錯誤 NU1605 檢測到包降級

我在netcoreapp2.0控制台應用程序中遇到以下 NU1605 依賴項錯誤：

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)

我曾嘗試在 csproj 中引用這些包版本，但這並不能解決問題。參見 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>

他們似乎恢復得很好：

該項目還引用了Microsoft.NETCore.App 2.0 SDK。

從 CLI 執行 dotnet restore 時，我還收到以下錯誤，我不確定是否相關：

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]

我不知道它為什麼要從我們的私人公司包儲存庫中檢索有關“System.Runtime.Serialization.Formatters”的資訊。

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>

如果這意味著什麼，我還會收到以下 NU1603 警告：

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.

我對 .netcoreapp2.2 控制台應用程序有類似的問題。

該項目建設成功。但是，發布失敗並出現多個 NU1605 錯誤。

問題源於 log4net 版本 2.0.8。它在具有以下依賴項的 .netstandard2.0 項目中被引用：

他們在引用 log4net 的項目中導致包降級。在發布期間，這些警告被視為錯誤……

為了解決這個問題，我通過 Nuget 添加了這些庫的正確版本。

最後，發布成功。

PS當我第一次使用最新版本的庫添加包時，依賴列表上會顯示一個黃色警告標誌，就好像這些包不適合該項目一樣。解除安裝項目並重新載入後，警告標誌消失了！（我正在使用 Visual Studio 2019）

引用自：https://stackoverflow.com/questions/50286990