如何使用 OAuth 透過 Twitter API v1.1 進行身份驗證並檢索使用者的時間軸？

<code class="language-csharp">string oAuthConsumerKey = "superSecretKey";
string oAuthConsumerSecret = "superSecretSecret";
string oAuthUrl = "https://api.twitter.com/oauth2/token";
string screenName = "aScreenName";

// ...

// OAuth Authentication
string authHeaderFormat = "Basic {0}";
string authHeader = string.Format(authHeaderFormat,
    Convert.ToBase64String(Encoding.UTF8.GetBytes(Uri.EscapeDataString(oAuthConsumerKey) + ":" +
    Uri.EscapeDataString(oAuthConsumerSecret))));

string postBody = "grant_type=client_credentials";

HttpWebRequest authRequest = (HttpWebRequest)WebRequest.Create(oAuthUrl);
authRequest.Headers.Add("Authorization", authHeader);
authRequest.Method = "POST";
authRequest.ContentType = "application/x-www-form-urlencoded;charset=UTF-8";
authRequest.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

// ... (Send POST request and handle response as before) ...

// Retrieve User Timeline
string timelineFormat = "https://api.twitter.com/1.1/statuses/user_timeline.json?screen_name={0}&include_rts=1&exclude_replies=1&count=5";
string timelineUrl = string.Format(timelineFormat, screenName);
HttpWebRequest timelineRequest = (HttpWebRequest)WebRequest.Create(timelineUrl);
string timelineHeaderFormat = "{0} {1}";
timelineRequest.Headers.Add("Authorization", string.Format(timelineHeaderFormat, twitAuthResponse.token_type, twitAuthResponse.access_token));
timelineRequest.Method = "GET";

// ... (Send GET request and handle response as before) ...

// ... (TwitAuthenticateResponse class remains the same) ...</code>