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

        public class SliceUpload
    {
    private readonly HttpClient _httpClient;

public SliceUpload(HttpClient httpClient)
{
    _httpClient = httpClient;
}

public async Task UploadFileSlicesAsync(string filePath, string uploadUrl, int sliceSize)
{
    using (FileStream fileStream = File.OpenRead(filePath))
    {
        long fileLength = fileStream.Length;
        byte[] buffer = new byte[sliceSize];
        int read;
        int sliceStart = 0;

        while (sliceStart < fileLength)
        {
            read = await fileStream.ReadAsync(buffer, 0, sliceSize);
            using (MemoryStream sliceStream = new MemoryStream(buffer, 0, read))
            {
                using (ByteArrayContent content = new ByteArrayContent(sliceStream.ToArray()))
                {
                    // 這里可以添加必要的HTTP頭信息，比如切片索引、總切片數(shù)等
                    var response = await _httpClient.PostAsync(uploadUrl, content);
                    response.EnsureSuccessStatusCode();
                }
            }

            sliceStart += read;
        }
    }
}
  }

  // 使用方法
  var httpClient = new HttpClient();
    var sliceUpload = new SliceUpload(httpClient);
    await sliceUpload.UploadFileSlicesAsync("path/to/your/large/file",         
     "http://your.upload.server/upload", 1024 * 1024); // 切片大小為1MB