1. C# Code Samples：
using System;
using System.IO;
using System.Net.Http;
using System.Text;
using System.Web;
namespace FaceAPI
{
class Program
{
static void Main(string[] args)
{
//UsePictureURL();
UseLocalPicture();
Console.WriteLine("Hit ENTER to exit...");
Console.ReadLine();
}
/// <summary>
/// use picture URL
/// </summary>
static async void UsePictureURL()
{
var client = new HttpClient();
var queryString = HttpUtility.ParseQueryString(string.Empty);
// Request headers
client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key",
"4fe95dd8ec4247a69cb2a001efda06c6");//Face API key
// Request parameters
queryString["returnFaceId"] = "true";
queryString["returnFaceLandmarks"] = "false";
queryString["returnFaceAttributes"] = "age";
var uri = "https://api.cognitive.azure.cn/face/v1.0/detect?" +
queryString;
HttpResponseMessage response;
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