I have a .NET core 2 project cloned on my newly bought Laptop (running on Win10). I have installed VS Community 2017 along with .Net core 2 framework. When I load the solution, I have working on my old PC, I got dependency errors marked with a yellow triangle in the solution explorer. These are two types:
Microsoft.Extensions.Primitives 2.0.0-preview1-final depends on System.Runtime.CompilerServices.Unsafe (>= 4.4.0-preview1-25219-04) but System.Runtime.CompilerServices.Unsafe 4.4.0-preview1-25219-04 was not found. An approximate best match of System.Runtime.CompilerServices.Unsafe 4.4.0-preview1-25305-02 was resolved.
Package 'librdkafka.redist 0.11.1' was restored using '.NETFramework,Version=v4.6.1' instead of the project target framework '.NETCoreApp,Version=v2.0'. This package may not be fully compatible with your project.
Apart from these warnings, I have a runtime exception saying:
System.TypeLoadException: 'Could not load type 'Microsoft.AspNetCore.Builder.AuthenticationOptions' from assembly 'Microsoft.AspNetCore.Authentication, Version=2.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.'
I have the AspNet.Security.OAuth.Validation NuGet package referenced with version 1.0.0, which does not look 100% right to me, but it has been working
well so far.
This is the exactly same project as the one working on my old PC, nothing changed.
warnings in solution explorer
Any ideas?
find
PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer.Design" Version="2.0.0-preview1-final"
and remove . then build it.
Related
After adding some nuget packages, my asp.net core app has stopped working and started to generate this error once deployed to Amazon windows server [Works OK on my dev machine (as always :-)].
Visual Studio: 2019
Target Framework: netcoreapp3.1
Installed: dotnet-hosting-5.0.7 + dotnet-sdk-5.0.401
in my deps.json file, the Microsoft.Extensions.Options always appear in the right version (3.1.10) and never in 5.0.0 version.
Any ideas where the problem might come from?
I had similar issue. The error is:
FileNotFoundException: Could not load file or assembly 'Microsoft.Extensions.Options, Version=2.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60' or one of its dependencies. The system cannot find the file specified
The fix: upgrade Microsoft.Extensions.Options in Nuget from version 2.x.x to latest version (version 5.0.0) and delete all obj and bin folders and rebuild.
My projects are on .NET Framework 4.7.2. When Microsoft.Extensions.Options get updated, several other Nuget packages that were also on version 2.x.x also got updated.
After uninstalling most of the Nuget packages and reinstalling them with the right version, the problem was resolved.
I'm getting the runtime error:
InvalidOperationException: Can not find assembly file mscorlib.dll at '...\bin\Debug\net462\refs,...\bin\Debug\net462\'
This had not been a problem until I updated to version 15.3.1 this morning, and installed the .Net Core 2.0 SDK.
The DLL's are present in my ~\.nuget\packages folder. I'd had the same issue with the "Microsoft.Csharp.dll" assembly until I copied and pasted it into the stated folder.
I tried specifying to use .Net Core 1.1.0 via a global.json file, but then I get the build error:
The version of Microsoft.NET.Sdk used by this project is insufficient to support references to libraries targeting .NET Standard 1.5 or higher. Please install version 2.0 or higher of the .NET Core SDK.
This error goes away if I clean the solution then restore Nuget packages via Command Line- not via the GUI. However it comes back if I change the version of a nuget package.
OK, this seem slightly different to my issue here: Visual Studio update 2017 15.3.1 forces ASP.NET Core SDK 2.0, which then doesn't find "reference assemblies"
If you install the SDK 2.0 from https://www.microsoft.com/net/download/core
You will then "probably" be able to build and run the project again but you'll be back to having the missing Microsoft.CSharp.dll / mscorelib.dll error.
If you then make sure the dependency is correct for the netstandard version:
<DependsOnNETStandard>netstandard1.5</DependsOnNETStandard>
See here: https://learn.microsoft.com/en-us/dotnet/standard/net-standard for the right version for you. My project is using core 1.1 targeting the full framework 4.6.1 and targeting netstandard1.6 has worked for me.
The final piece of the puzzel, was found on the GitHub issues here: https://github.com/dotnet/sdk/issues/1488
Add the following to your references in the .csproj file:
<PackageReference Include="Microsoft.Extensions.DependencyModel" Version="2.0.0" />
This will then build the project as a 1.1 project, but using the 2.0 SDK (which from what I can tell, it's supposed to do!). I can now run the project, update packages and generally got on with my work!
I just upgraded my TFS source to use DevExpress 15.2.5. However, now I get a bunch of warnings in the output such as
C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets(1819,5): warning MSB3274: The primary reference "C:\Users\User1\Source\Release\V6.1\CommonBin\Release\WebControls.dll" 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=v3.5".
and
C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVersion.targets(1819,5): warning MSB3275: The primary reference "C:\Users\User1\Source\Release\V6.1\CommonBin\Release\WebControls.dll" could not be resolved because it has an indirect dependency on the assembly "DevExpress.Data.v15.2, Version=15.2.5.0, Culture=neutral, PublicKeyToken=7ea533hgx2169hs3" which was built against the ".NETFramework,Version=v4.0,Profile=Client" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v3.5".
along with about 30 other similar warnings.
It's obvious that something is out of sync with my assemblies because they are referencing the wrong versions. So I looked at my TFS project .csproj file. The version of DevExpress and .NET framework that are being referenced in there are correct.
I then went to the Microsoft.Common.targets file and opened in Notepad. I noticed that file is referencing the old version of everything. How do I get this in sync with my TFS assemblies?
It looks like you need to change your project to use the .NET framework version 4.5 on the project properties page:
Word of warning this may result in more warnings or errors depending on the .NET APIs you use.
In Visual Studio 2012 I created an ASP.NET MVC 4 project where the target framework is the .NET Framework 4.5. When I deployed my project to a web server it gave the following error:
Could not load file or assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file
specified.
Description: An unhandled exception occurred during the execution of the current web request.
Please review the stack trace for more information about the error and where
it originated in the code.
Exception Details: System.IO.FileNotFoundException: Could not load file or
assembly 'System.Web.Http.WebHost, Version=4.0.0.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35' or one of its dependencies.
The system cannot find the file specified.
Source Error:
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34237
I had the same issue today during deployment. I was able to fix it by marking the assembly to be copied to the deployment file.
In order to do this, in my Visual Studio project, select the System.Web.Http.Webhost assembly in your references and alter the 'Copy Local' property to True. I had to repeat this for a few other assemblies that were missing.
Thanks to this website for the tips - http://haacked.com/archive/2008/11/03/bin-deploy-aspnetmvc.aspx/
Check the bin folder of your deployed project. It should contain System.Web.Http.WebHost.dll.
If this dll is in this folder, check it version. If it isn't 4.0.0.0, then you should deploy version 4.0.0.0 or change your web config to use other version (not really good idea because of dependencies)
Try to reinstall Microsoft.AspNet.WebApi package. Open Package Manager Console and type:
Update-Package Microsoft.AspNet.WebApi -reinstall
Be careful, this command will remove all dependencies and you will have to install them manually.
I had this error with an old project that I was going back to do a bit of work on. It turns out the project wasn't actually using WebApi so I uninstalled Microsoft.AspNet.WebApi using NuGet. That solved the problem for me.
If I'd actually have needed WebApi I'm sure installing it again would have fixed the error too.
I ran into this today after setting up a new Team City Build Agent. The new agent didn't have MVC 4 installed, perhaps part of the problem. Fortunately, I found this article which lead me to the solution. In Team City, I just updated the Build Step for the Nuget Restore so that it doesn't use the local cache.
This works because the cache may have been established by build runners with different (MVC) frameworks installed already.
I know this is answered but I thought I'd add something.
Every time I set "copy local" to true on a file causing the error I'd publish it and just get another one. So I just selected all of the files under references and set them all to true. This fixed the issue for me.
Important: This error message can be caused because you are deploying a 4.5 project to a server that doesn't have 4.0 installed. Make sure you have the .NET Framework version installed in IIS for the project you need. Some of these DLLs by default won't copy up, because it uses the core project DLL normally. Check to make sure your production server has the .NET version you're going with. I experienced this myself with a 4.5 project on a 4.0 server.
Ensure ASP.NET MVC 4 is installed on your server. Check it in the following location -
C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4
I just installed Ninject.MVC5 into my solution (I have an MVC project and a WebApi project in there and I wanted Ninject for both).
Then I installed WebApiContrib.IoC.Ninject to build on the previous install so that I could use Ninject in the WebApi package.
Then I updated the packages (because NuGet showed updates to install - even though I had updated the packages directly prior to installing Ninject).
I tried running my WebApi project but it failed on var kernel = new StandardKernel(); in NinjectWebCommon.CreateKernel() with this error:
An exception of type 'System.IO.FileNotFoundException' occurred in Ninject.dll but was not handled in user code
Additional information: Could not load file or assembly 'System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.
Having read several answers on here and contemplated certain relatively complex solutions I tried one more thing which I will share in the Answer in case it helps anyone else...
I removed WebApiContrib.IoC.Ninject from the WebApi project (via NuGet: Manage and then untick to remove) and then added it back.
Project runs and behaves as expected, and no updates are required after adding WebApiContrib.IoC.Ninject back in to WebApi project.
The update that NuGet identified as required overwrote/broke something that was fixed by this answer.
Add the package Microsoft.Aspnet.Mvc from Nuget.
Solved for me.
In my case, MVC4 for Framework 4.0 and Visual Studio 2017