Twitter API v2を試す (C#)

using System.Net.Http;

var client = new HttpClient();

// HttpClient Header
client.DefaultRequestHeaders.Add("Authorization", $"BEARER {BEARER_TOKEN}");
client.DefaultRequestHeaders.Add("User-Agent", "C# App");

// Query String
var queryString = new Dictionary<string, string>()
{
    // { "query", "has:media KTWR" },
    { "query", QS_Search },
    { "tweet.fields", "author_id" },
    { "expansions", "attachments.media_keys" },
    { "media.fields", "preview_image_url" },
    { "user.fields", "name" },
    { "max_results", "50" }
};

var content = await new FormUrlEncodedContent(queryString).ReadAsStringAsync();

const string TW_BASEADDRESS = "https://api.twitter.com/2/tweets/search/recent";

var response = await client.GetAsync(TW_BASEADDRESS +"?"+ content);
OutTextBox.Text = await response.Content.ReadAsStringAsync();

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

using System.Net.Http;


namespace API_C
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        const string INIT_TEXT = "API Test by JS2IIU";
        const string BEARER_TOKEN = "ここにトークンを入れる";
        const string TW_BASEADDRESS = "https://api.twitter.com/2/tweets/search/recent";

        public MainWindow()
        {
            InitializeComponent();

            // TextBoxの文字列
            OutTextBox.Text = INIT_TEXT;
           
        }

        private async void TW_API_Button_Click(object sender, RoutedEventArgs e)
        {
            // Search word
            var SearchWord = KW_TextBox.Text;
            string QS_Search = "has:media " + SearchWord;
            // OutTextBox.Text = QS_Search;

            //static readonly HttpClient client = new HttpClient();
            var client = new HttpClient();

            // Base Address
            // client.BaseAddress = new Uri(TW_BASEADDRESS);

            // HttpClient Header
            client.DefaultRequestHeaders.Add("Authorization", $"BEARER {BEARER_TOKEN}");
            client.DefaultRequestHeaders.Add("User-Agent", "C# App");


            // Query String
            var queryString = new Dictionary<string, string>()
            {
               // Required. Query for matching Tweets. Up to 512 characters.
               // { "query", "has:media KTWR" },
               { "query", QS_Search },

               // attachments,author_id,context_annotations,created_at,entities,geo,
               // id,in_reply_to_user_id,lang,non_public_metrics,organic_metrics,
               // possibly_sensitive,promoted_metrics,public_metrics,referenced_tweets,source,text,withheld
               { "tweet.fields", "author_id" },

               // Comma-separated list of fields to expand. Expansions enable requests to expand an ID
               // into a full object in the includes response object.
               // Allowed values: attachments.poll_ids,attachments.media_keys,author_id,geo.place_id,in_reply_to_user_id,referenced_tweets.id
               // Default values: none
               { "expansions", "attachments.media_keys" },

               // duration_ms,height,media_key,non_public_metrics,organic_metrics,
               // preview_image_url,promoted_metrics,public_metrics,type,url,width
               { "media.fields", "preview_image_url" },

               // created_at,description,entities,id,location,name,pinned_tweet_id,profile_image_url,
               // protected,public_metrics,url,username,verified,withheld
               { "user.fields", "name" },

               // The maximum number of search results to be returned by a request.
               // A number between 10 and the system limit (currently 100).
               // By default, a request response will return 10 results.
               { "max_results", "50" }
            };

            

            // Call asynchronous network methods in a try/catch block to handle exceptions.
            try
            {
                
                var content = await new FormUrlEncodedContent(queryString).ReadAsStringAsync();
                // var strQS = TW_BASEADDRESS + "?" + content;
                var response = await client.GetAsync(TW_BASEADDRESS +"?"+ content);
                OutTextBox.Text = await response.Content.ReadAsStringAsync();
                
            }
            catch
            {
                // Take some action here
            }
            
        }

        private void EXIT_Button_Click(object sender, RoutedEventArgs e)
        {
            Application.Current.Shutdown();
        }
    }
}