Azure Logic App本地函数添加依赖后程序集版本冲突求解

基于.NET Framework 4.7.2创建的Azure Logic App Standard本地函数，原本运行正常，添加Azure.Identity、Azure.Messaging.ServiceBus等外部依赖后，出现程序集加载失败的版本冲突问题。

项目csproj配置： #

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <IsPackable>false</IsPackable>
    <TargetFramework>net472</TargetFramework>
    <AzureFunctionsVersion>v4</AzureFunctionsVersion>
    <OutputType>Library</OutputType>
    <PlatformTarget>x64</PlatformTarget>
    <!-- Please replace 'LogicAppFolder' with the name of your folder that contains your logic app project. -->
    <LogicAppFolder>LogicApp</LogicAppFolder>
    <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    <LangVersion>latest</LangVersion>
 </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Azure.Identity" Version="1.12.0" />
    <PackageReference Include="Azure.Messaging.ServiceBus" Version="7.17.5" />
    <PackageReference Include="Microsoft.Azure.WebJobs.Core" Version="3.0.41" />
    <PackageReference Include="Microsoft.Azure.Workflows.WebJobs.Sdk" Version="1.1.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="2.1.1" />
    <PackageReference Include="Microsoft.Extensions.Logging" Version="2.1.1" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="4.4.1" />
  </ItemGroup>

<Target Name="Task" AfterTargets="Compile">
    <ItemGroup>
        <DirsToClean2 Include="..\$(LogicAppFolder)\lib\custom" />
      </ItemGroup>
      <RemoveDir Directories="@(DirsToClean2)" />
 </Target>
 
  <Target Name="CopyExtensionFiles" AfterTargets="ParameterizedFunctionJsonGenerator">
    <ItemGroup>
        <CopyFiles Include="$(MSBuildProjectDirectory)\bin\$(Configuration)\net472\**\*.*" CopyToOutputDirectory="PreserveNewest" Exclude="$(MSBuildProjectDirectory)\bin\$(Configuration)\net472\*.*" />
      <CopyFiles2 Include="$(MSBuildProjectDirectory)\bin\$(Configuration)\net472\*.*" />
    </ItemGroup>
    <Copy SourceFiles="@(CopyFiles)" DestinationFolder="..\$(LogicAppFolder)\lib\custom\%(RecursiveDir)" SkipUnchangedFiles="true" />
    <Copy SourceFiles="@(CopyFiles2)" DestinationFolder="..\$(LogicAppFolder)\lib\custom\net472\" SkipUnchangedFiles="true" />
    <ItemGroup>
        <MoveFiles Include="..\$(LogicAppFolder)\lib\custom\bin\*.*" />
    </ItemGroup>

   <Move SourceFiles="@(MoveFiles)" DestinationFolder="..\$(LogicAppFolder)\lib\custom\net472" />
    <ItemGroup>
       <DirsToClean Include="..\$(LogicAppFolder)\lib\custom\bin" />
     </ItemGroup>
       <RemoveDir Directories="@(DirsToClean)" />
  </Target>
 
  <ItemGroup>
      <Reference Include="Microsoft.CSharp" />
  </ItemGroup>
  <ItemGroup>
    <Folder Include="bin\$(Configuration)\net472\" />
  </ItemGroup>
</Project>

运行时异常： #

Result: Function 'ReadQueueSessionMessage', Invocation id '6eda05ec-d18d-41bf-832b-c02144b18cf7': An exception was thrown by the invocation.
Exception: System.IO.FileNotFoundException: Could not load file or assembly 'Azure.Core, Version=1.38.0.0, Culture=neutral, PublicKeyToken=92742159e12e44c8' or one of its dependencies. The system cannot find the file specified.

解决方案 #

1. 启用绑定重定向（支持Logic App本地函数）

基于.NET Framework的Logic App本地函数支持绑定重定向，操作步骤：

• 在函数项目中添加app.config文件，配置Azure.Core等程序集的绑定重定向规则，示例：

  <configuration>
    <runtime>
      <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
          <assemblyIdentity name="Azure.Core" publicKeyToken="92742159e12e44c8" culture="neutral" />
          <bindingRedirect oldVersion="0.0.0.0-1.38.0.0" newVersion="1.38.0.0" />
        </dependentAssembly>
      </assemblyBinding>
    </runtime>
  </configuration>
  

• 修改csproj，确保app.config被复制到输出目录：

  <ItemGroup>
    <None Include="app.config">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
  </ItemGroup>
  

• 更新CopyExtensionFiles目标，将app.config复制到Logic App的lib/custom/net472目录下。

2. 对齐依赖包版本

• 检查Azure.Identity 1.12.0与Azure.Messaging.ServiceBus 7.17.5依赖的Azure.Core版本，手动添加Azure.Core的PackageReference，指定两者兼容的版本：

  <PackageReference Include="Azure.Core" Version="1.38.0" />
  

• 升级或降级相关Azure SDK包到互相兼容的版本，避免版本不一致导致的依赖缺失。

3. 修复程序集复制逻辑

当前的CopyExtensionFiles目标可能遗漏部分依赖程序集：

• 修改CopyFiles的包含规则，确保所有子目录下的依赖dll都被复制；或使用MSBuild的ResolveAssemblyReferences任务获取所有依赖项后再复制，保证Azure.Core等dll被正确复制到lib/custom/net472目录。

4. 解决Azure.Identity已知问题

针对Azure.Identity的相关bug，直接升级到最新稳定版本，或降级到无该问题的版本，同时确保新版本与其他依赖兼容。

内容的提问来源于stack exchange，提问作者Rob Bowman