在WebAPI中使用PushStreamContent时，如何满足多字节范围？

public HttpResponseMessage Get()
{
    // 创建HttpResponseMessage对象
    HttpResponseMessage response = new HttpResponseMessage();

    // 设置Content属性为PushStreamContent对象
    response.Content = new PushStreamContent((stream, content, context) =>
    {
        // 获取客户端请求头中的"Range"字段的值
        string rangeHeader = context.Request.Headers.Range.ToString();

        // 解析"Range"字段的值，获取字节范围
        long startByte = 0;
        long endByte = fileSize - 1; // 假设文件大小为fileSize

        if (!string.IsNullOrEmpty(rangeHeader))
        {
            string[] range = rangeHeader.Split(new char[] { '=', '-' });
            startByte = Convert.ToInt64(range[1]);
            if (range.Length > 2 && !string.IsNullOrEmpty(range[2]))
            {
                endByte = Convert.ToInt64(range[2]);
            }
        }

        // 读取相应的数据，并写入响应流中
        byte[] buffer = new byte[1024];
        using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
        {
            fileStream.Seek(startByte, SeekOrigin.Begin);
            long remainingBytes = endByte - startByte + 1;
            while (remainingBytes > 0)
            {
                int bytesRead = fileStream.Read(buffer, 0, buffer.Length);
                if (bytesRead <= 0)
                {
                    break;
                }
                stream.Write(buffer, 0, bytesRead);
                remainingBytes -= bytesRead;
            }
        }
        stream.Close();
    });

    // 设置Content-Range响应头，指定返回的字节范围
    response.Content.Headers.ContentRange = new ContentRangeHeaderValue(startByte, endByte, fileSize);

    return response;
}