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Azure function v4 migration. Could not load file or assembly 'Microsoft.Extensions.Configuration.Abstractions, Version=7.0.0.0, Culture=neutral

I'm currently migrating an Azure Function from v2 to Azure Functions v4. I already migrated my project to .NET6 and fixed all the package reference errors. I have in the solution 3 projects which I adjusted to .NET6 and Azure Function v4. For that I edited the .csproj files of each of those projects and upgraded/substituted packages which are not working with .NET6. The project file of each project looks like:
Azure Function Project:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
<AzureFunctionsVersion>v4</AzureFunctionsVersion>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Azure.Messaging.ServiceBus" Version="7.11.1" />
<PackageReference Include="Azure.Messaging.EventHubs" Version="5.7.5" />
<PackageReference Include="DocumentFormat.OpenXml" Version="2.18.0" />
<PackageReference Include="Microsoft.Azure.WebJobs" Version="3.0.33" />
<PackageReference Include="Microsoft.Azure.WebJobs.Extensions.EventHubs" Version="5.1.2" />
<PackageReference Include="Microsoft.Azure.WebJobs.Extensions.ServiceBus" Version="5.8.1" />
<PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
<PackageReference Include="Microsoft.Extensions.Azure" Version="1.6.0" />
<PackageReference Include="Microsoft.Extensions.Configuration" Version="7.0.0" />
<PackageReference Include="Microsoft.Identity.Client" Version="4.48.1" />
<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.1.3" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\PCM.1.z\x.1.z.csproj" />
</ItemGroup>
<ItemGroup>
<Compile Update="2.cs">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Compile>
<Compile Update="1.cs">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Compile>
<Compile Update="3.cs">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Compile>
</ItemGroup>
<ItemGroup>
<None Update="host.json">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="local.settings.json">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</None>
</ItemGroup>
</Project>
Second Project:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Azure.Messaging.ServiceBus" Version="7.11.1" />
<PackageReference Include="Azure.Messaging.EventHubs" Version="5.7.5" />
<PackageReference Include="Microsoft.ApplicationInsights" Version="2.21.0" />
<PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
<PackageReference Include="Microsoft.Azure.Devices" Version="1.38.2" />
<PackageReference Include="Microsoft.Azure.WebJobs" Version="3.0.33" />
<PackageReference Include="SendGrid" Version="9.28.1" />
<PackageReference Include="StackExchange.Redis" Version="2.6.80" />
<PackageReference Include="Twilio" Version="6.0.1" />
<PackageReference Include="UnitsNet" Version="4.149.0" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\x.1.w\x.1.w.csproj" />
</ItemGroup>
</Project>
Third Project:
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="7.0.0" />
</ItemGroup>
</Project>
When I build the project I got no errors. But when I debug the project I got an exception which looks like:
Exception:
Exception thrown: 'System.IO.FileNotFoundException' in Microsoft.Azure.WebJobs.Host.dll.
An exception of type 'System.IO.FileNotFoundException' occurred in Microsoft.Azure.WebJobs.Host.dll but was not handled in user code
Could not load file or assembly 'Microsoft.Extensions.Configuration.Abstractions, Version=7.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.
I have tried the last two weeks different packages since when I googled this error, the suggestion was to see which packages are not supported by package:
<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.1.3" />. I analyzed all my packages. After changing them back and force I got still the same error.
Can anyone help me and say what exactly I have to change?

As #Codebrane said, Microsoft.Extensions.Configuration.Abstractions, Version=7.0.0.0 has the issues in working with Azure Functions v4 Version and it has been shown practically in this thread.
Try by downgrading the Microsoft.Extensions.Configuration.Abstractions to Version 6.0.0 and check.
Microsoft.NET.Sdk.Functions depends on the NuGet Packages related to the Code but these can be suggested by VS IntelliSense and installed automatically, or it shows these packages required.
Also, NuGet Packages varies between In-Process and Out-of-Process worker type in Azure Functions. Refer to one of my threads for more information.

I am building an Azure function as v4 in net6. Since I also got the System.IO.FileNotFoundException regarding library Microsoft.Extensions.Configuration.Abstraction 7.0.0 when starting up the function,
I downgraded to Microsoft.Extensions.Configuration.Abstractions 6.0.0 and also had to downgrade other dependencies such as Microsoft.EntityFrameworkCore to 6.0.12 and, since I am using PostgreSQL also Npgsql.EntityFrameworkCore.PostgreSQL to 6.0.8. Now everything works.

I fixed it by including the package Microsoft.Extensions.Configuration.Abstractions 6.0.0 and building it. To include this package doesn't solve the problem directly it just shows which packages have a conflict. By downgrading these conflicting packages the project could be debugged. To check which packages are conflicting you have to open up the packages on the right side in visual studio and look where is a exclamation mark. Then you have to analyze these packages to know on what version you have to downgrade them. It changes from project to project.

Is it possible to use the same version for multiple dependencies in a csproj file?

I have a C# project (.NET6) that looks like this:
project.csproj
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net6.0</TargetFramework>
...
</PropertyGroup>
...
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="6.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="6.0.0" />
...
</ItemGroup>
...
</Project>
Is it somehow possible to maintain these dependency-versions in one place (they all belong together)?
Similar to what e.g. Maven allows by using a property?
The problem is that when I want to update - e.g. to 6.0.1 - I always have to update all dependency-versions at once. Which is in particularly a problem when using automatic tools like Dependabot as they usually create one pull request for each dependency because they are unable to recognize that these dependencies belong together.
I also checked but I didn't find any other solutions so far, neither on StackOverflow nor in the Microsoft docs.

Yes, that works. Just use a variable for the versions.
Like so:
<PropertyGroup>
<EntityFrameworkVersion>6.0.0</EntityFrameworkVersion>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore" Version="$(EntityFrameworkVersion)" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="$(EntityFrameworkVersion)" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="$(EntityFrameworkVersion)" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="$(EntityFrameworkVersion)" />
...
</ItemGroup>
Now you only have to edit a single line to update the version. I normally even move the variable definition to the top-level Directory.build.props file, so that I only need to edit one single line to update the version across all projects in the solution.
There are two possible problems with this solution:
I'm not sure (and never really tested) whether dependabot is able to resolve this. It might not be.
From experience, when the solution is large (many projects that have this dependency) updating the Directory.build.props file often crashes Visual Studio. When closing it before changing the version, everything is fine, though.

Firstly, you can simplify your references because the other 2 are dependencies and will be automatically included.
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.0" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="6.0.0" />
</ItemGroup>
If you did want them to share the version, you can define a property for the version:
<PropertyGroup>
<EfVersion>6.0.0</EfVersion>
<PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="$(EfVersion)" />
<PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="$(EfVersion)" />
</ItemGroup>
However, I wouldn't recommend this - as soon as you use any tooling (like the Nuget Package Manager) to update these references, you will likely run into problems (from memory it will replace the EfVersion with the concrete version, but that will be a tool-specific implementation detail).

Extract git branch name while building C# project

While building the C# project locally/CI server, I wanted to control the NuGet package reference in the .csproj file. If the developer is building a C# project on github master branch (locally/CI server) I would like to add RC build NuGet package reference otherwise PRE releases NuGet package reference. How to do this? Can someone please assist me?
Some thoughts like -
<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net5.0</TargetFramework>
<GitBranch>$(GitBranch.Trim())</GitBranch>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="GitInfo" Version="2.2.0" />
</ItemGroup>
<Choose>
<When Condition="$(GitBranch) == 'master'">
<ItemGroup>
<PackageReference Include="Data.Account.Domain.Messaging" Version="1.0.0-rc*" IncludePrerelease="true" />
</ItemGroup>
</When>
<Otherwise>
<ItemGroup>
<PackageReference Include="Data.Account.Domain.Messaging" Version="1.0.0-pre*" IncludePrerelease="true" />
</ItemGroup>
</Otherwise>
</Choose>
</Project>

You could read the git branch from the .git/HEAD file. Naive implementation like
<PropertyGroup>
<GitBranch>$([System.IO.File]::ReadAlltext('$(MsBuildThisFileDirectory)\.git\HEAD').Replace('ref: refs/heads/', '').Trim())</GitBranch>
</PropertyGroup>
You might want to adjust how you get the path to that file, and perhaps use something more robust (e.g. if you just checkout a random commit in git, the file won't contain a branch name but a commit SHA)

You could also use variable $(GitRoot) from GitInfo itself to build the path, just a small adaption to the existing code but helped for my case where I had to deal with nested folders.
<PropertyGroup>
<GitBranch>$([System.IO.File]::ReadAlltext('$(GitRoot)\.git\HEAD').Replace('ref: refs/heads/', '').Trim())</GitBranch>
</PropertyGroup>

One or more compilation references may be missing

I just added Microsoft.AspNet.MVC to my project and used Html.RenderAction to render a partial view however on compile im getting this message : One or more compilation references may be missing.
Here us how the .csproj looks:
<Project Sdk="Microsoft.NET.Sdk.Web">
<PropertyGroup>
<TargetFramework>netcoreapp2.2</TargetFramework>
<AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
</PropertyGroup>
<ItemGroup>
<PackageReference Include="Microsoft.AspNet.Mvc" Version="5.2.7" />
<PackageReference Include="Microsoft.AspNetCore.App" />
<PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.2.0" PrivateAssets="All" />
<PackageReference Include="MySql.Data.EntityFrameworkCore" Version="8.0.18" />
</ItemGroup>
</Project>
and the offending line #Html.RenderAction("MenuItems") MenuItems exists and has a MapRoute
I am using VSCode, so I may just not understand how to do a particular thing since it doesn't have the inbuilt project management that VStudio has.

I added an old version of MVC to my project to get MVC.Html helpers. I didn't need to do this.
RenderAction is deprecated and so is Action.

WCFMetadata tag in ItemGroup of silverlight project file

This line appears in my Silverlight application cs.project file.
<ItemGroup>
<WCFMetadata Include="Service References\" />
</ItemGroup>
Just wondering if anyone know anything about how it works and why it is there.
Thank you.

When you right click on the Service References node in the Solution Explorer and Pick the Add Service Reference.. you can add a Service reference to your silverlight project. You will see some additional node in your csproject and under teh Service References folder you will see bunch of auto-generated files that help you connect easily to the service and invoke methods
Then your project will look something like this
<ItemGroup>
<WCFMetadata Include="Service References\" />
</ItemGroup>
<ItemGroup>
<WCFMetadataStorage Include="Service References\ServiceReference1\" />
</ItemGroup>
<ItemGroup>
<None Include="Service References\ServiceReference1\Foo-Web-Services-Bar.disco" />
</ItemGroup>
<ItemGroup>
<None Include="Service References\ServiceReference1\configuration91.svcinfo" />
</ItemGroup>
<ItemGroup>
<None Include="Service References\ServiceReference1\configuration.svcinfo" />
</ItemGroup>
<ItemGroup>
<None Include="Service References\ServiceReference1\Reference.svcmap">
<Generator>WCF Proxy Generator</Generator>
<LastGenOutput>Reference.cs</LastGenOutput>
</None>
</ItemGroup>
Yours is empty because you haven't added any service references

From my experience, these lines appears in a csproj when you try to add a reference to a WCF Service
Right click on the project name
Select 'Add reference to service' (I use a non english VS, so it
could be something similar)
From the state of your lines, I think that you don't have any reference active.
But VS has already created the subfolder where it will store every files needed to define future references. (Look at your project folder and you will find the folder 'Service References'