在不保存到磁盘的情况下上传System.Drawing.Bitmap

using System;
using System.Drawing;
using System.IO;
using System.Net.Http;

public class ImageUploader
{
    public async Task UploadImageAsync(Bitmap bitmap, string url)
    {
        // 将 Bitmap 转换为字节数组
        byte[] imageBytes;
        using (MemoryStream ms = new MemoryStream())
        {
            bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
            imageBytes = ms.ToArray();
        }

        // 使用 HttpClient 上传字节数组
        using (HttpClient client = new HttpClient())
        {
            var content = new ByteArrayContent(imageBytes);
            content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("image/jpeg");
            var response = await client.PostAsync(url, content);

            if (response.IsSuccessStatusCode)
            {
                Console.WriteLine("Image uploaded successfully.");
            }
            else
            {
                Console.WriteLine($"Failed to upload image. Status code: {response.StatusCode}");
            }
        }
    }
}