.NET7迁移至.NET8后MAUI Android打包报错的解决咨询

问题详情 #

将MAUI项目从.NET7迁移到.NET8后，打包部署到Google Play时出现两个构建错误：

error MSB4064: The "AndroidFixManifests" parameter is not supported by the "XamarinDownloadArchives" task loaded from assembly: Xamarin.Build.Download, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null from the path: C:\Users\enric.nuget\packages\xamarin.build.download\0.11.4\buildTransitive\Xamarin.Build.Download.dll. Verify that the parameter exists on the task, the points to the correct assembly, and it is a settable public instance property.

error MSB4063: The "XamarinDownloadArchives" task could not be initialized with its input parameters.

查看项目依赖的Xamarin.Build.Download.targets文件，发现其中的_XamarinBuildDownloadCore目标传递了AndroidFixManifests参数：

<Target Name="_XamarinBuildDownloadCore"
        Condition="'@(XamarinBuildDownload)'!=''">

    <XamarinDownloadArchives
        AllowUnsecureUrls="$(XamarinBuildDownloadAllowUnsecure)"
        Archives="@(XamarinBuildDownload)"
        DestinationBase="$(XamarinBuildDownloadDir)"
        CacheDirectory="$(XamarinBuildDownloadDir)"
        User7ZipPath="$(XamarinBuildDownloadUser7ZipPath)"
        VsInstallRoot="$(VsInstallRoot)"
        IsAndroid="$(_XamarinBuildDownloadIsAndroid)"
        AndroidFixManifests="$(_XamarinBuildDownloadAndroidFixManifests)"
        />
</Target>

解决方法 #

• 更新Xamarin.Build.Download包：当前使用的0.11.4版本不支持AndroidFixManifests参数，而.NET8的MAUI构建逻辑会自动传入该参数。将包更新到0.12.0及以上版本，新版本已适配该参数。
• 临时移除参数传递（不推荐）：若暂时无法更新包，可手动修改Xamarin.Build.Download.targets文件，删除AndroidFixManifests="$(_XamarinBuildDownloadAndroidFixManifests)"这一行；或者在项目的.csproj中添加配置，禁用该参数：

  <PropertyGroup>
    <_XamarinBuildDownloadAndroidFixManifests>False</_XamarinBuildDownloadAndroidFixManifests>
  </PropertyGroup>
  

  注意：此方法为临时方案，后续包更新会覆盖修改，优先选择更新包。
• 清理NuGet缓存并重新还原：更新包后，执行以下命令清理缓存并重新还原依赖，避免旧版本文件残留：

  dotnet nuget locals all --clear
  dotnet restore
  

内容的提问来源于stack exchange，提问作者Enrico