I have used a third party dll(ABCpdf) in my .NET app and installed the app onto another machine. The program worked fine but then the trial expired and we purchased the third-party component and copied the new dll into the application directory. When running my app we got an error that assembly could not be loaded. I have noticed that the reference to the dll has copy local set to false so I changed it to true. Still getting the same error.
I checked and there are a number of copied of the dll on the machine - one in the folder of the installed third-party application, one in application folder of my application (copied from the installation folder) and also one in GAC. I did set copy local to true but then again, once the assembly is installed in GAC, that's the version that will always be used.
How can I resolve the issue? Would deleting dll from GAC be safe? Would it resolve my issue? Please advise
Check the references used, etc.
First of all be sure that you're compiling with the right version, with license installed.
You can use this code to add the license key on runtime (to avoid future errors in your customers):
WebSupergoo.ABCpdf7.XSettings.InstallRedistributionLicense("your_serial")
AbcPDF don't need to be installed on GAC. So you can remove it from there.
Then, check the 32/64 bits issue, because ABCpdf use to provide 4 dlls, 2 for each platform (ABCPDF.dll and ABCPdfCEXX.dll).
Try deleting the DLL reference in your project's References and then readding it. Make sure you are adding the purchased DLL that is in your application's directory. I've had to do this plenty of times before when fighting with third-party DLLs...it usually works.
I am writing a commercial application in VB.Net using VS2010. My application needs to access a MySQL database. So I have a reference to MySQL.Data.dll in the "References" section of my Project. For licensing reasons, I want to make sure that this dll file is not embedded in my application. From what I read, if I set the "copy local" property to False, then the file is not copied and I need to specifically copy it to my bin directory. So I set it to False and built my project. When I run it, I can still connect to the MySQL database even though the dll is not in the bin directory. To me this indicates that it is being compiled with the build. However, the reference points to a location on my hard drive where the original MySQL.data.dll resides. Could it still find it there when the program is run?
How can I make sure it is not getting compiled? Thanks.
By the way, it is not in the GAC (I checked using gacutil.exe)
If you're referring to having the actual assembly embedded into yours, then no it does not. It can be done, but it does not happen out of the box.
The application looks at many places for your references when it needs to load it.
GAC
Next to the application (maybe also the consuming assembly)
x64 and x86 folders next to the application (maybe also the consuming assembly)
Any paths specified in the app.config/web.config for the referenced assembly.
Keep in mind that just because your application fired up, it doesn't mean it found all of the references. It more than likely hasn't loaded all of them yet as it will only do it once it is needed.
This is driving me crazy. I have developed a .NET COM DLL that is used by a VB6 DLL wrapper in order to update and replace some legacy functions in an application.
I am now trying to remove the requirement to use regasm on client machines so have worked out how to do that on a test DLL which all works fine.
I branched the DLL just in case and added an app.manifest file. Everything else worked out fine and I got it all working. The manifest is embedded and Visual Studio 2012 generates a mydll.dll.manifest file in the release folder.
Then I went back to the original trunk and added an app.manifest file (no point in merging as there were no code changes). I copied the contents of the branch into the app.manifest file and built the release version. The manifest is embedded in the DLL but no mydll.dll.manifest file is generated.
I know that it's not strictly necessary to have the mydll.dll.manifest file but I'd like things to be consistent (and for some reason the test process doesn't produce the same results with the trunk version) so how can I force it to be created?
This is a VB.NET DLL project so it doesn't have (or I can't find) the 'Generate Manifest' property drop down mentioned in the first answer here. How can I set this? Or is there a way to set it by editing the project file directly?
References:
Original walkthrough article and some corrections.
Overview by Junfeng Zhang in two articles plus a useful tool
You are making a fairly common mistake. A reg-free COM manifest helps an application find a COM server without looking in the registry to locate the DLL. Embedding the manifest in the DLL is like trying to solve the chicken and egg problem, Windows cannot possibly find that manifest if it cannot locate the DLL first.
The manifest needs to be part of the client app. Which is tricky since it is VB6, it doesn't support embedding manifests in its executables.
You could tinker with the mt.exe tool, an SDK utility that supports embedding manifests in an executable. You'd have to run it by hand after building the VB6 binaries. That's unfun and very likely to cause trouble when you forget. It is in general not a joyful tool to use, documentation is meager, incomplete and unhelpful, a chronic problem with manifests.
The fall back is a separate app.exe.manifest file, what Windows will look for next when it cannot find a manifest embedded in the executable. Where "app.exe" must be renamed to the name of the VB6 program. The EXE, not the DLL. This now also gives you a chance to avoid having to register the VB6 DLL, presumably what you really want if you truly want to make your program run reg-free. The disadvantage is that it will not work when you debug your VB6 program, wrong EXE. You'd also need a vb6.exe.manifest, located in the VB6 install directory.
Needless to say perhaps, very hard to get ahead with VB6 here. It just wasn't made to help you do this, they didn't have a time machine in 1998.
I have to admit that I don't know VB at all, but in the case of C++ and C# Visual Studio projects I previously had to resort to calling mt.exe in a post-build step in order to get the DLL manifest I wanted. Maybe that workaround would work in your case as well?
I have a seemingly random problem where my project will run using an old version of a DLL file that no longer exists. Sometimes the real version of the DLL file will be used, other times an ancient version of the DLL file will be used. Who knows where Visual Studio is getting this DLL file from - it's months out of date!
I know that it is using the old DLL file, because when the application runs I start getting weird 'TypeLoadExceptions', complaining that methods don't exist or don't have implementations.
The following actions will sometimes help, sometimes not:
Restarting Visual Studio
Restarting the computer
Cleaning and rebuilding the solution
Deleting everything in \WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files
Searching for and deleting instances of the DLL file in \Documents and Settings\username\Local Settings\Temp
Sometimes I perform all of the above steps, and it still uses an old copy of the DLL file. Where is it hiding it?!
The same issue exists on our TeamCity server which is using MSBuild. When TeamCity tries to run unit tests it uses an old DLL file.
Now, I know that I can use assembly redirection in the web.config file, but the version number of the DLL file hasn't changed (I don't bother to update it, so it just stays at version 1). I don't want to have to start versioning the DLL files just to solve this problem. I would just like to know which particular caches I need to clear so that I can get on with developing.
It hides it in the GAC. There it may reside indefinitely. Using a more recent version may indeed solve the problem, but there is an outstanding bug in Visual Studio that has to do with choosing the correct version of DLL files. (If DLL Hell wasn't bad enough, the Visual Studio team is making it worse!)
Finding it in the GAC is tricky, and I cannot advise you on how to do that, but once the old version is deleted from there, it will not be found again. Sometimes, even though you are pointing the compiler at a newer version (by date), it will use the older version, because it has the same version level (by version). That is its bug.
Who knows where Visual Studio is getting this dll from - it's months
out of date!
The Modules Window is your friend...
It'll tell you exactly where that file is coming from. You can even use it with arbitrary processes if you attach the debugger.
I too would guess that they're hiding in the GAC.
You can look in 'C:\Windows\assembly' to see all the dlls and unregister yours from there.
The problem may exists with the build order or your projects.
If your Test project is built before the application project, this cause the behaviour you describe. To fix this: right click on your main project in VS and select the Project Dependencies... option and check the build order. Changes to the build subsequence can be made here by correctly setting these dependencies.
I had a similiar problem (but without Visual Studio). I am loading a .NET dll using UnsafeLoadFrom.
On one computer (a terminal server) the old file still remains being used, regardless of updated version numbers, etc.
The reason is simple: As long as a program instance is running, which has already loaded the old dll, the new dll will never be used. All further UnsafeLoadFrom will become the old dll although the old version doesn't exist on the harddisk anymore, because it has already loaded some time ago.
The solution is to shut down all running instances of the application or even restart the computer. Then all new instances will get the updated dll.
In my case, this was caused switching to Release mode, which had a different configuration (that used different location of the DLL).
In my case, I use Visual Studio to Publish Website, and though I check the reference of the dll file has changed, but the published dll still is old. Finally I new a Publish Web Profile and choose the right configuration (such as Debug - x86 / Release - Any CPU), publish again then the dll is corrected.
While this question is old, maybe someone will stumble upon it again in his/her quest for finding a solution.
In my case i got a CS0433 error for an ASP.Net page. After deleting the content in the obj\ and bin\ folders of the project, it worked again. Probably has to be done with a closed Visual Studio. Maybe also clean out those folders in referenced projects in the same solution (if used in the project and not pulled via Nuget).
In my case, the old DLL was in
C:\Windows\Microsoft.NET\assembly\GAC_MSIL\MyDLL\MyDLL.dll
It DID NOT show up in c:\Windows\assembly.
I did a search of my drive for MyDLL, and it showed up as indicated above. I was debugging my test app at the time, and tried to delete the offending folder...no go...it was locked by Visual Studio. I had to stop debugging my app, close Visual Studio, and then delete the folder. Problem solved!! I don't know how my DLL got there, but it hasn't showed up there since I deleted it.
It's possible that the DLL is being referenced from another folder. It could even be on a network drive if you have one in your PATH environment variable. Here's how Windows searches for DLLs:
http://msdn.microsoft.com/en-us/library/7d83bc18%28v=vs.80%29.aspx
In My Visual Studio 2015, I ensured that the offending Visual Studio project's Reference Path Listing is empty:
If you find such problem ,delete your Reference dll and pdb extensionfile add new references and rebuild your project .This often happens due to no rebuild of project,commit and updates.
The fix for me was making sure that the virtual directory in IIS was pointing to the correct directory. I have two projects on my system, a v4 and a v5. The virtual directory on my dev system was pointing to the v4 bin directory instead of my v5 bin directory - oops!
The file that was being cached in the dll, I couldn't trace the file, so I ended up renaming the file. This might not resolve the problem mentioned here but this was the fix that worked for me related to this question.
I tried a ton of things including re-installing VS 2107.
You can see where the DLL files are being loaded from in your Output window. After going through all mine looking for project DLL, I found it.
Clearing this worked for me.
C:\Users\YourUser\AppData\Local\assembly\dl3\222Q4G1T.8AT\JBEAR7PB.E3J\8bfcf9ab\6e61cbd5_30acd401\YourDLL.dll'
I actually deleted all the files in:
C:\Users\YourUser\AppData\Local\assembly\
Holy Crow! I had an old, old suite of applications including 2 web services and a bunch of class libraries and a click once application. Well, click once stopped publishing for VS 2005 with a bunch of 'not found' errors. So, rather than hack away at my registry as suggested on this site, I figured it was time to upgrade the projects to 2017. Well, when I did this, the projects references in my web service projects got lost. Then, rather than helpfully just telling me that with errors, VS 2017 must have went to some cached file in C:\Users\XXX\AppData\Local\Temp\WebSitePublish or C:\Users\XXX\AppData\Local\Microsoft\VisualStudio\8.0\ProjectAssemblies or C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\root and 'helpfully' just used those files instead! I had to do a hardcore search with a custom program to find all the files on my C:\ drive and delete them before I finally got the errors!
Is it possible to create a VB.Net application which users can just run without installing it first.
If not, is it possible in another .Net language.
If not, how IS it possible :)
PS: The application only has to run under Windows (>= XP).
If they have the .NET Framework installed (the version of it that you developed it), they only need the .exe. You can find the .exe file in the bin directory of your projects folder in your Visual Studio workspace.
If they do not have the framework installed, you'll need to produce an installation for them. It's extremely easy with Visual Studio by just creating a setup project in the same solution as your code.
As long as the user has the .net runtime installed, and your exe has any needed resources in the same folder (dll's, images, ect) theres no problem with that.
If you mean without installing the .net framework though, that won't be possible.
just build the program, and go into the (assuming the project name is app1) app1/app1/bin/debug/ dir. there should be a file there called app1.exe. this file is the compiled .exe from you project. any other computer will be able to run this without doing any installation (provided they have the .NET framework installed (it comes standard on any computer with an os > WinXP))
EDIT: If you were building with debug configuration, it would be app1/app1/bin/debug/, but if you were building with release configuration (which would probably be a better idea if you are distributing) the path would be app1/app1/bin/release/
If you mean running it without the .NET Framework, it used to be possible, but apparently the company's website is no longer in English so I have no idea what's happened to it.
EDIT: If you were building with debug configuration, it would be
app1/app1/bin/debug/, but if you were building with release
configuration (which would probably be a better idea if you are
distributing) the path would be app1/app1/bin/release/
I am developer and have no administration rights to live(production) network.
I had to find away to deploy an app without installation... and my app is self updating this cause other problems too....
The production network Computer check/monitors the file versions etc, so updating in the program files can not be done, where a MSI has been used for deployment.
Using this above I am able to copy and Run the App from the User Profile (where the user has full rights).
lets understand how program runs-
an .exe needs some function which are not inside the .exe, such as , for example substring() function. these predefined function resides in some .dll libraries.
when .exe is executed by user, .exe first finds the .dll and then the function inside that particular .dll.
.exe first looks within the current folder for that .dll
if not found then it searches that in PATHs. (PATH is Environment variable which value is a list of folders such as System32 etc.)
an .exe usually needs only 3 things - .exe itself, .dll which predefined function it is using, and some ActiveX controls(.ocx). apart from these 3, .exe only uses resources (such as icons etc).
lets focus on these 3(.exe, .dll, .ocx)
first you need to check what .dlls your .exe is using. you can easiely do this by using a dependency walker.
then make sure all these .dlls (that dependency walker is showing,or in other words- all these dlls whose functions your .exe needs) are either in current folder(in which your .exe resides) or in the PATHs.
if this step is done then your .exe has high chances to run whithout "installing".
the only problem is that some .dll and all of .ocx, needs to be registered first(means they have to have some kind of registry entry). they are not ready to use just by copying and pasting in current folder or PATHs.
but you can register these .dlls and .ocx's by using regsvr32 (with command line).
after that your .exe should not face any problem to run successfully.
hope you got the main concept.