I had to downgrade my program from .NET 3.5 to 3.0. What I did was go properties->application and change the "Target Framework" from 3.5 to 3.0. is this the correct step? now I get warnings:
I only have this
using System;
using System.Collections.Generic;
using System.Collections;
using System.Text;
using System.IO;
but yet I get this
Warning 1 The primary reference "System.Core", which is a framework
assembly, could not be resolved in the currently targeted framework.
".NETFramework,Version=v3.0". To resolve this problem, either remove
the reference "System.Core" or retarget your application to a
framework version which contains "System.Core". ProgName1
Warning 2 The primary reference "System.Xml.Linq" could not be
resolved because it has an indirect dependency on the framework
assembly "System.Core, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089" which could not be resolved in the
currently targeted framework. ".NETFramework,Version=v3.0". To resolve
this problem, either remove the reference "System.Xml.Linq" or
retarget your application to a framework version which contains
"System.Core, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089". ProgName1
Warning 3 The primary reference "System.Data.DataSetExtensions" could
not be resolved because it has an indirect dependency on the framework
assembly "System.Core, Version=3.5.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089" which could not be resolved in the
currently targeted framework. ".NETFramework,Version=v3.0". To resolve
this problem, either remove the reference
"System.Data.DataSetExtensions" or retarget your application to a
framework version which contains "System.Core, Version=3.5.0.0,
Culture=neutral, PublicKeyToken=b77a5c561934e089". ProgName1
Warning 4 The primary reference "System.Xml.Linq", which is a
framework assembly, could not be resolved in the currently targeted
framework. ".NETFramework,Version=v3.0". To resolve this problem,
either remove the reference "System.Xml.Linq" or retarget your
application to a framework version which contains
"System.Xml.Linq". ProgName1
Warning 5 The primary reference "System.Data.DataSetExtensions", which
is a framework assembly, could not be resolved in the currently
targeted framework. ".NETFramework,Version=v3.0". To resolve this
problem, either remove the reference "System.Data.DataSetExtensions"
or retarget your application to a framework version which contains
"System.Data.DataSetExtensions". ProgName1
The warnings are telling you that those five assemblies are new to .Net 3.5 and cannot be referenced from .Net 3.0.
Just delete those references.
It seems you are using Extension methods extensivly and this is one of the main reasons you're getting most of these errors.
You need 3.5 for extension methods.
Related
My project called 'Gui Tester' has a microsoft.windowsdesktop.App.WindowsForms framework version 6.0.0. In addition, it has a project reference to WinForms class called 'WinFormsLibrary3' which its framework version 6.0.9. This causes the error below. How do I make both versions the same in order to solve this issue? I was unable to find a way to remove/add/update a framework.
A link to a sample solution (\AssemblyError\GuiTester\GuiTester.sln) can be found here - https://1drv.ms/u/s!AuZvh6FckScbhMpi02_Dm-YCBE00ew?e=KKNyLi
Error CS1705 Assembly 'WinFormsLibrary3' with identity 'WinFormsLibrary3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' uses 'System.Windows.Forms, Version=6.0.2.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' which has a higher version than referenced assembly 'System.Windows.Forms' with identity 'System.Windows.Forms, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
There is no way your Gui tester project (version 6.0.0) can open your winFormsLibrary3 (version 6.0.9). Since the lower version does not recognize or support a higher version which it never designs for. What you can do is create a new solution of gui tester with a higher version and just copy all the files from the old gui tester into your new gui tester.
As I wrote in the comment, you can try downgrade your target framework, but some times it cause unexpected behaviour
https://ourtechroom.com/fix/how-to-downgrade-net-framework-version-in-visual-studio/
I'm currently migrating my WPF projects from .NET Framework 4.8 to .NET 6 using the .NET Upgrade Assistant as a base and then manually fixing the remaining problems.
All my projects have a shared set of libraries, one of this contains both standard classes and a few custom UserControl. When migrating this particular library to .NET 6 the frameworks referenced by this library are Microsoft.NETCore.App and Microsoft.WindowsDesktop.App. The problem is when I try to use this library in another project I get the following warning:
Warning MSB3277 Found conflicts between different versions of "WindowsBase" that could not be resolved.
There was a conflict between "WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" and "WindowsBase, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35".
"WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was chosen because it was primary and "WindowsBase, Version=6.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" was not.
Looking at the WindowsBase referenced by the two frameworks referenced by the library I see that Microsoft.NETCore.App references WindowsBase v4.0.0.0 while Microsoft.WindowsDesktop.App references WindowsBase v6.0.0.0.
How can I solve this?
I met the exact issue as you when upgrading a csharp project from .Net framework to .Net6.
There are some dependencies under assemblies (such as system system.xml) which directed to the wrong framework path but can not be removed or modified. There was no much information about this issue on csdn so it really took me a while to find the root cause by trial and error, and finally it was the WinFX.Targets file imported in my csproj project file which brough these .net framework dependencies.
The WinFX.Targets file was imported by csproj before upgrading and the importing was deleted by upgrading. It was necessary for the project so I added it back without modification, which caused the MSB3277 build warning.
I started a new .NET Framework 4.7.2 library project. I need to automate PowerShell scripts, but the "framework" tab in Visual Studio's reference adding UI didn't list System.Management.Automation as an option. So I added a reference to this Nuget package:
https://www.nuget.org/packages/System.Management.Automation/7.0.0
Then with this code:
PowerShell ps = PowerShell.Create();
ps.AddScript(#"C:\ps\function.ps1");
ps.AddArgument(1);
ps.AddArgument(2);
Collection<PSObject> results = ps.Invoke<PSObject>();
I get this error about versions of a DLL which I did not directly reference:
Assembly 'System.Management.Automation' with identity 'System.Management.Automation, Version=7.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' uses 'System.Linq.Expressions, Version=4.2.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' which has a higher version than referenced assembly 'System.Linq.Expressions' with identity 'System.Linq.Expressions, Version=4.1.2.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
I'm not sure how to resolve this, and I think maybe I approached adding my PowerShell automation library reference the wrong way. What's the right way to do this currently?
Before you point me at an old answer, I found a similar question about this which points to a different Nuget package, now marked "deprecated" and doesn't look official anyway. That makes me nervous.
https://www.nuget.org/packages/System.Management.Automation.dll/
System.Management.Automation v7.0.0 only works with .NET Core. If your project requires .NET Framework, you must use System.Management.Automation v5.1.x.
I use System.Management.Automation.dll in my .net framework 4.7.2 app.
I just added it via the following reference:
C:\WINDOWS\assembly\GAC_MSIL\System.Management.Automation\1.0.0.0__31bf3856ad364e35\System.Management.Automation.dll
I changed my Asp.Net Core 1.1 application to Core 2.0
This went pretty well but after I updated my nuget packages and I get this error everywhere
The type 'xxx' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.
When I press the button to add an assembly nothing happens. I tried rebuilding and restoring my packages multiple times but it won't work
I think you are having problem with the reference to the old NETStandard version in your class library.
Just make sure you have removed NETStandard reference from all the csproj files in the solution.
I added the following reference to my ASP.NET MVC 4 application using .net 4.0.
I also included the namespace in my Application , but still I see the following error :
Reference : Microsoft.TeamFoundation.Client.dll
C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\ReferenceAssemblies\v2.0\Microsoft.TeamFoundation.Client.dll
"The type or namespace name 'TeamFoundation' does not exist in the namespace 'Microsoft' "
I have another console application and I didnt see this error while using the reference in that application . Is there something different I need to do for a Web/MVC application ?
Please let me know .
There is also this warning I see :
Warning 1 The primary reference "Microsoft.TeamFoundation.Client, Version=12.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" could not be resolved because it was built against the ".NETFramework,Version=v4.5" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v4.0".
You are trying to reference a higher version dll(.net 4.5) in a lower version project (.net 4.0).
Either upgrade your project to .net 4.5 or reference the .net 4.0 version dll.