AzureFunctionTrigger.cs

public class AzureFunctionTrigger
{
    public HttpStatusCode StatusCode { get; private set; }
    public string ResponseMessage { get; private set;}
    
    public static async Task<AzureFunctionTrigger> PostAsync(string functionUrl)
    {
        var payload = new
        {
            first = "Azure",
            last = "Functions",
            name = "Azure"
        };
        var jsonString = JsonConvert.SerializeObject(payload);

        using (var client = new HttpClient())
        {
            var res = await client.PostAsync(functionUrl, new StringContent(jsonString, Encoding.UTF8, "application/json"));
            if (!res.IsSuccessStatusCode)
            {
                return new AzureFunctionTrigger
                {
                    StatusCode = res.StatusCode,
                    ResponseMessage = res.ReasonPhrase
                };
            }
            
            var json = await res.Content.ReadAsStringAsync();
            return new AzureFunctionTrigger
            {
                StatusCode = res.StatusCode,
                ResponseMessage = json
            };
        }
    }

    public static async Task<AzureFunctionTrigger> PostAsync(string functionUrl, string key)
    {
        var payload = new
        {
            first = "Azure",
            last = "Functions",
            name = "Azure"
        };
        var jsonString = JsonConvert.SerializeObject(payload);

        using (var client = new HttpClient())
        {
            client.DefaultRequestHeaders.Add("x-functions-key", key);
            var res = await client.PostAsync(functionUrl, new StringContent(jsonString, Encoding.UTF8, "application/json"));
            if (!res.IsSuccessStatusCode)
            {
                return new AzureFunctionTrigger
                {
                    StatusCode = res.StatusCode,
                    ResponseMessage = res.ReasonPhrase
                };
            }

            var json = await res.Content.ReadAsStringAsync();
            return new AzureFunctionTrigger
            {
                StatusCode = res.StatusCode,
                ResponseMessage = json
            };
        }
    }
}