如何在C#中将图片上传到Twitter API？

using System;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        // 1. 获取API密钥和访问令牌
        string apiKey = "YOUR_API_KEY";
        string apiSecret = "YOUR_API_SECRET";
        string accessToken = "YOUR_ACCESS_TOKEN";
        string accessTokenSecret = "YOUR_ACCESS_TOKEN_SECRET";

        // 2. 创建HttpClient实例
        HttpClient httpClient = new HttpClient();

        // 3. 设置请求头中的Authorization字段
        string authHeader = GenerateAuthHeader(apiKey, apiSecret, accessToken, accessTokenSecret);
        httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("OAuth", authHeader);

        // 4. 创建包含图片数据的HTTP请求体
        MultipartFormDataContent formData = new MultipartFormDataContent();
        byte[] imageBytes = File.ReadAllBytes("path/to/image.jpg");
        formData.Add(new ByteArrayContent(imageBytes), "media");

        // 5. 发送HTTP POST请求
        HttpResponseMessage response = await httpClient.PostAsync("https://upload.twitter.com/1.1/media/upload.json", formData);

        // 6. 解析响应
        if (response.IsSuccessStatusCode)
        {
            string responseContent = await response.Content.ReadAsStringAsync();
            Console.WriteLine("图片上传成功！");
            Console.WriteLine(responseContent);
        }
        else
        {
            Console.WriteLine("图片上传失败！");
            Console.WriteLine(response.StatusCode);
        }
    }

    static string GenerateAuthHeader(string apiKey, string apiSecret, string accessToken, string accessTokenSecret)
    {
        // 生成OAuth认证头部
        // 可以使用第三方库（如Tweetinvi）来生成OAuth认证头部，这里简化示例代码
        string oauthNonce = Guid.NewGuid().ToString("N");
        string oauthTimestamp = DateTimeOffset.Now.ToUnixTimeSeconds().ToString();
        string oauthSignatureMethod = "HMAC-SHA1";
        string oauthVersion = "1.0";

        string baseString = $"oauth_consumer_key={Uri.EscapeDataString(apiKey)}&" +
                            $"oauth_nonce={Uri.EscapeDataString(oauthNonce)}&" +
                            $"oauth_signature_method={Uri.EscapeDataString(oauthSignatureMethod)}&" +
                            $"oauth_timestamp={Uri.EscapeDataString(oauthTimestamp)}&" +
                            $"oauth_token={Uri.EscapeDataString(accessToken)}&" +
                            $"oauth_version={Uri.EscapeDataString(oauthVersion)}";

        string signature = GenerateSignature(baseString, apiSecret, accessTokenSecret);
        string authHeader = $"oauth_consumer_key=\"{Uri.EscapeDataString(apiKey)}\", " +
                            $"oauth_nonce=\"{Uri.EscapeDataString(oauthNonce)}\", " +
                            $"oauth_signature=\"{Uri.EscapeDataString(signature)}\", " +
                            $"oauth_signature_method=\"{Uri.EscapeDataString(oauthSignatureMethod)}\", " +
                            $"oauth_timestamp=\"{Uri.EscapeDataString(oauthTimestamp)}\", " +
                            $"oauth_token=\"{Uri.EscapeDataString(accessToken)}\", " +
                            $"oauth_version=\"{Uri.EscapeDataString(oauthVersion)}\"";

        return authHeader;
    }

    static string GenerateSignature(string baseString, string apiSecret, string accessTokenSecret)
    {
        // 生成签名
        // 可以使用第三方库（如Tweetinvi）来生成签名，这里简化示例代码
        string signingKey = $"{Uri.EscapeDataString(apiSecret)}&{Uri.EscapeDataString(accessTokenSecret)}";
        byte[] signingKeyBytes = System.Text.Encoding.UTF8.GetBytes(signingKey);
        byte[] baseStringBytes = System.Text.Encoding.UTF8.GetBytes(baseString);

        using (var hmacsha1 = new System.Security.Cryptography.HMACSHA1(signingKeyBytes))
        {
            byte[] signatureBytes = hmacsha1.ComputeHash(baseStringBytes);
            return Convert.ToBase64String(signatureBytes);
        }
    }
}