我有一个ASP。NET MVC5应用程序,昨天工作,现在我得到这个错误时,我试图构建:

该项目引用了这台计算机上缺少的NuGet包。

我已经检查了两个选项,允许nuget自动下载和安装丢失的包检查/打开。我还尝试删除packages文件夹中的所有文件,然后让nuget重新下载它们。另外,当我打开nuget并寻找更新时,它说没有需要安装的。我想不出还能做些什么来解决这个恼人的问题。

我还通过右键单击项目并选择该选项启用了nuget恢复。然后,它添加了一个nuget文件夹和该文件夹中的三个项目,但没有采取任何措施来解决问题。我已经尝试重新构建,但仍然得到相同的错误。


当前回答

我也有同样的问题。我在复制现有项目并将其转移到解决方案目录的文件夹中,并将其作为现有项目添加到空解决方案时遇到了这种情况。所以我必须编辑我的csproj文件并寻找这一行特定的代码,大多数情况下,这可以在最后几行找到:

  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />

在这一行之后,我必须注释掉这些:

  <Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
    <PropertyGroup>
      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.props'))" />
    <Error Condition="!Exists('..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets'))" />
  </Target>
  <Import Project="..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets" Condition="Exists('..\..\..\..\..\packages\EntityFramework.6.4.0\build\EntityFramework.targets')" />

您的解决方案将提示您的项目有更改,只需选择Reload All:

然后,在重新构建解决方案之后,一切都可以正常工作。

其他回答

我创建了一个名为'的文件夹。解决方案根文件夹中的Nuget 然后添加文件'NuGet。配置'在此文件夹中的以下内容

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<solution>
 <add key="disableSourceControlIntegration" value="true" />
</solution>
</configuration>

然后创建文件'. nuget。目标如下 $ (MSBuildProjectDirectory) . . \

    <!-- Enable the restore command to run before builds -->
    <RestorePackages Condition="  '$(RestorePackages)' == '' ">false</RestorePackages>

    <!-- Property that enables building a package from a project -->
    <BuildPackage Condition=" '$(BuildPackage)' == '' ">false</BuildPackage>

    <!-- Determines if package restore consent is required to restore packages -->
    <RequireRestoreConsent Condition=" '$(RequireRestoreConsent)' != 'false' ">true</RequireRestoreConsent>

    <!-- Download NuGet.exe if it does not already exist -->
    <DownloadNuGetExe Condition=" '$(DownloadNuGetExe)' == '' ">false</DownloadNuGetExe>
</PropertyGroup>

<ItemGroup Condition=" '$(PackageSources)' == '' ">
    <!-- Package sources used to restore packages. By default will used the registered sources under %APPDATA%\NuGet\NuGet.Config -->
    <!--
        <PackageSource Include="https://nuget.org/api/v2/" />
        <PackageSource Include="https://my-nuget-source/nuget/" />
    -->
</ItemGroup>

<PropertyGroup Condition=" '$(OS)' == 'Windows_NT'">
    <!-- Windows specific commands -->
    <NuGetToolsPath>$([System.IO.Path]::Combine($(SolutionDir), ".nuget"))</NuGetToolsPath>
    <PackagesConfig>$([System.IO.Path]::Combine($(ProjectDir), "packages.config"))</PackagesConfig>
    <PackagesDir>$([System.IO.Path]::Combine($(SolutionDir), "packages"))</PackagesDir>
</PropertyGroup>

<PropertyGroup Condition=" '$(OS)' != 'Windows_NT'">
    <!-- We need to launch nuget.exe with the mono command if we're not on windows -->
    <NuGetToolsPath>$(SolutionDir).nuget</NuGetToolsPath>
    <PackagesConfig>packages.config</PackagesConfig>
    <PackagesDir>$(SolutionDir)packages</PackagesDir>
</PropertyGroup>

<PropertyGroup>
    <!-- NuGet command -->
    <NuGetExePath Condition=" '$(NuGetExePath)' == '' ">$(NuGetToolsPath)\nuget.exe</NuGetExePath>
    <PackageSources Condition=" $(PackageSources) == '' ">@(PackageSource)</PackageSources>

    <NuGetCommand Condition=" '$(OS)' == 'Windows_NT'">"$(NuGetExePath)"</NuGetCommand>
    <NuGetCommand Condition=" '$(OS)' != 'Windows_NT' ">mono --runtime=v4.0.30319 $(NuGetExePath)</NuGetCommand>

    <PackageOutputDir Condition="$(PackageOutputDir) == ''">$(TargetDir.Trim('\\'))</PackageOutputDir>

    <RequireConsentSwitch Condition=" $(RequireRestoreConsent) == 'true' ">-RequireConsent</RequireConsentSwitch>
    <!-- Commands -->
    <RestoreCommand>$(NuGetCommand) install "$(PackagesConfig)" -source "$(PackageSources)"  $(RequireConsentSwitch) -o "$(PackagesDir)"</RestoreCommand>
    <BuildCommand>$(NuGetCommand) pack "$(ProjectPath)" -p Configuration=$(Configuration) -o "$(PackageOutputDir)" -symbols</BuildCommand>

    <!-- Make the build depend on restore packages -->
    <BuildDependsOn Condition="$(RestorePackages) == 'true'">
        RestorePackages;
        $(BuildDependsOn);
    </BuildDependsOn>

    <!-- Make the build depend on restore packages -->
    <BuildDependsOn Condition="$(BuildPackage) == 'true'">
        $(BuildDependsOn);
        BuildPackage;
    </BuildDependsOn>
</PropertyGroup>

<Target Name="CheckPrerequisites">
    <!-- Raise an error if we're unable to locate nuget.exe  -->
    <Error Condition="'$(DownloadNuGetExe)' != 'true' AND !Exists('$(NuGetExePath)')" Text="Unable to locate '$(NuGetExePath)'" />
    <SetEnvironmentVariable EnvKey="VisualStudioVersion" EnvValue="$(VisualStudioVersion)" Condition=" '$(VisualStudioVersion)' != '' AND '$(OS)' == 'Windows_NT' " />
    <DownloadNuGet OutputFilename="$(NuGetExePath)" Condition=" '$(DownloadNuGetExe)' == 'true' AND !Exists('$(NuGetExePath)')"  />
</Target>

<Target Name="RestorePackages" DependsOnTargets="CheckPrerequisites">
    <Exec Command="$(RestoreCommand)"
          Condition="'$(OS)' != 'Windows_NT' And Exists('$(PackagesConfig)')" />

    <Exec Command="$(RestoreCommand)"
          LogStandardErrorAsError="true"
          Condition="'$(OS)' == 'Windows_NT' And Exists('$(PackagesConfig)')" />
</Target>

<Target Name="BuildPackage" DependsOnTargets="CheckPrerequisites">
    <Exec Command="$(BuildCommand)" 
          Condition=" '$(OS)' != 'Windows_NT' " />

    <Exec Command="$(BuildCommand)"
          LogStandardErrorAsError="true"
          Condition=" '$(OS)' == 'Windows_NT' " />
</Target>

<UsingTask TaskName="DownloadNuGet" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
        <OutputFilename ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
        <Reference Include="System.Core" />
        <Using Namespace="System" />
        <Using Namespace="System.IO" />
        <Using Namespace="System.Net" />
        <Using Namespace="Microsoft.Build.Framework" />
        <Using Namespace="Microsoft.Build.Utilities" />
        <Code Type="Fragment" Language="cs">
            <![CDATA[
            try {
                OutputFilename = Path.GetFullPath(OutputFilename);

                Log.LogMessage("Downloading latest version of NuGet.exe...");
                WebClient webClient = new WebClient();
                webClient.DownloadFile("https://nuget.org/nuget.exe", OutputFilename);

                return true;
            }
            catch (Exception ex) {
                Log.LogErrorFromException(ex);
                return false;
            }
        ]]>
        </Code>
    </Task>
</UsingTask>

 <UsingTask TaskName="SetEnvironmentVariable" TaskFactory="CodeTaskFactory" AssemblyFile="$(MSBuildToolsPath)\Microsoft.Build.Tasks.v4.0.dll">
    <ParameterGroup>
        <EnvKey ParameterType="System.String" Required="true" />
        <EnvValue ParameterType="System.String" Required="true" />
    </ParameterGroup>
    <Task>
        <Using Namespace="System" />
        <Code Type="Fragment" Language="cs">
            <![CDATA[
            try {
                Environment.SetEnvironmentVariable(EnvKey, EnvValue, System.EnvironmentVariableTarget.Process);
            }
            catch  {
            }
        ]]>
        </Code>
    </Task>
</UsingTask>

是否有可能包已经恢复到错误的文件夹?检查csproj文件中的路径是否正确。

如果它们不同,则可能是由于包现在被恢复到不同的位置造成的。这可能是由NuGet引起的。在指定节点时检查配置文件,如下所示:

<add key="repositoryPath" value="..\..\Packages" />

这些包正在被修复,项目仍然在寻找旧的位置。

我有同样的问题,当我引用类库到我的MVC web应用程序,

问题是两个项目之间的nuget包版本号不匹配。

例如:我的类库有1.2.3的log4net,但我的webapp有1.2.6

修正:只要确保两个项目有相同的版本号引用。

在我的例子中,它与Microsoft.Build.Bcl版本有关。 我的nuget包版本是1.0.21,但我的项目文件仍然指向1.0.14版本

所以我把我的。csproj文件从:

  <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets" Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" />
   <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
    <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
    <Error Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.14\tools\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />
  </Target>

to:

 <Import Project="..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets" Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" />
  <Target Name="EnsureBclBuildImported" BeforeTargets="BeforeBuild" Condition="'$(BclBuildImported)' == ''">
    <Error Condition="!Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=317567." HelpKeyword="BCLBUILD2001" />
    <Error Condition="Exists('..\..\packages\Microsoft.Bcl.Build.1.0.21\build\Microsoft.Bcl.Build.targets')" Text="The build restored NuGet packages. Build the project again to include these packages in the build. For more information, see http://go.microsoft.com/fwlink/?LinkID=317568." HelpKeyword="BCLBUILD2002" />

这个结构又开始工作了。

在我的情况下,我必须从.csproj文件中删除以下内容:

<Import Project="$(SolutionDir)\.nuget\NuGet.targets" Condition="Exists('$(SolutionDir)\.nuget\NuGet.targets')" />
<Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
  <PropertyGroup>
    <ErrorText>This project references NuGet package(s) that are missing on this computer. Enable NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
  </PropertyGroup>
  <Error Condition="!Exists('$(SolutionDir)\.nuget\NuGet.targets')" Text="$([System.String]::Format('$(ErrorText)', '$(SolutionDir)\.nuget\NuGet.targets'))" />
</Target>

事实上,在这个代码片段中,您可以看到错误消息的来源。

我正在从msbuild集成包还原转换为自动包还原(https://learn.microsoft.com/en-us/nuget/consume-packages/package-restore#migrate-to-automatic-package-restore)