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Create and Publish Your Lambda Layer
- Prepare the Layer Directory: Create a directory structure that Lambda expects. For .NET libraries, Lambda layers expect the structure to be as follows:
layer/
└── bin/
└── netcoreapp3.1/ (or your target framework version)
└── ABC.dll
- Zip the Layer: Compress the layer/ directory into a .zip file.
- Publish the Layer: Use the AWS CLI to publish the layer:
aws lambda publish-layer-version --layer-name "MyDotNetLayer" --zip-file "fileb://layer.zip" --compatible-runtimes dotnetcore3.1
Replace dotnetcore3.1 with your target runtime if different.
Configure Your C#.NET Lambda Project Now, modify your C#.NET project to avoid including ABC.dll in its build output.
- Reference the DLL Conditionally: In your .csproj file, reference ABC.dll but set it to not copy to the output directory. Assuming you have the DLL locally for development, your reference might look like this:
<ItemGroup>
<Reference Include="ABC">
<HintPath>path\to\ABC.dll</HintPath>
<Private>false</Private> <!-- This prevents the DLL from being included in the output -->
</Reference>
</ItemGroup>
Setting <Private>false</Private> ensures the DLL is used during development but not packaged into the deployment.
- Build Your Project: Build your project as usual. Confirm that ABC.dll is not in the build output directory.
Deploy Your Lambda Function
After configuring the layer and the project:
- Assign the Layer to Your Lambda Function: When creating or updating your Lambda function, specify the layer that includes ABC.dll. This can be done in the AWS Management Console or using the AWS CLI. For example:
aws lambda update-function-configuration --function-name MyFunction --layers arn:aws:lambda:region:account-id:layer:MyDotNetLayer:version-number
- Deploy Your Function: Deploy your Lambda function package without ABC.dll. Lambda will use the version of ABC.dll provided in the layer.
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Thanks for the answer. If the lib/packages are added in PackageReference tag instaed of Reference tag then reference should like this <ItemGroup> <PackageReference Include="ABC" Version="x.x.x" ExcludeAssets="runtime" /> </ItemGroup>