

rahul

wenlong884-Oct-10 21:07

wenlong88

4-Oct-10 21:07

What about using C#?

wenlong884-Oct-10 21:08

wenlong88

4-Oct-10 21:08

I need a program that run in the back end console then when the webpage is done loading then it will call another method.

Pete O'Hanlon4-Oct-10 21:35

Pete O'Hanlon

4-Oct-10 21:35

Without hooking into the browser, you can't determine what's going on there directly from an external application. You were told this yesterday.

I have CDO, it's OCD with the letters in the right order; just as they ruddy well should be

Forgive your enemies - it messes with their heads

My blog | My articles | MoXAML PowerToys | Onyx

Mycroft Holmes4-Oct-10 21:52

Mycroft Holmes

4-Oct-10 21:52

I thought for a minute this was a school question but I see it is the same OP. At least you managed to get him thinking. I still think you were too gentle, this feels malicious to me.

Never underestimate the power of human stupidity
RAH