I made an application using c#.net 2.0 and linq but as we can't use Linq cause it was introduced in framework 3.5, i add some references of dll of version 3.5 and linq started working fine.
when i made the setup and installed it, it is working fine on my system but on other system it is showing error that
Unable to load System.Data.DatasetExtensions
I don't know that if other dlls are working then why this dll is creating problem? What is the solution for this?
Needs Help.Thanks.
If you are constrained to using .Net2.0, then don't bother trying to load assemblies targeting later versions of .Net. It's doomed to failure. If you want to use Linq, target >=.Net3.5, if you need to target .Net2.0, don't use Linq.
Regarding error, the assemblies that you added may be having dependencies on other assemblies. It didn't give error on your system because you had it installed on it.
But you shouldn't be doing such a thing in general. A better way would be installing the required framework version within your installer as a pre-requisite requirement.
Related
I am trying to update a large solution to .NET Framework 4.7.2 with VS2019. One of the problems with this solution is that it is a large plugin type architecture, where (for many reasons) I am not able to recompile and release the plugins to production with the updated shared set of libraries that the solution provides.
Normally this is OK, but we have to be very careful to ensure full backwards binary compatibility. When we recently upgraded to .NET 4.7.2, we started getting conflicting usage indicators between System.Linq and MoreLinq, generally on the .ToHashSet() extension that we commonly use. The problem is outlined somewhat on MoreLinq's github
I think the only way to correct this is to isolate MoreLINQs usage into a single DLL that I control, and once all plugins reference that DLL upgrade to 4.7.2, fixing the .ToHashSet() call in the common location at that time.
Does anyone know of a better/more efficient way to do this, without re-releasing all the plugins at once? Some kind of global redirect that I am not aware of?
Evidently this just works. Installing the solutions common DLLs # 4.7.2 alongside older plugins # 4.5.2 worked fine, even though those plugins had compilation errors when compiling in Visual Studio against 4.7.2.
I'd be curious to know what internals are making this succeed. Does the system load multiple versions of .NET framework DLLs for the running process?
I'm in C# in Visual Studio running 2015 Update 3.
I'm using a dll that I made myself for the backend of a system, and in the references of the project, one shows the "System" as Version 2.0.5 and the project being used as a dll shows it as 4.0.0. I believe this is the cause of a conflict that is preventing me from running this app. How do I update just the system version or even specify it so I can make them the same?
I think you should go to the references of your project containing the old reference, remove System and add it with version 4.0.0.0. However, you should also check that target .NET framework versions match (maybe the older dll is obtained compiling against .NET framework 2.0 and the newest one against .NET framework 4.0).
In order to find out the cause that is preventing you from running the application (you should provide what is happening), an useful tool is Assembly Binding Log Viewer which will show the exact assemblies that the application is trying to load (fully qualified assembly names).
I have to use Gabor Filter on image in Unity. Accord.net have it. I download libs for .net3.5 but i got reflection problem
link to accord.net
Internal compiler error. See the console log for more information. output was:
Unhandled Exception: System.Reflection.ReflectionTypeLoadException: The classes in the module cannot be loaded.
i use options changings from subset to .net 2.0 but still nothing.
https://github.com/accord-net/framework/releases
i have to use probably only accord.dll and accord.imaging.dll
what i have to do? Any solutions?
You have to manually resolve the dependencies, like this:
I got Accord DLLs using NuGet, and drag-and-dropped them into Unity from "packages/Accord??/lib/net35". (This means DLLs were built for .NET 3.5.) Maybe you can use manually built DLLs for .NET 3.5.
For Mac OSX, System DLLs can be obtained from
"/Applications/Unity/Unity.app/Contents/Frameworks/Mono/lib/mono/2.0".
I've a C# class with CorePoll namespace, I compiled it to .DLL file and put it inside bin folder of website. But I cannot use it. Imports CorePoll returns Could not load file or assembly 'CorePoll' or one of its dependencies. An attempt was made to load a program with an incorrect format.
It's my class file in C# http://pastebin.com/JkdrnXyT
The message An attempt was made to load a program with an incorrect format., typically comes from mixing 64/32 bit environments. When you build your .DLL, make sure to select Any CPU as the Target CPU int the build settings. That way, the DLL should work no matter if the website is running 32 or 64 bit. But be aware, the message also states Could not load file or assembly 'CorePoll' or one of its dependencies., meaning that if you've referenced other libraries in your DLL, they could be failing to load as well.
Edit: After looking at the documentation, another potential cause of this exception is mixing projects built with different versions of the .Net Framework. Is this possibly causing your error?
Components have been created using different versions of the .NET Framework. Typically, this exception occurs when an application or component that was developed using the .NET Framework 1.0 or the .NET Framework 1.1 attempts to load an assembly that was developed using the .NET Framework 2.0 SP1 or later, or when an application that was developed using the .NET Framework 2.0 SP1 or .NET Framework 3.5 attempts to load an assembly that was developed using the .NET Framework 4. The BadImageFormatException may be reported as a compile-time error, or the exception may be thrown at run time.
None of answers helped me, I converted the C# code to VB.NET and used it with no problem, thanks for your time.
I can't find a template for a linq to sql class in .net 2.0 project, based on what i know you can work with linq in .NET 2.0 as long as you have 3.5 in your development machine and ship system.core.dll with your application?
so based on that how can I add a Linq to Sql model to my project when "Linq to Sql Classes" template is missing from the add new item window?
Edit:
Just to clear things up, This is a server application and the server will have .net 3.5 SP1. the only issues is that we can not upgrade the project to .net 3.5 at the moment.
If you ship System.Core with your application, it won't pick up future security fixes and won't have the optimized build installed (MS internally uses and profiling NGEN for distributed framework libraries). Either require .NET 3.5, avoid using Linq, or implement your own extensions for a custom Linq provider.
The approach you are taking is dangerous and will almost certainly lead to errors on your deployment machine.
The 3.5 framework, and specifically System.Core.dll, rely on the CLR being at least 2.0 SP1. There are several bugs in CLR 2.0 that are exposed by the use of the expression tree API and other code which Linq2Sql relies upon.
If you ship System.Core.dll only the clients are not guaranteed to have, and likely won't have, the CLR service pack. Hitting any of these bugs will result in hard to understand failures in your application.
You may get lucky for awhile but this is an untested and unsupported scenario.
I highly advise you to not do this
Try adding a reference to System.Core
http://iformattable.blogspot.com/2008/05/using-linq-from-net-20.html
I figured it out, All you have to do is add a new text file to the project, but change the extension from .txt to .dbml and it'll automatically be picked up by visual studio. it will even generate all the code behind for you.