Error NU1605 Detected package downgrade

问题:

I am experiencing the following NU1605 dependency errors in my netcoreapp2.0 console application:

NU1605  Detected package downgrade: System.Diagnostics.Debug from 4.3.0 to 4.0.11. Reference the package directly from the project to select a different version. 
 MyProject -> Colorful.Console 1.2.6 -> System.IO.FileSystem 4.0.1 -> runtime.win.System.IO.FileSystem 4.3.0 -> System.Diagnostics.Debug (>= 4.3.0) 
 MyProject -> System.Diagnostics.Debug (>= 4.0.11)

NU1605  Detected package downgrade: System.Runtime.Extensions from 4.3.0 to 4.1.0. Reference the package directly from the project to select a different version. 
 MyProject -> Colorful.Console 1.2.6 -> System.IO.FileSystem 4.0.1 -> runtime.win.System.IO.FileSystem 4.3.0 -> System.Runtime.Extensions (>= 4.3.0) 
 MyProject -> Colorful.Console 1.2.6 -> System.Runtime.Extensions (>= 4.1.0)    MyProject

NU1605  Detected package downgrade: System.Runtime.Handles from 4.3.0 to 4.0.1. Reference the package directly from the project to select a different version. 
 MyProject -> Colorful.Console 1.2.6 -> System.IO.FileSystem 4.0.1 -> runtime.win.System.IO.FileSystem 4.3.0 -> System.Runtime.Handles (>= 4.3.0) 
 MyProject -> Colorful.Console 1.2.6 -> System.IO.FileSystem 4.0.1 -> System.Runtime.Handles (>= 4.0.1)

NU1605  Detected package downgrade: System.Runtime.InteropServices from 4.3.0 to 4.1.0. Reference the package directly from the project to select a different version. 
 MyProject -> Colorful.Console 1.2.6 -> System.Console 4.0.0 -> runtime.win.System.Console 4.3.0 -> System.Runtime.InteropServices (>= 4.3.0) 
 MyProject -> Colorful.Console 1.2.6 -> System.Runtime.InteropServices (>= 4.1.0)

I have tried referencing these package versions in csproj, but this doesn't fix the problem. See csproj:

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <RuntimeIdentifier>win10-x64</RuntimeIdentifier>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Colorful.Console" Version="1.2.6" />
    <PackageReference Include="CommandLineParser" Version="2.2.1" />
    <PackageReference Include="DotSpinners" Version="1.2.0" />
    <PackageReference Include="System.Diagnostics.Debug" Version="4.0.11" />
    <PackageReference Include="System.Runtime.Extensions" Version="4.1.0" />
    <PackageReference Include="System.Runtime.Handles" Version="4.0.1" />
    <PackageReference Include="System.Runtime.InteropServices" Version="4.1.0" />
  </ItemGroup>
</Project>

And they do seem to restore fine:

The project is also referencing the Microsoft.NETCore.App 2.0 SDK.

When performing dotnet restore from the CLI, I also get the following error, which I am not sure is related:

C:\Program Files\dotnet\sdk\2.1.200\NuGet.targets(114,5): error : Failed to retrieve information about 'System.Runtime.Serialization.Formatters' from remote source 'https://mycompany.pkgs.visualstudio.com/_packaging/myid/nuget/v3/flat2/system.runtime.serialization.formatters/index.json'. [C:\MyProject\MyProject.sln]
C:\Program Files\dotnet\sdk\2.1.200\NuGet.targets(114,5): error : Response status code does not indicate success: 401 (Unauthorized). [C:\MyProject\MyProject.sln]

I have no idea why it's trying to retrieve information about 'System.Runtime.Serialization.Formatters' from our private company package repository.

NuGet.config:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <packageSources>
    <add key="nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
    <add key="mycompany" value="https://mycompany.pkgs.visualstudio.com/_packaging/Stable/nuget/v3/index.json" />
  </packageSources>
  <packageSourceCredentials>
     <mycompany>
       <add key="Username" value="vsts" />
       <add key="ClearTextPassword" value="xxx" />
     </mycompany>
   </packageSourceCredentials>
  <disabledPackageSources>
    <add key="Microsoft and .NET" value="true" />
  </disabledPackageSources>
  <packageRestore>
    <add key="enabled" value="True" />
    <add key="automatic" value="True" />
  </packageRestore>
  <bindingRedirects>
    <add key="skip" value="False" />
  </bindingRedirects>
  <packageManagement>
    <add key="format" value="0" />
    <add key="disabled" value="False" />
  </packageManagement>
</configuration>

I also have the following NU1603 warning if this means anything:

NU1603  MyProject depends on System.Runtime.Handles (>= 4.1.0) but System.Runtime.Handles 4.1.0 was not found. An approximate best match of System.Runtime.Handles 4.3.0 was resolved.

回答1:

Error NU1605 Detected package downgrade

For the error NU1605:

You can use <NoWarn>NU1605</NoWarn> to clear the WarningsAsErrors in your project.

That because netcoreapp2.0 projects have <WarningsAsErrors>NU1605</WarningsAsErrors> by default. Check it from Properties->Build->Treat warning as errors:

Add like following:

<PackageReference Include="Colorful.Console" Version="1.2.6">
      <NoWarn>NU1605</NoWarn>
</PackageReference>

Check the blog post here: MSBuild integration of NuGet warnings and errors and Unexpected package version warnings.

For the error NU1603:

The warning occurs because System.Runtime.Handles (>= 4.1.0) does not exist in the feed. Typically this is a package authoring error because the package depends on something that doesn't exist.

You can also use <NoWarn>NU1603</NoWarn> to resolve this issue:

<PackageReference>
      <NoWarn>NU1603</NoWarn>
</PackageReference>

Note:You would notice that your project has another warning, notice the yellow triangle insignia on the PackageReference DotSpinners on Reference. That because the package DotSpinners is a .NET Framework project, not compatible with your .NET Core project.

Hope this helps.

回答2:

Make sure that you are using same version for build and publish you can fix it adding 2.1.9 in .csproj file under PropertyGroup this should match with your current settings version. Ex:

  <PropertyGroup>
      <OutputType>Exe</OutputType>
      <TargetFramework>netcoreapp2.1</TargetFramework>    
      <RuntimeFrameworkVersion>2.1.9</RuntimeFrameworkVersion> 
  </PropertyGroup>

Error which I got was: NETSDK1061: The project was restored using Microsoft.NETCore.App version 2.1.9, but with current settings, version 2.1.0 would be used instead.

回答3:

Something that I've run into that causes this error is having multiple references to the same package in one or more .csproj files. In our case, these references are to local dependencies in our own nuget repository.

This is invisible to a developer in Visual Studio, so you need to open the .csproj file in a separate editor.

For my team, I think the cause is a combo of a lot of churn in both a dependent library and the solution that consumes that dependency. For whatever reason, a git merge will take both versions in the .csproj file without raising a conflict. In several project files, I found 3 versions of the same dependency.