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I'm writing an app that supports plugins, using the SimplePlugins library.
Plugins live in a separate subfolder.
Both the app and its plugins reference the SimplePlugins DLL.
For the plugins, the SimplePlugins assembly performs a sanity check to ensure that the plugin module includes at least one object derived from PluginBase (that lives I the SimplePlugins assembly).
So in the grand scheme of things, the app loads first, and uses the SimplePlugins creates a new app domain for each plugin assembly, and then performs said sanity check which calls the IsSubclassOf reflection method.
The sanity check fails unless I change the Copy local property for plugin's reference to SimplePlugins.DLL to false.
My question:
Why doesn't IsSubclassOf find the specified derived type without setting Copy local to false? Is it because I'm crossing app domains? Is it because the plugin is loading a different copy of the SimplePlugins DLL?
".45 ACP - because shooting twice is just silly" - JSOP, 2010
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You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
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When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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More information is needed.
- What is the base directory of the AppDomains?
- How are you triggering the code in the AppDomain?
- Is the SimplePlugins.DLL also stored in each plugin-subfolder?
- Which assemblies are now loaded in the appdomain? Debug to find out the exact location.
- 'Why doesn't IsSubclassOf find the specified derived type' - does not make sense. IsSubclassOf returns either true or false.
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maarten_oosterhoff wrote: - What is the base directory of the AppDomains?
I don't see how that matters. The plugin DLL is in a subfolder of the app's folder.
maarten_oosterhoff wrote: - How are you triggering the code in the AppDomain?
Calling a method.
maarten_oosterhoff wrote: Is the SimplePlugins.DLL also stored in each plugin-subfolder?
Yes, but that's when it fails. If I don't copy it to that folder, it's fine.
maarten_oosterhoff wrote: - Which assemblies are now loaded in the appdomain? Debug to find out the exact location.
The app is in one domain, and the plugin is in another.
maarten_oosterhoff wrote: - 'Why doesn't IsSubclassOf find the specified derived type' - does not make sense. IsSubclassOf returns either true or false.
Yeah, I know. My statement indicates that it's returning false.
I just want to know why it makes a difference.
".45 ACP - because shooting twice is just silly" - JSOP, 2010
-
You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010
-
When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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For me, to try to solve your question, it was necessary to ask for some more info. Working with AppDomains and dynamically loading assemblies is tricky, and I need to know what it is exactly that is loaded in the AppDomain, and what the start-up parameters are of said AppDomain (like the base-directory).
My apologies if this was not to your liking.
Good luck solving your problem.
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I have an application using System.DirectoryServices.AccountManagement. This exe is in network and almost all user can run the application. For one user, The error is displayed as follows:
Unhanded exception has occured in your application. Could not load file or assembly 'System.DirectoryServices.AccountManagement, Version 3.5.0.0, culture =neutral Public key token = .b77assks778wsdcsd8' or one of its dependencies. The system cannot find the fie specified.
He is having the .Net framework 3.5 and 4. Can some one help me resolving the issue.
Thanks in advance.
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That's the wrong public key token. It should be b77a5c561934e089.
Is that a typo in your question? If not, it sounds like his .NET installation is corrupt.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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dear sir ,
i want filter data from database using two date time picker and one text box to get accurate filtered record in datagridview
please help me
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Member 12367484 wrote: please help me
Help with what? You need to explain where you are stuck and what part of your code is not working.
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How can I detect a VPN connection?
How can I detecting application request from VPN, Is it possible?
modified 22-Jul-16 5:24am.
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A VPN connection to what?
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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There is any way for detecting client request is from Virtual Private Network or directly client computer?
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A client request TO WHAT?
You haven't told us anything about your application.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Not under normal circumstances.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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I suspect the IP address, workstation id, user id, logon type, etc. might give you a clue.
Checkout the Windows Security logs.
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Hello Friends,
I'm developing software that uses the DiscUtils to store files in a container such as a virtual disk (VHD), I'm trying to use Ntfs system with VHD, but I've gone through soo many problems because I store a lot of files with varied sizes. The library generates random exceptions. The idea of using that library was to not spend time creating a file system.
The advantage of DiscUtils is that is native C#, so I can use it with Xamarin.
Well, i need an alternative or help to make it work, I need something that can store various files in a container (like a virtual disk). It can be a library that i use with pInvoke , any other library, or a help on how to use the DiscUtils correctly.
I've tried a thousand forks of DiscUtils.
Thank you, I'm desperate to solve this problem. 
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mInternauta wrote: I need something that can store various files in a container (like a virtual disk).
..something like a file-archive (like PkZip, LHA), but without the compression?
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Eddy Vluggen wrote: ..something like a file-archive (like PkZip, LHA), but without the compression?
The only problem with these algorithms is that there is a reconstruction of the file when an entry is removed or added.
What becomes unusable.
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mInternauta wrote: The only problem with these algorithms is that there is a reconstruction of the file when an entry is removed or added.
Similar to a VHD, a file being modified is being written to. Having hooked a Dokan to a ZIP-file, it simply feels like a file-system.
Alternatively, you'd use a local database.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Eddy Vluggen wrote: Similar to a VHD, a file being modified is being written to. Having hooked a Dokan to a ZIP-file, it simply feels like a file-system.
Alternatively, you'd use a local database.
Do you recommend any particular compression algorithm?
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You'd be using it as a file-archive, so I assume you're more interested in speed than getting a good compression. PkZip has (just like some others) the option "not to compress" anything. Meaning you'd have a (or multiple) dumb container(s) for storing/retrieving files.
You may want to create a test-setup and compare this to a local SQLite database; I'm not sure which of the two would perform better.
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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Thanks, i'll make some tests. 
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You're welcome 
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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There are no "random exceptions"; you need to isolate the problem so you can consider an appropriate action (fix; abandon; whatever).
Work with one "file type" at a time instead of a "lot of files" starting out.
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This is a backup software so i need it to work with any file type. I've tried to isolate the problem, but it would take a long time to understand the algorithm and fixes it.
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