全新安裝的Visual Studio NuGet程序包管理器無法導入Microsoft.AspNetCore.All程序包

Question

我正在嘗試使用Visual Studio Enterprise Edition（新安裝）創建一個asp.net core 2.0 Web api項目，並且NuGet Package Manager在項目的構建階段失敗。

這是Visual Studio上的錯誤消息

點網還原的結果

關於這個問題有什么想法嗎？

.csproj文件

<Project Sdk="Microsoft.NET.Sdk.Web">
  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>
  <ItemGroup>
    <Folder Include="DataTransObj" />
    <Folder Include="Json" />
    <Folder Include="LogDepot" />
    <Folder Include="FileDepot\" />
    <Folder Include="wwwroot\" />
  </ItemGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.0.7" />
    <PackageReference Include="MongoDB.Driver.Core" Version="2.6.0" />
    <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
    <PackageReference Include="Newtonsoft.Json.Schema" Version="3.0.10" />
    <PackageReference Include="Serilog" Version="2.7.1-dev-00950" />
    <PackageReference Include="Serilog.AspNetCore" Version="2.1.1" />
    <PackageReference Include="Serilog.Settings.Configuration" Version="2.6.1" />
    <PackageReference Include="Serilog.Sinks.Console" Version="3.1.1" />
    <PackageReference Include="Serilog.Sinks.File" Version="4.0.1-dev-00790" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.0" />
  </ItemGroup>
</Project>

obj / ... nuget.g.targets文件：

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<Project ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <PropertyGroup>
    <MSBuildAllProjects>$(MSBuildAllProjects);$(MSBuildThisFileFullPath)</MSBuildAllProjects>
  </PropertyGroup>
  <ImportGroup Condition=" '$(ExcludeRestorePackageImports)' != 'true' ">
    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.0\build\netstandard2.0\NETStandard.Library.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\netstandard.library\2.0.0\build\netstandard2.0\NETStandard.Library.targets')" />
    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\build\netcoreapp2.0\Microsoft.NETCore.App.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.netcore.app\2.0.0\build\netcoreapp2.0\Microsoft.NETCore.App.targets')" />
    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.extensions.configuration.usersecrets\2.0.1\build\netstandard2.0\Microsoft.Extensions.Configuration.UserSecrets.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.extensions.configuration.usersecrets\2.0.1\build\netstandard2.0\Microsoft.Extensions.Configuration.UserSecrets.targets')" />
    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.aspnetcore.mvc.razor.viewcompilation\2.0.3\build\netstandard2.0\Microsoft.AspNetCore.Mvc.Razor.ViewCompilation.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.aspnetcore.mvc.razor.viewcompilation\2.0.3\build\netstandard2.0\Microsoft.AspNetCore.Mvc.Razor.ViewCompilation.targets')" />
    <Import Project="C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.aspnetcore.all\2.0.7\build\netcoreapp2.0\Microsoft.AspNetCore.All.targets" Condition="Exists('C:\Program Files\dotnet\sdk\NuGetFallbackFolder\microsoft.aspnetcore.all\2.0.7\build\netcoreapp2.0\Microsoft.AspNetCore.All.targets')" />
  </ImportGroup>
</Project>

Answer 1

全新安裝的Visual Studio NuGet程序包管理器無法導入Microsoft.AspNetCore.All程序包

默認的asp.net core 2.0 Web API項目模板包含一些nuget包，這些包將導入一些.targets文件。 根據錯誤信息：

“導入的項目文件... Microsoft.AspNetCore.All.targets，冷無法加載。根元素丟失”

似乎導入的.target文件在NuGetFallbackFolder文件夾中已損壞。 因為它是一個后備文件夾，所以要解決此問題，可以在該文件夾中刪除該程序包。 然后，當您創建一個新項目時，您會發現Visual Studio將從全局包文件夾C:\\Users\\<UserName>\\.nuget\\packages加載該包。 或者，您可以將此包從全局文件夾復制到NuGetFallbackFolder 。

希望這可以幫助。