I have a .NET application that I built in 4.5, which has references to a bunch of libraries that were built in 4.5, which themselves have references to 4.5, etc. A user group that I'm trying to distribute the application to is having problems running the executable because they have 4.0 installed; in particular, they're getting a MissingMethodException:
Method not found: 'System.Type System.Runtime.InteropServices.Marshal.GetTypeFromCLSID(System.Guid)'.
Because we may have trouble getting each user upgraded to 4.5 (as none of them have admin permissions on their machines and this would require a separate upgrade request for each user), I'm looking at finding an easy way to rebuild the project as 4.0. This seems to require that I rebuild every library and its referenced libraries in 4.0; is there an easier way to do this than going through each library one by one and building a 4.0 version? I'm thinking maybe like a one-click option for "Rebuild all referenced libraries in target framework" or something like that.
If you have dependencies on .Net 4.5 DLLs then you will need to also get .Net 4.0 versions of those if you want to successfully downgrade your project. A .Net project can only reference .Net DLLs up to the same version of .Net as the referencing assembly.
The easiest way to do this is to use something like NuGet to manage your dependencies. Note that when you change the target framework version of your project in VS you will need to uninstall and re-install dependencies with NuGet as NuGet does not automatically do this for you when you change the target framework version.
Of course if all the dependencies are to your own code and you aren't publishing this through a dependency management system like NuGet you will need to downgrade all your other code to .Net 4.0 as well
When I use Visual Studio, I right click on the project, change the framework, fix the References and recompile. Usually straight forward.
Please, have a look at this MSDN page to correctly switch your project to a lower target framework without problems! It is a little bit outdated for what concerns versions, but the process is the same described!
This is based on my experience. I had an application initially created in .net framework 4.5 but I wanted to convert it in .net framework 4.0. I created new project initially created 4.0 and then I did copy and paste of all the forms and controls of my previous application and it works. Framework 4.5 is using Aero2 and 4.0 is Aero... Good Luck :)
Related
I am doing maintenance work on a VS2010 C# project built against .net v3.5.
I recently changed the project Target Framework properties to the latest version listed (v4) - due to an expectation of using a version of .net that is actually included in Win10 by default - and rebuilt without any apparent issues.
Unfortunately the embedded dependency in the generated .exe is still for .net v2.0.50727 (which is what is reported for v3.5 AFAIK) and the target machine (a clean install of Win10) is asking to install .net 3.5.
Using MS VS2010 v10.0.40219.1 SP1Rel.
Unfortunately upgrading the build tools isn't an option (building the program with VS2015 works just fine).
I have gone googling but don't seem to have found any similar reports.
Based on some of the comments already posted, I seem to have not made myself entirely clear - hopefully the following will help.
1) the intention/requirement is to be able to install this app on a clean install of Win10 without needing any further downloads. (installing .net 3.5 is easy to do, just not what is wanted)
2) the ultimate build environment for this is automated, visualized and not in my control and therefore upgrading the tool chain is a major pain that I'd like to avoid if possible.
3) AFAIK there are no third party libraries involved. All of the listed references (dll's) are v4.0.30319.
4) this is a XAML-based development, one part of three projects in the solution - the other entries are the installer and a C# custom installation library. As far as I can tell everything is set for .net v4.
Unfortunately the embedded dependency in the generated .exe is still for .net v2.0.50727 (which is what is reported for v3.5 AFAIK) and the target machine (a clean install of Win10) is asking to install .net 3.5
So there is some dependency in your project that targets that version of .NET. It could just be that you need to Build > Clean Solution and with a Build > Rebuild Solution the problem is solved.
Otherwise, assuming some library does require some .NET 3.x library, the installation request is entirely correct. Windows 10 does not have an option for installing .NET 2.0 and another for installing .NET 3.5. If you search for Turn Windows features on or off you will see this:
Any dependency on a .NET 2.x-3.x library will trigger the activation/installation of the first feature in the dialog.
As far as I can see, you have 2 options:
Move everything to a framework supported by Microsoft, most preferably .NET 4.7.2 given support and security.
Deal with the installation process and understand that Microsoft does not install these versions of .NET in purpose. You can, however, add these installers as a prerequisite and even bundle them with your installation, but that won't help much.
Thanks to all who have tried to help me!
The issue has been resolved.
There appear to have been two causes for this issue and my confusion:
it turns out that the blank install of Win10 that the testing was being performed on was not entirely clean - the pre-installed network drivers/utilities from intel also had a .Net v3.5 dependency...
one of the embedded resources in the project was effectively a uncompressed tar-ball containing a number of files; including an executable that had the dependency on .net v3.5 - this was a binary blob stored in svn so the content was had not been updated for several years (ie well before my involvement) ...
With both of these issues addressed it would appear that my problem is solved, so once again thank you for your feedback, suggestions and patience,
PeterT :->
Recently I started learning how to create Dynamic Link Libraries in Visual Studio with C#.
I followed online instructions on how to create DLLs:
https://learn.microsoft.com/en-us/dotnet/core/tutorials/library-with-visual-studio
http://www.c-sharpcorner.com/UploadFile/1e050f/creating-and-using-dll-class-library-in-C-Sharp/
https://blogs.msdn.microsoft.com/benjaminperkins/2017/04/13/how-to-make-a-simple-dll-as-an-assembly-reference-just-for-fun/
After completing these steps, I tried to add my .dll file to my projects.
On execution I receive this message:
System.IO.FileNotFoundException: 'Could not load file or assembly
'MySql.Connect, Version=1.0.0.2, Culture=neutral, PublicKeyToken=null'. The
system cannot find the file specified.'
I selected .NET Framework 4.6.1 when I started my project. The target framework in the Properties file under the Application tab is selected as .NET Framework 2.0.
The project that should reference to the file is targeting the .Net Core 2 Framework.
I've been at this problem for nearly a week and searched for online solutions.
Any help will be greatly appreciated.
You need to put the DLL somewhere that the runtime can find it. The easiest thing to do would be to put it in the same directory as the .exe, but you have other options as well (see How the Runtime Locates Assemblies).
It is important to carefully decide what platform you intend to use your DLL with.
I selected.NET Framework 4.6.1 when I started my project.
If you mean when you started your DLL project, then you have limited the types of applications that can consume this DLL to .NET Framework 4.6.1+.
Properties file under the Application tab is selected as .Net Framework 2.0.
If I understand correctly, you changed the DLL target from .NET Framework 4.6.1 to .NET Framework 2.0. This widens the compatibility so that the consuming library can be .NET Framework 2.0+. However, this is at the expense of all of the newer features of the .NET Framework.
Do note that official support (i.e. patches) for .NET Framework 2.0 has been gone for several years, and newer machines aren't likely to have it installed.
The project that should reference to the file is targeting the .Net Core 2 Framework.
Here's the crux of your issue. .NET Core ain't .NET Framework. It is a completely different platform.
That said, .NET Core has some limited support for referencing .NET Framework assemblies, but is it sure not to work with .NET Framework 2.0 (which again, hasn't been supported in years). Also, this "compatibility mode" probably means you lose cross-OS support, which is one of the main benefits of .NET Core.
Option 1
So, the knee jerk answer is to make your DLL target .NET Core if you want to use it with .NET Core applications.
Option 2
However, there is also an option to make a portable DLL that works with .NET Framework 4.5+ and .NET Core - make your DLL target .NET Standard.
See How to port from .net framework to .net standard for instructions on changing your DLL to target .NET Standard.
I have built a C# class library on the .Net framework 4.5.1. I am using the Json.Net library. However I would to have the same class library be compiled for at least .Net 2.0, 3.5 and 4 and packaged as nuget package. The reason why I am saying that is the only thing that change is the Json.Net because it is built to run on different .Net platform. I have read many suggestions online. However I would like to have a step by step guidance to put this up and running.
So far what I have done is to create various projects and change the target framework and build them to get the dll. Now I would like to have it in one if it is possible.
I have a program in C# that was developed on a PC that has several of installed .NET frameworks, Service Packs, etc. How can I understand what are the minimal installation requirements in order to distribute the program to users? Should I start with a clean PC and test one-by-one .NET frameworks or is there a better approach?
Start by looking at the .NET version that your application is targeting.
If for example, you are targeting .NET 3.5 you will need to also include .NET 2.0
.NET 4.0 and 4.5 are self contained, so including earlier versions is not necessary for them.
You can check the version that you are targeting by going to the properties of your project (right click, properties in the solution explorer), clicking on the Build tab and looking for Target Framework
Microsoft recommends that you look for features that your application requires in the operating systems rather than look for which version of Windows you are targeting. So its better to list those out and tackle them one by one. I find this to be a bit overkill sometimes, but it does help once you get to logo certification.
check Target Framework in your Project Properties
Note :- Step for open project Solution
(Open Your Project in Visual Studio and then open solution explorer and Right click on Properties)
Some link to more Help you
1 : Retrieve Target Framework Version and Target Framework Profile from a .Net Assembly
2 : How to find the .NET framework version of a Visual Studio project?
I'm trying to integrate SharpVoice, which is targeting .NET 3.5 into an existing project targeting 4.0 Client Profile and I'm getting an error where it cannot find the namespace of SharpVoice.
The type or namespace name 'SharpVoice' could not be found
I read online that it could be because they are targeting different .NET versions, but when I try to change the SharpVoice target to .NET 4.0 Client Profile, I get a bunch of errors.
I also read that it is possible to integrate older versions of .NET in the newer ones, but it's not working.
Has anyone come across this problem and how did you fix it?
Found it.
SharpVoice references System.Web (here, line 7) which is only available in the full framework. Client Profile doesn't allow that.
So, you have two choices. Either rework SharpVoice to no longer have a dependency on System.Web OR retarget your main application from Client Profile to instead use the full framework.
I think the second option is going to be far easier to do as removing System.Web appears to require a complete rewrite of that code. Note that changing your main app to use the full framework means you can leave the original google code in .net 3.5.