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执行nuget pack时MSBuild命名空间错误的解决求助

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API 探路者
2026-8-12
.NET 4.7.2类库执行nuget pack时出现命名空间错误排查与解决

问题背景

用VS 2022创建了.NET 4.7.2类库，按照官方文档流程准备NuGet包。和.NET 6类库不同，该项目没有一键打包的项目属性选项。运行nuget pack命令时触发错误：“项目的默认XML命名空间必须是MSBuild XML命名空间”。检查项目CSPROJ文件后，确认<Project>元素已经包含正确的MSBuild 2003命名空间，错误提示毫无参考价值，且该问题场景与常见问答案例不同——它是在执行nuget pack时触发的。

相关文件内容

项目CSPROJ文件 

<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
    <ProjectGuid>{6A38AC27-E82D-47CF-B1C6-D987D7BCAE0C}</ProjectGuid>
    <OutputType>Library</OutputType>
    <AppDesignerFolder>Properties</AppDesignerFolder>
    <RootNamespace>CodaRESTClient.NET</RootNamespace>
    <AssemblyName>CodaRESTClient.NET</AssemblyName>
    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
    <FileAlignment>512</FileAlignment>
    <Deterministic>true</Deterministic>
    <NuGetPackageImportStamp>
    </NuGetPackageImportStamp>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
    <DebugSymbols>true</DebugSymbols>
    <DebugType>full</DebugType>
    <Optimize>false</Optimize>
    <OutputPath>bin\Debug\</OutputPath>
    <DefineConstants>DEBUG;TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
    <DebugType>pdbonly</DebugType>
    <Optimize>true</Optimize>
    <OutputPath>bin\Release\</OutputPath>
    <DefineConstants>TRACE</DefineConstants>
    <ErrorReport>prompt</ErrorReport>
    <WarningLevel>4</WarningLevel>
  </PropertyGroup>
  <PropertyGroup>
    <ApplicationIcon>Coda Logo - Image only.ico</ApplicationIcon>
  </PropertyGroup>
  <ItemGroup>
    <Reference Include="Microsoft.Bcl.AsyncInterfaces, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\Microsoft.Bcl.AsyncInterfaces.6.0.0\lib\net461\Microsoft.Bcl.AsyncInterfaces.dll</HintPath>
    </Reference>
    <Reference Include="Newtonsoft.Json, Version=13.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
      <HintPath>..\packages\Newtonsoft.Json.13.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
    </Reference>
    <Reference Include="RestSharp, Version=108.0.1.0, Culture=neutral, PublicKeyToken=598062e77f915f75, processorArchitecture=MSIL">
      <HintPath>..\packages\RestSharp.108.0.1\lib\netstandard2.0\RestSharp.dll</HintPath>
    </Reference>
    <Reference Include="System" />
    <Reference Include="System.Buffers, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Buffers.4.5.1\lib\net461\System.Buffers.dll</HintPath>
    </Reference>
    <Reference Include="System.Core" />
    <Reference Include="System.Memory, Version=4.0.1.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Memory.4.5.4\lib\net461\System.Memory.dll</HintPath>
    </Reference>
    <Reference Include="System.Numerics" />
    <Reference Include="System.Numerics.Vectors, Version=4.1.4.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Numerics.Vectors.4.5.0\lib\net46\System.Numerics.Vectors.dll</HintPath>
    </Reference>
    <Reference Include="System.Runtime.CompilerServices.Unsafe, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Runtime.CompilerServices.Unsafe.6.0.0\lib\net461\System.Runtime.CompilerServices.Unsafe.dll</HintPath>
    </Reference>
    <Reference Include="System.Text.Encodings.Web, Version=6.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Text.Encodings.Web.6.0.0\lib\net461\System.Text.Encodings.Web.dll</HintPath>
    </Reference>
    <Reference Include="System.Text.Json, Version=6.0.0.6, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Text.Json.6.0.6\lib\net461\System.Text.Json.dll</HintPath>
    </Reference>
    <Reference Include="System.Threading.Tasks.Extensions, Version=4.2.0.1, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\System.Threading.Tasks.Extensions.4.5.4\lib\net461\System.Threading.Tasks.Extensions.dll</HintPath>
    </Reference>
    <Reference Include="System.ValueTuple, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51, processorArchitecture=MSIL">
      <HintPath>..\packages\System.ValueTuple.4.5.0\lib\net47\System.ValueTuple.dll</HintPath>
    </Reference>
    <Reference Include="System.Web" />
    <Reference Include="System.Xml.Linq" />
    <Reference Include="System.Data.DataSetExtensions" />
    <Reference Include="Microsoft.CSharp" />
    <Reference Include="System.Data" />
    <Reference Include="System.Net.Http" />
    <Reference Include="System.Xml" />
  </ItemGroup>
  <ItemGroup>
    <Compile Include="Client.cs" />
    <Compile Include="Client_Comment.cs" />
    <Compile Include="Client_Discussion.cs" />
    <Compile Include="Client_Errors.cs" />
    <Compile Include="Client_Moderator.cs" />
    <Compile Include="Client_Subscriptions.cs" />
    <Compile Include="Client_Troubleshoot.cs" />
    <Compile Include="Client_Vote.cs" />
    <Compile Include="Properties\AssemblyInfo.cs" />
    <Compile Include="SerializableDictionary.cs" />
  </ItemGroup>
  <ItemGroup>
    <None Include="app.config" />
    <None Include="packages.config" />
  </ItemGroup>
  <ItemGroup>
    <Content Include="Coda Logo - Image only.ico" />
  </ItemGroup>
  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
  <Import Project="..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets" Condition="Exists('..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets')" />
  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
    <PropertyGroup>
      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
    </PropertyGroup>
    <Error Condition="!Exists('..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets'))" />
  </Target>
</Project>

NUSPEC配置文件 

<?xml version="1.0"?>
<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
  <metadata>
    <id>$id$</id>
    <version>$version$</version>
    <title>$title$</title>
    <authors>$author$</authors>
    <owners>$author$</owners>
    <licenseUrl>https://licenses.nuget.org/CATOSL-1.1</licenseUrl>
    <projectUrl>https://github.com/info-tpr/CodaEA</projectUrl>
    <iconUrl>https://www.codaea.io/images/CodaEA.png</iconUrl>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>$description$</description>
    <releaseNotes>Summary of changes made in this release of the package.</releaseNotes>
    <copyright>Copyright 2022, The Parallel Revolution LLC, All Rights Reserved</copyright>
    <tags>error code analysis</tags>
  </metadata>
</package>

完整错误输出 

nuget : The default XML namespace of the project must be the MSBuild XML namespace. If the project is authored in the MSBuild 2003 format, please add 
xmlns="http://schemas.microsoft.com/developer/msbuild/2003" to the <Project> element. If the project has been authored in the old 1.0 or 1.2 format, please convert it to MSBuild 2003 format.  
E:\Data\dotNetDev\codaea\CodaRESTServer\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets
At line:1 char:1
+ nuget pack
+ ~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (The default XML...xt.Json.targets:String) [], RemoteException
    + FullyQualifiedErrorId : NativeCommandError

错误原因分析

从错误信息的最后一行可以明确看出，问题并非出在项目自身的CSPROJ文件，而是依赖包System.Text.Json.6.0.6的System.Text.Json.targets文件。旧版本的NuGet CLI（v5.x及更早）无法兼容.NET Core/.NET 5+风格的targets文件命名空间，这类文件默认使用新的MSBuild命名空间，旧版NuGet CLI识别时会抛出错误。

解决方法

方法1：更新NuGet CLI至最新版本

下载并安装最新版NuGet CLI，重新执行nuget pack命令。新版本已修复该兼容性问题，能正确处理不同格式的targets文件。

方法2：修改依赖包的targets文件

若暂时无法更新NuGet CLI，可手动修改..\packages\System.Text.Json.6.0.6\build\System.Text.Json.targets文件：

  1. 打开该文件，找到顶部的<Project>标签。
  2. 添加MSBuild 2003命名空间属性：xmlns="http://schemas.microsoft.com/developer/msbuild/2003"。
    修改后的开头示例：
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">

保存文件后重新执行nuget pack即可。

方法3：使用MSBuild命令替代nuget pack

放弃直接使用nuget pack，改用MSBuild命令打包，兼容性更好：

msbuild /t:pack /p:Configuration=Release

内容的提问来源于stack exchange，提问作者Jay Imerman

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最近更新时间：2026.08.12 17:50:34