Deployment :: Referencing Assembly From Another COM Enabled Assembly?
Apr 7, 2009
I have written a .net assembly which plugs into to a third party COM application. The .net assembly is COM visible to the third party application. However this .net assembly references other regular assemblies. If I put these assemblies in the GAC the COM visibile assembly sees them without a problem. However for various reasons I do not want to put them into the GAC but I cannot get my COM visible assembly to see the other assemblies when they are in other locations. I have tried putting them in the same directory as the COM visible assembly. I have tried putting them in the same directory as the third party app's exe but neither of these work.
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Aug 9, 2010
I'm returning to my old question since I've never been able to find an answer.
For example I have a class library A with a method Method, is there a way to load this assembly from my application B and execute this method (A.Method) without putting a reference to assembly A?
My idea isn't that the idea behind System.Reflection?
So far, I can only load the assembly, I can even enumerate classes, members, etc, but I cannot figure out how to invoke methods and read property values.
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Feb 23, 2009
We have one program that acts as a "server" (so to speak) and many programs that reference it. every time we update the server, we are forced to update all the dependent programs to reference the new version number. Our IPC communication protocol is pretty stable and doesn't change, so we aren't worried about upgrade incompatibilities. I would like to know how to automatically reference the "latest" version of an assembly. What I mean is, if I choose Project->properties->references, I always get a specific version. Is there a way to reference whatever the latest version is? This way, we wouldn't have to update every program that is dependent on our server every single time there is an update.
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Feb 15, 2012
Currently I have a need to reference a class library dll that is not located in the same directory as the exe nor its subdirectories. Can anyone point me in the right direction on this? Are there any good articles or tutorials on it? I have been looking through my .Net books and some go into details in a different direction and none that I have seem to cover it. To be honest, if theres a nice tutorial or article on this topic with sample code to look at, that would be ideal at this point in my project (Im literally presenting on it twice tomorrow).
I have to admit that Im fairly ignorant of this topic, but its my understanding that I should be able to accomplish this using the assemblyBinding elements in the application configuration. If I do use a codebase approach with the app config, am I suppose to do something in the exe code to read the config and load? The class library that Im refrencing am I supposed to have any special methods or classes in it to make this work? I think I have more questions than answers.
If you want more of the nitty-gritty details on the current scenario, here it is:
I have an executable Ive developed (well call this myApp.exe). I also have a centralized data-accessing class library (well call this appData.dll). This exe actually utilizes a framework Ive designed to run from within a third-party companys application. To ensure the myApp.exe is more maintainable and accessible, it will be located separately from the framework.dll and the appData.dll. The framework.dll will most likely reside in the same directory as the third-party exe, but separate from the appData.dll and myApp.exe. So I was considering applying the assemblyBinding elements in the application configuration files for the myApp.exe pointing toward the framework.dll and the appData.dll while that for the framework.dll will be pointing toward the appData.dll (this is why the data access library file is central between the two).
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Dec 28, 2005
When running setup to install published program, the following message occurs: System Update Required: Unable to install or run the applicaiton. The application requires that asssembly CrystalDecisions.CrystalReports.Engine Version 10.2.3600.0 be install in the Global Assembly Cache (GAC) first. This version is listed in the references of the program and in my mind, be included in build. How do I get by this error?
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Apr 18, 2012
When running setup to install published program, the following message occurs: System Update Required: Unable to install or run the applicaiton. The application requires that asssembly CrystalDecisions.CrystalReports.Engine Version 10.2.3600.0 be install in the Global Assembly Cache (GAC) first. This version is listed in the references of the program and in my mind, be included in build. How do I get by this error?
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Dec 4, 2009
I have recently upgraded an VB6 project to vs2008. I was almost finished when the following error occured. Unable to emit assembly: Referenced assembly AxInterop.MSFlexGridLib does not have a strong name Prior to this error appering, I tested my app several times and it was fine. Only after publishing it did the error appear. I have tried all solutions I could find, but nothing helps. I have read [URL]
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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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Apr 2, 2012
I am loading an Assembly using Assembly.LoadFrom() as the assemblies are located in a different path from Application Base directory.
Dim oAssembly As Assembly = _
Assembly.LoadFrom("C:\MyFolder\" + ddlXlate.SelectedItem.ToString() + ".dll")
And I consume a Type from that assembly without any problem:
oXML = CType(oAssembly.CreateInstance(sBaseType + ".XlateContainer"), _
XlateBase.XlateContainer)
However, the problem occurs when I try to use a Type from this assembly from within another method like the one below:
oComboBox.DataSource = _
[Enum].GetValues(Type.GetType(sType + "+ItemEnum," + sAssemblyName))
sAssemblyName is the one I loaded using LoadFrom() actually. After it said it cannot find the assembly, I used AssemblyResolve event which solved my problem :Subscribing AssemblyResolve event :
AddHandler AppDomain.CurrentDomain.AssemblyResolve, _
AddressOf MyResolveEventHandler
Event Handler Method:
Private Shared Function MyResolveEventHandler(ByVal sender As Object, _
ByVal args As ResolveEventArgs) As Assembly
Return Assembly.LoadFrom("C:\PSIOBJ\" + args.Name + ".dll")
End Function
And I thought maybe the error occurs because it cannot find a dependent assembly defined in assembly manifest file I loaded using LoadFrom() already but when I checked the args.Name, I saw it was trying to load same assembly and after that it worked without any problem. So basically a type in the loaded assembly cannot be found before the event adding change.
My old code was using AppDomain.CurrentDomain.Load() and Assembly.Load() methods and they were working fine without the AssemblyResolve event. I was able to reach types in dynamically loaded Assembly from every where within the same AppDomain.
LoadFrom() can find dependencies automatically within the same requested assembly path and that couldn't be problem as everything this dll needs was there. So at first it looked like a AppDomain problem to me as it looks like it seems it can reach assemblies from Load context instead of LoadFrom context and I am now using LoadFrom context.But now it seems I should pass oAssembly instance evertwhere to use any type from the loaded assembly?Doesn't it load the assembly where I can reach it everywhere (same AppDomain) using simple Type.GetType(...) method?
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Jun 18, 2008
i am writing a simple games client using an XNA 2.0 engine to play games. The games are written in dll files and the client uses the assembly.loadfrom method to read and execute the games accordingly...Now this all works fine on my computer and my laptop. However when i give it to my friend he gets this error and the dll doesnt load - "Unable to load one or more of the requested types. Retrieve the loader exceptions property for more information"
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Jun 1, 2011
I'm wanting to include a system tray icon in my WPF project, and found this resource:[URL]..which looks like it will work beautifully, but it's written for C# and I'm using VB.net for this project. I downloaded his project and built the notifyicon as a DLL, then added as a reference to my project.
It throws up an error: Unable to emit assembly: Referenced assembly 'Hardcodet.Wpf.TaskbarNotification' does not have a strong name So I'm trying to figure out the best way to proceed. Do I need to strong name it, or is there a better way to do this?
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Oct 9, 2008
I've got an exception when I deployed my application: "the located assembly's manifest does not match the assembly reference" What I remember is changing the project name from the previous source code, does it affect that much?
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Jun 19, 2009
I created a Windows Application using VB.NET 2005 Express Edition.In my project I have two references to DLLs from a 3rd part product, so that I could access its API (Ascent Capture 7.5 from Kofax if you needed to know).For the two references, I have set the Copy Local property to False, and in the app.config file I am using assemblyBinding to reference one of the DLLs.When I build the application and then execute the EXE file in the inRelease folder, everything works fine. When I do a publish and try to run the setup.exe application that is created, I get an error message that basically states the DLL I referenced in the app.config file needs to be installed in the GAC.So why does my application work fine from the Release folder without having to do anything to the GAC, but I cannot install using the setup.exe from the Publish? I would like to use the setup.exe because I need to install this on other machines than my own.
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Jun 25, 2012
I have created several DLL (.NET) libraries that are used in several projects. In these DLL libraries I want to know/retrieve which assembly (EXE) calls/uses the library, so if possible I want to know info like assembly name (EXE), strong name, version number, etc.
NB: Examples may be in C# or VB. I use both languages.
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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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Apr 21, 2011
sorry for my English, I don't speek well... I need to compile assembly in memory, that can compile another one. There is a form with one button. Here is a code of the form
Imports System
Imports System.Threading
Imports System.CodeDom
Imports System.CodeDom.Compiler
Imports System.Collections
[Code]...
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Jan 14, 2010
Since, it's possible for anyone to name an assembly starting with 'System', checking for 'System' is not a satisfactory solution.
Alternatively, if that's not possible, how about checking the modules in an assembly?
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Jun 20, 2010
I am building a dll-Assemby A which references another Assembly B. Assembly B is strongly named and installed in the GAC of my development computer. An other computer will not have assembly B installed in the GAC.
Question: If i handle strongly named assembly B like a private assembly and copying it into the bin-directory by specifying local copy = true in the properties-window, will the programm run on the other computer?
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Feb 3, 2010
We are trying to write an application that uses the NServiceBus library in a VB.NET environment. We've been stymied by errors similar to the following: Reference required to assembly 'NServiceBus,Version=2.0.0.1071, Culture=neutral, PublicKeyToken=9fc386479f8a226c' containing the implemented interface 'NServiceBus.IMessageHandler`1'. Add one to your project.Our project already includes references to NServiceBus.dll and NServiceBus.Core.dll from the same NServiceBus 2.0 RC2 distribution.
[Code]...
Any ideas about how to solve this problem? (And, yes, my preferred solution is switching to C#, but no, that's not an acceptable one at the moment.)
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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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Sep 20, 2011
Probably a dumb question, but can you write a unit test project in one language to test against another project in a different language?I'd like to translate one of our VB assemblies into C#, but want to build unit tests to verify the results. I've tried to set a unit test project up to do this, but I can't seem to access the VB code within a unit test... I can't figure out if I'm just missing/doing something stupid, or it really isn't allowed.
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Feb 26, 2011
What does [String] mean in VB.NET?
Dim assem As [Assembly] = [Assembly].GetExecutingAssembly()
Dim assem As Assembly = Assembly.GetExecutingAssembly()
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Jun 12, 2011
I have a project, we will call it Asynchronous UPC Scanner (AUS for short). I saved the project with the name of "Asynchronous UPC Scanner" but changed the assembly name and project name to AUS.When I build the exe and run it, the program does nothing but use up 30k memory and they throws an "Failed to initalize..." error. The really weird this is if I change the name of the program to "Asynchronous UPC Scanner" the exe works with no problems....so what is up with that?!
EDIT: OK it seems if I name it anything other that AUS, it works fine...is it possible there is another assembly registered with the same name?
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Mar 30, 2010
I assume because the CLR this wouldn't be an issue?
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Apr 6, 2010
I have 2 dll files from a third party, and they have the same name (v7 and v8). My program needs to be able to use both of these dll's (meaning wether the enduser has a lisence for v7 or v8 of the thirdparty dll, they can still use the program). But I am stopped from referencing both of them as they have the same name. How do I resolve this? Searched the web and found info about sn.exe and strong names, but can't find a good explanation of how this works. Anyone?
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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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Oct 28, 2010
I am using this code, I got it to work fine with any C# assembly that allows it to be ran from memory. Is there anyway I could get it to work with VB.net?
private static void RunFromMemory()
{
try
{
[code]...
The error I receive is "Parameter count mismatch"
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Apr 20, 2012
When I add a .dll file as a reference in C# application it shows an error:A reference to the ".dll" could not be added.Please make sure that the file is accessible and that it is a valid assembly or COM component.
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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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