AWS Lambda
Developer Guide

AWS Lambda Context Object in C#

When Lambda runs your function, it passes a context object to the handler. This object provides properties with information about the invocation, function, and execution environment.

Context Properties

  • FunctionName – The name of the Lambda function.

  • FunctionVersion – The version of the function.

  • InvokedFunctionArn – The Amazon Resource Name (ARN) used to invoke the function. Indicates if the invoker specified a version number or alias.

  • MemoryLimitInMB – The amount of memory configured on the function.

  • AwsRequestId – The identifier of the invocation request.

  • LogGroupName – The log group for the function.

  • LogStreamName – The log stream for the function instance.

  • RemainingTime (TimeSpan) – The number of milliseconds left before the execution times out.

  • Identity – (mobile apps) Information about the Amazon Cognito identity that authorized the request.

  • ClientContext – (mobile apps) Client context provided to the Lambda invoker by the client application.

  • Logger The logger object for the function.

The following C# code snippet shows a simple handler function that prints some of the context information.

public async Task Handler(ILambdaContext context) { Console.WriteLine("Function name: " + context.FunctionName); Console.WriteLine("RemainingTime: " + context.RemainingTime); await Task.Delay(TimeSpan.FromSeconds(0.42)); Console.WriteLine("RemainingTime after sleep: " + context.RemainingTime); }