I built a lambda function in C#. After running dotnet publish, zipping everything up, and uploading it in the dashboard, it isn't running because it seems to think that the function is located at LambdaTest::LambdaTest.LambdaHandler::handleRequest rather than inside the assembly I built.

I can see the value if I open the function's Template. But I can't edit it. It says "This AWS SAM template has been generated from your function's configuration" but I can't find that value anywhere in any piece of configuration I can see. It has an option to export the template to something called Infrastructure Composer, where I can go in and edit the template, but there doesn't appear to be any option in Infrastructure Composer to save my changes back to the original lambda function.

This should be incredibly straightforward, but I just don't see where the option is. How do I change this value?

I built a lambda function in C#. After running dotnet publish, zipping everything up, and uploading it in the dashboard, it isn't running because it seems to think that the function is located at LambdaTest::LambdaTest.LambdaHandler::handleRequest rather than inside the assembly I built.

I can see the value if I open the function's Template. But I can't edit it. It says "This AWS SAM template has been generated from your function's configuration" but I can't find that value anywhere in any piece of configuration I can see. It has an option to export the template to something called Infrastructure Composer, where I can go in and edit the template, but there doesn't appear to be any option in Infrastructure Composer to save my changes back to the original lambda function.

This should be incredibly straightforward, but I just don't see where the option is. How do I change this value?

• amazon-web-services
• aws-lambda

Share Improve this question Follow edited Mar 26 at 12:11 jarmod 79k1818 gold badges130130 silver badges135135 bronze badges Recognized by AWS Collective asked Mar 26 at 4:29 Mason WheelerMason Wheeler 84.7k5454 gold badges285285 silver badges505505 bronze badges 1

• Perhaps related: stackoverflow/questions/74144256 – jarmod Commented Mar 26 at 12:14

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2 Answers 2

Sorted by: Reset to default 0

After a lot of searching around, I was never able to find a way to edit this successfully in the UI, but there is a way to do it in the AWS CLI:

aws lambda update-function-configuration --function-name [name] --handler "correct handler here"

Leaving this here just in case anyone needs this in the future.

You should have a "aws-lambda-tools-defaults.json" file under "src" folder zipped with your binary where you can specify configuration. This is an example configuration find in the documentation here.

 "profile" : "default",
  "region" : "us-east-2",
  "configuration" : "Release",
  "function-architecture": "x86_64",
  "function-runtime":"dotnet8",
  "function-memory-size" : 256,
  "function-timeout" : 30,
  "function-handler" : "myDotnetFunction::myDotnetFunction.Function::FunctionHandler"

I believe changing the function-handler property value to the correct one, and reuploading would suffice.