Using Custom AWS Lambda Runtimes with asp.net core

Here's a good demo / tutorial that shows how the author approaches using the lambda bootstrap:

https://medium.com/@dimoss/asp-net-core-2-2-3-0-serverless-web-apis-in-aws-lambda-with-a-custom-runtime-and-lambda-warmer-ce19ce2e2c74

The author uses the following code to switch between local debugging and the lambda entry:

public class LocalEntryPoint
{
    private static readonly LambdaEntryPoint LambdaEntryPoint = new LambdaEntryPoint();
    private static readonly Func<APIGatewayProxyRequest, ILambdaContext, Task<APIGatewayProxyResponse>> Func = LambdaEntryPoint.FunctionHandlerAsync;

    public static async Task Main(string[] args)
    {
#if DEBUG
        BuildWebHost(args).Run();
#else
        // Wrap the FunctionHandler method in a form that LambdaBootstrap can work with.
        using (var handlerWrapper = HandlerWrapper.GetHandlerWrapper(Func, new JsonSerializer()))

        // Instantiate a LambdaBootstrap and run it.
        // It will wait for invocations from AWS Lambda and call the handler function for each one.
        using (var bootstrap = new LambdaBootstrap(handlerWrapper))
        {
            await bootstrap.RunAsync();
        }
#endif
    }

    public static IWebHost BuildWebHost(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup<Startup>()
            .Build();
}