AzureFunctions_ExtensionMethodSample.cs

#r "Newtonsoft.Json"

using System;
using System.Net;
using System.Threading.Tasks;
using Newtonsoft.Json;

public static async Task<object> Run(HttpRequestMessage req, TraceWriter log)
{
    log.Verbose($"Webhook was triggered!");

    string jsonContent = await req.Content.ReadAsStringAsync();
    dynamic data = JsonConvert.DeserializeObject(jsonContent);

    if (data.first == null || data.last == null) {
        return req.CreateResponse(HttpStatusCode.BadRequest, new {
            error = "Please pass first/last properties in the input object"
        });
    }

    var extensionMethodTest = Enumerable.Range(1,　11).Select(x => x * 10).ToArray().ToJoinedString(",");
    return req.CreateResponse(HttpStatusCode.OK, new {
        greeting = $"Hello {data.first} {data.last} and {extensionMethodTest}!"
    });
}

public static string ToJoinedString<T>(this IEnumerable<T> source, string separator = "")
{
    return string.Join(separator, source);
}