Sample for LocalStack article

Handler.cs

public async Task<APIGatewayProxyResponse> CreateProfileAsync(APIGatewayProxyRequest request, ILambdaContext context)
{
	WriteVariables(context);

	string requestBody = request.Body;

	context.Logger.LogLine($"Request Body\n {requestBody}");
	AddProfileModel addProfileModel = JsonConvert.DeserializeObject<AddProfileModel>(requestBody);

	context.Logger.LogLine($"Decoding Base64 image");
	var bytes = Convert.FromBase64String(addProfileModel.ProfilePicBase64);

	var fileTransferUtility = new TransferUtility(_awsS3Client);

	using (var ms = new MemoryStream(bytes))
	{
		context.Logger.LogLine($"Uploading {addProfileModel.ProfilePicName} to {BucketName}");
		await fileTransferUtility.UploadAsync(ms, BucketName, addProfileModel.ProfilePicName);
	}

	context.Logger.LogLine($"Adding profile to DynamoDb");
	await _awsDynamoDbClient.PutItemAsync(TableName, new Dictionary<string, AttributeValue>()
	{
		{nameof(AddProfileModel.Id), new AttributeValue(addProfileModel.Id)},
		{nameof(AddProfileModel.Name), new AttributeValue(addProfileModel.Name)},
		{nameof(AddProfileModel.Email), new AttributeValue(addProfileModel.Email)},
		{nameof(AddProfileModel.ProfilePicName), new AttributeValue(addProfileModel.ProfilePicName)}
	});

	var response = new APIGatewayProxyResponse
	{
		StatusCode = (int)HttpStatusCode.OK,
		Body = "Created",
		Headers = new Dictionary<string, string> { { "Content-Type", "text/plain" } }
	};

	return response;
}