Load / Use And Unload An Assembly At Runtime
Dec 1, 2011
I am working on a project where I have to load assemblies (lets call them tasks) at runtime, run the task and then be able to kill off the whole assembly so that the dll can be replaced without interrupting the main application.There are many of these tasks running within the main application,some run sequentially and some run in parallel.Occasionally one or to of these tasks need to be updated and then re-added to the queue. Currently we are stopping the entire application and interrupting the other tasks at whatever stage they are at, which is not ideal.I have figured out that I will have to load each assembly into a separate AppDomain, but loading the assemblies in those domains is proving difficult, especially when I need to actually run the tasks and receive events from them.I have been looking into this problem for a couple of days and have still not managed to get a working proof-of-concept.
I have an Interface for the tasks which includes a 'run' and 'kill' method (subs) and a 'taskstep','complete' and 'killed' event.'taskstep' returns an object to be cached later, 'complete' fires when the whole task is done and 'killed' fires when it is ready to be unloaded.There should also be a timeout on the whole process of two hours and a timeout of 2 minutes on the killed event in case it gets stuck, at which point I would like to be able to unload it, forcing any threads to terminate (which is what 'kill' should do anyway).Each assembly may contain several tasks, all of which should loadable be unloadable.I have no problems loading these tasks as 'plugins' but am lost when trying to both use them and unload them. If I have to create some elaborate wrapper then so be it but is what I need even possible? I have tried inheriting from MarshalByRefObject but I do not even know the assembly fullname unless I load it first, which then locks the file. I have tried loading from a byte array of the assembly. This means that the file is not locked but a copy of it remains in the current appdomain. This will become problematic over the following months / years![code]
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Jan 15, 2007
Our company has an app that load their components by System.Reflection.Load (By the way, an awesome technique )But, we start to monitorate the application and detect a extrange grow up of memory (actually when our application still all day on air, their allocate memory on task manager is 200 MB plus memory) And all of our components (60 plus DLLs) is load by this technique.My doubt is how to deallocate this assemblies or how the best way to deallocate any assemblies loaded by the System.Reflection.Assemblie.Load method?
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Apr 23, 2012
Not sure if this is the correct place for this postWhat I am trying to do is update dll's in my application.Using VB with dotnet 2 (Visual Studio 2010)The Project has a number of Dll's one of each department i.e. Sales is sales.dll... Development is development.dll etc....Each dll has classes/User controls which is used and dispose depending on the section within the application.Once work has been completed with a dll, it put in the deployment area, currently another is program launching checks the file verison and updates as required, before the main application lauches, this works. The exe hasn't needed updated for a long time as all the changes are in the dlls.
What i have been looking at is update method for the dll's dymanically, when not in use, when the dll called into use or disposed of.I have looking at LoadLibrary/FreeLibrary and application.domain. I have been reading loads and tried out some of the examples, with a modified to suit. I am just not getting it.
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Jun 6, 2011
I'm working with a 3rd party assembly to implement something in our in-house software. I can make the refence and work with the library without a problem, but when I run the program to test it i'm getting this error "Can't load file or assembly "assembly file" nor either of its dependencies. The system couldn't find the specified file" (i'm from Mexico, exception is in Spanish so i had to tanslate it, sorry for the poor translation) I have given read and write permission to the file, the folder, and for all users and still wont load it. I saw that the assembly has the PublicKeyToken=null, does that have any to do with that i cant load the assembly?
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Jul 9, 2011
I wrote an assembly(not managed completely ("1.dll"))
i want to load it at runtime (in a managed assembly) but when i try to load it it give me this error:
"Could not load file or assembly '1, Version=1.0.4207.24855, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Attempt to load an unverifiable executable with fixups (IAT with more than 2 sections or a TLS section.) (Exception from HRESULT[code]...
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Jun 17, 2009
I receive this error as "Assembly Load Error" whenever adding a form or other object that has to be inherited.
"Unable to load assembly. Ensure that the file is a valid .net Framwork assembly"
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Feb 26, 2010
I am calling a Fortran DLL from Vb.Net. I am declaring this in the class and then I am calling the DLL. I made this Fortran DLL from a Fortran Exe code. If I just use the exe code of the Fortran program I get different values than if I use Fortran DLL. First I thought may be there is a delay, so I used Sleep() before the end of the loop. But this does not change the values I am getting. I don;t understand why the results are different in exe and DLL, since I made DLL using the same exe code. I am not sure if the DLL is completely exited before it called again. Below is the code (partial).
Declare Sub abbb Lib "C:Documents and Settingssanjida.tamannaMy DocumentsVisual Studio 2005ProjectsDll53Dll53DebugDll53.dll" Alias "aaa" (ByRef TOL1 As Single, ByRef tt1 As Single, ByRef TEND1 As Single, ByRef t_exposure2 As Single)
[Code]....
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Jun 23, 2010
Followup to a previous post: It's been determined that Windows Device Drivers cannot be written in VB.NET; that's being dealt with separately.
What I'm interested to know here is if there's a DotNET Framework facility for adding/removing/managing device drivers; for example, can I build a VB.NET application to list loaded drivers, or drivers attached to a specific device, then load or unload those drivers as needed? It never hurts to try. In a worst case scenario, you'll learn from it.
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Oct 9, 2009
load and unload form just like vb6 in vs 2005 using vb.net. I'm trying this code.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Me.Close()
[Code]....
but when i click the button, nothing happened..
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May 6, 2012
I have an application in which i need to load a specific keyboard layout only when application is running and a text box (Textbox1) is under focus. I don't have an idea to load a specific keyboarded in VB.NET via programming.
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May 29, 2009
I am using MDI form and nearly more than 10 child forms.. Here, When i load or unload some forms, it flickers very much.. It is not as much good.. So i need to avoid this.. How to avoid form flickering?
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Jun 27, 2009
I'm just wondering, what is the best way to load and unload forms with visual studio 2005. In VB6, I used to use the following at a button click, for example.
[Code]...
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Dec 29, 2011
I'm in the process of trying to create a new appdomain to load plugin dll's, then unload the new appdomain so I can update the plugin dll's without having to exit the main application. There are many, many examples out there and it looks like it should be fairly straightforward, however I'm having a problem where the main application is loading the plugin dll's along with the new appdomain. Of course this is a problem because I cannot overwrite the plugin dll's if they live in the main appdomain. Based on the examples I've seen the code below should only load the plugin dll into the new appdomain, however for some reason it also loads into the main appdomain.
Dim oDomain As AppDomain = Nothing
Dim oSetup As New System.AppDomainSetup()
With oSetup
[code]....
The IDPAPlugin interface is in a seperate project that both the plugin dll and the main application reference.
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May 31, 2009
When ever I finish simple programs no matter what it is and i click to debug it it comes up"Error while trying to run project:could not load file or assembly"project name" or one of its dependencies.the module was expected to contain an assembly manifest"
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Oct 8, 2009
One of them is giving us trouble in only 1 spot out of the 4 spots we use it at:The trouble spot is a windows form project that uses reflection to dynamically load some DLLs that run long running processes. One of these long running processes is an agent that relies on one of our vender DLLsWe're getting the missing assembly exception at the point where we first enter a function that references the library. I already checked the silly things such as if we had forgotten to move a reference from the old version to the new version, but that's not the case. I also checked the bin directory of the project and the assembly is there.
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Jun 16, 2010
VB 6.0
Private Sub Form_Unload(Cancel As Integer)
VB.NET 2008
VB 6.0
Private Sub Form_QueryUnload(Cancel As Integer, UnloadMode As Integer)
VB.NET 2008
is VB.Net supported this two events ?
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Jul 30, 2009
Can I change the app name at run time[code]...
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Jun 5, 2009
Well i m going through a problem, may be anyone knows the solution or may guide me.abcconfig file contains
<configuration>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
[code].....
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Jul 21, 2009
I have a file name, like "Foo.dll," for a library that I know is in the bin directory. I want to create an Assembly object for it. I'm trying to instantiate this object from a class that's not a page, so I don't have the Request object to get the path. How do I get the path I need to use Assembly.Load()?
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Apr 10, 2009
How does CLR load assembly?
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Mar 13, 2010
Can somebody show an example of loading a standalone assembly, enumerating its methods and invoking one?
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Jul 6, 2010
This is my Errormessage:
Could not load file or assembly 'file:///C:Windowssystem32Rule.dll'. The system cannot find the file specified.
The problem is that the same exe works in my development environment but not on productive server. The program is a tool that should run as a Scheduled Task on Windows Server 2008. It consists of an exe, one so called Database.dll and the Rule.dll. The exe should load the Rule.dll dynamically in codebehind but it fails with the above error only when started from Task Scheduler. Why is it looking in System32 folder and not in the Application folder? Is it an UAC-issue?
'Load the rule engine into memory
Dim asmRule As System.Reflection.Assembly = Nothing
Try
[Code]....
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Apr 17, 2009
I am getting the following error message below and don't know why. I've even rebooted my machine and it still won't work.
[QUOTE* Exception Text **************
System.TypeInitializationException: The type initializer for 'EBOLVendorReports.modIO' threw an exception. ---> System.BadImageFormatException: Could not load file or assembly
[code].....
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May 20, 2012
if I want to open my vs2008 project, I get the error "Could not load file or assembly 'Microsoft Build Engine, Version=3.5.0.0, Culture=neutral, .... or one of its dependencies. The system can't find the specified file." Yesterday it has no problem and today I get this message. I have uninstalled nothing, I have net framework 3.5 and in the meantime 4.0 too, I use win 7 x64. I tried to repair the install of vs2008 with the dvd, no succes. what I should do to get this to work again? I don't want to reinstall win 7 (inkl. format the system drive).
EDIT: I checked the system with the net verify tool, and it comes out, that some dll-s in the assembly directory are missing. Now, I clean up all net framework on the system, then I will install the net framework 3.5 sp1 and let's see, whether it works or not.
EDIT 2: I even can't install the net framework 3.5 sp1. I downloaded the full pack from microsoft and if I click on it, nothing happens. Why?
EDIT 3: after reinstalling all vs2008 components and after running the net removal tool again, I wanted to install vs2008 back. And the install says: the net framework 3.5 (x64) is installed. I know, win 7 contains it. Then how the hell can I uninstall and reinstall the net framework 3.5??
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Jun 5, 2012
Usually, when I create an application, all I need to do is copy the .exe file from the "inDebug" folder to run onto other machines.
But this time, I've got a 3rd party control. So, copying the .exe isn't good enough. I get a message as soon as the application loads "Could not load file or assembly ..."
I have added a "Setup and Deployment" to the project, but that still doesn't seem to include all of the files to the 3rd party control.
Because after successfully installing this application, the same error message is displayed "Could not load file or assembly ..."
how I can get this application to run on another machine without installing this 3rd party control first?
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Jul 4, 2010
I created a setup file for my project, and i keep getting a can not load file or assembly error.There are no erros in my build or project.I can test this, and it works fine on my localbox wile in my vs.net project.When i create a setup file, and test it on another machine, i get this error below.
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Dec 2, 2009
After working all morning and finally getting my dll to talk to my rdlc files, I decided to import my functions into my other code, but I get the aforementioned error.My dll is in my PrivateAssemblies folder as well as both my debug and release folders (x86 in case you were wondering).
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Jun 14, 2012
I created two projects. They are VB.Net dll and c# .net dll file. I am using VB.net dll file into c#.dll file. when i test c#.net dll file it is giving error message Could not load assemble. if i use both then it is working fine.But i have to use only one dll file. Let me know how can i do with only c#.net dll file.
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Apr 19, 2011
I would like to load a class library at runtime. As such, I thought I could use reflection to do so.However I am receiving the exception "Unable to cast object of type 'MyLibrary.LogSystem' to type 'MainApp.ILog'." in my main application. To start with I created a Class Library (VS2010) with a simple interface and one class that implements the interface.
[Code]...
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May 26, 2009
I have a web application in .Net in which I use Ajax controls in some pages. Those pages are working in localhost, but when hosted, the pages in which Ajax included shows following error.
Server Error in '/Allforkids' Application.
Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.
Exception Details: System.Security.SecurityException: Request for the permission of type 'System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
[Code].....
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