如何获取.net内核lambda的event.action？

using Amazon.Lambda.APIGatewayEvents;
using Amazon.Lambda.Core;

[assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))]

namespace MyLambdaFunction
{
    public class MyLambdaFunction
    {
        public APIGatewayProxyResponse FunctionHandler(APIGatewayProxyRequest request, ILambdaContext context)
        {
            string httpMethod = request.HttpMethod;
            // 获取event.action
            string eventAction = httpMethod;

            // 其他处理逻辑...

            return new APIGatewayProxyResponse
            {
                StatusCode = 200,
                Body = "Success",
                Headers = new Dictionary<string, string> { { "Content-Type", "text/plain" } }
            };
        }
    }
}