Azure functions runtime exception, the type initializer for system data sqlclient excetion, Unable to load DLL 'sni.dll'

问题

I am using aspnet core 3.0 and azure function v3-preview with system.data.sqlclient version 4.7.0 When i try to run azure function(on both service queue trigger and time trigger) it gives below error :

The type initializer for 'System.Data.SqlClient.TdsParser' threw an exception. The type initializer for 'System.Data.SqlClient.SNILoadHandle' threw an exception. Unable to load DLL 'sni.dll' or one of its dependencies: The specified module could not be found.

I tried solutions from below links but didn't work: 1. Azure Function - System.Data.SqlClient is not supported on this platform 2. https://github.com/Azure/app-service-announcements-discussions/issues/9

I tried using "Microsoft.Data.SqlClient" for aspnetcore 3.0 But still the same exception occurs while running Azure function on Azure portal.

Please help !

Here is csproj file

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>netcoreapp3.0</TargetFramework>
    <AzureFunctionsVersion>v3-preview</AzureFunctionsVersion>
  </PropertyGroup>
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="1.0.30-beta2" />
    <PackageReference Include="runtime.native.System.Data.SqlClient.sni" Version="4.6.0" />
    <PackageReference Include="System.Data.SqlClient" Version="4.7.0" />
  </ItemGroup>
  <ItemGroup>
    <None Update="host.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
    </None>
    <None Update="local.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>Never</CopyToPublishDirectory>
    </None>
  </ItemGroup>
  <!-- For publish --><!--
  <ItemGroup>
    <None Include="$(USERPROFILE)\.nuget\packages\\microsoft.data.sqlclient\1.0.19249.1\runtimes\win\lib\netcoreapp2.1\microsoft.Data.SqlClient.dll">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>
  --><!-- For local debug --><!--
  <Target Name="CopyToBin" BeforeTargets="Build">
    <Copy SourceFiles="$(USERPROFILE)\.nuget\packages\microsoft.data.sqlclient\1.0.19249.1\runtimes\win\lib\netcoreapp2.1\microsoft.Data.SqlClient.dll" DestinationFolder="$(OutputPath)\bin" />
  </Target>-->

  <ItemGroup>
    <None Include="$(USERPROFILE)\.nuget\packages\\system.data.sqlclient\4.7.0\runtimes\win\lib\netcoreapp2.1\system.Data.SqlClient.dll">
      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
    </None>
  </ItemGroup>
  <Target Name="CopyToBin" BeforeTargets="Build">
    <Copy SourceFiles="$(USERPROFILE)\.nuget\packages\system.data.sqlclient\4.7.0\runtimes\win\lib\netcoreapp2.1\system.Data.SqlClient.dll" DestinationFolder="$(OutputPath)\bin" />
  </Target>

</Project>

回答1:

Please make sure your azure function meet these criteria in this link.

And here is a workaround provided by others, add the following to your .csproj:

<Target Name="PostBuild" AfterTargets="PostBuildEvent">
    <Exec Command="copy $(OutDir)$(ProjectName).deps.json $(OutDir)bin\function.deps.json" />
  </Target>
  <Target Name="PostPublish" BeforeTargets="Publish">
    <Exec Command="copy $(PublishDir)$(ProjectName).deps.json $(PublishDir)bin\function.deps.json" />
  </Target>

回答2:

It worked for me by adding below code in csproj file :

<Target Name="PostPublish" BeforeTargets="Publish">
  <Exec Command="move $(PublishDir)\runtimes $(PublishDir)\bin" />
</Target>

This line should be taking care of that: <Exec Command="move $(PublishDir)\runtimes $(PublishDir)\bin" />

reference : github

来源：https://stackoverflow.com/questions/58833050/azure-functions-runtime-exception-the-type-initializer-for-system-data-sqlclien