Azure Functions启动时无法加载Microsoft.Extensions.Configuration.Abstractions程序集

你遇到的是依赖版本冲突问题：.NET 8 对应的 Microsoft.Extensions.Configuration.Abstractions 版本应为 8.x，但项目中存在依赖间接引用了 9.0.0.0 版本，导致运行时找不到对应程序集——即使手动安装该包，也可能因依赖优先级或绑定重定向问题未生效。

按以下步骤排查修复：

1. 锁定依赖版本 #

直接在 Function App 的 .csproj 中添加对 Microsoft.Extensions.Configuration.Abstractions 的显式引用，锁定到 .NET 8 兼容的版本（如 8.0.0）：

<ItemGroup>
  <!-- 保留原有包引用，新增以下行 -->
  <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="8.0.0" />
</ItemGroup>

2. 定位间接依赖来源 #

执行命令查看完整依赖链，找出哪个包/项目引入了 9.0 版本的组件：

dotnet list package --include-transitive

重点排查你引用的 HROne.Events.Services、HROne.Redis 等子项目，大概率是这些类库引用了更高版本的 Microsoft.Extensions.* 包，导致版本溢出到主项目。

3. 统一子项目依赖 #

确保所有引用的子项目（HROne 系列）的目标框架均为 net8.0，且它们的 Microsoft.Extensions.* 依赖版本统一为 8.x，避免跨版本引用。

4. 更新 Functions SDK #

你的 Microsoft.NET.Sdk.Functions 版本为 4.4.1，属于较旧版本，建议升级到兼容 .NET 8 的最新稳定版（如 4.28.1），新版本对依赖冲突的处理更完善：

<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.28.1" />

5. 清理缓存并重建 #

• 删除项目的 bin 和 obj 文件夹
• 清理 NuGet 缓存：

dotnet nuget locals all --clear

• 重新恢复依赖并构建：

dotnet restore
dotnet build

Startup 类 #

#region Dependency
using Microsoft.Azure.Functions.Extensions.DependencyInjection;
#endregion

[assembly: FunctionsStartup(typeof(HROne.Events.FunctionApp.Startup))]
namespace HROne.Events.FunctionApp;

public class Startup : FunctionsStartup
{
    public override void Configure(IFunctionsHostBuilder builder)
    {
        FunctionsHostBuilderContext context = builder.GetContext();
        builder.Services.RegisterApplicationServices(context.ApplicationRootPath);
    }
}

.csproj 文件 #

<Project Sdk="Microsoft.NET.Sdk">
<PropertyGroup>
<TargetFramework>net8.0</TargetFramework>
<AzureFunctionsVersion>v4</AzureFunctionsVersion>
</PropertyGroup>
<ItemGroup>
<None Remove="AzureAppConfigurationMapper.json" />
<None Remove="EmailTemplate\CommonNotificationMail.html" />
<None Remove="EmailTemplate\DeadLetterInfo.html" />
<None Remove="EmailTemplate\TimesheetReminderMail.html" />
</ItemGroup>
<ItemGroup>

<Content Include="EmailTemplate\CommonNotificationMail.html">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
<Content Include="EmailTemplate\DeadLetterInfo.html">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
</ItemGroup>
<ItemGroup>
<Content Include="AzureAppConfigurationMapper.json">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
<Content Include="EmailTemplate\TimesheetReminderMail.html">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</Content>
</ItemGroup>
<ItemGroup>
<PackageReference Include="Azure.Messaging.EventHubs" Version="5.11.5" />
<PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
<PackageReference Include="Microsoft.Azure.WebJobs.Extensions.DurableTask" Version="2.13.5" />
<PackageReference Include="Microsoft.Azure.WebJobs.Extensions.ServiceBus" Version="5.16.4" />
<PackageReference Include="Microsoft.Extensions.Configuration.AzureAppConfiguration" Version="7.3.0" />
<PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.4.1" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\..\HROne.BusinessLayer\HROne.Events.Services\HROne.Events.Services.csproj" />
<ProjectReference Include="..\..\HROne.BusinessLayer\HROne.Redis\HROne.Redis.csproj" />
<ProjectReference Include="..\..\HROne.BusinessLayer\HROne.Shared.Services\HROne.Shared.Services.csproj" />
<ProjectReference Include="..\..\HROne.DataModels\HROne.Events.Models\HROne.Events.Models.csproj" />
<ProjectReference Include="..\..\HROne.Repositories\HROne.Events.Repositories\HROne.Events.Repositories.csproj" />
<ProjectReference Include="..\..\HROne.Shared\HROne.Common\HROne.Common.csproj" />
</ItemGroup>
<ItemGroup>
<Using Include="HROne.Constants" />
</ItemGroup>
<ItemGroup>
<None Update="AppSettings.json">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="AppSettings.Test.json">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\ImportException.html">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\ImportPartial.html">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\MailTemplateImages\hrone_btn.png">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\MailTemplateImages\Welcome_header.jpg">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\NotificationMail.html">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\SingleSignOnWelcome.html">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\Welcome.html">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="EmailTemplate\WelcomeValidationMail.html">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>
<None Update="host.json">
<CopyToOutputDirectory>Always</CopyToOutputDirectory>
</None>
<None Update="local.settings.json">
<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
<CopyToPublishDirectory>Never</CopyToPublishDirectory>
</None>
</ItemGroup>
<Target Name="PostBuild" AfterTargets="PostBuildEvent">
<Exec Command="xcopy &quot;$(TargetDir)newrelic\*.*&quot; &quot;$(TargetDir)..\newrelic&quot; /Y /I /S" />
</Target>
</Project>

内容的提问来源于stack exchange，提问作者pratapsingh845