/// <summary>
/// 确保httpContent的内容未被缓存
/// 已被缓存则抛出HttpContentBufferedException
/// </summary>
/// <param name="httpContent"></param>
/// <exception cref="HttpContentBufferedException"></exception>
public static void EnsureNotBuffered(this HttpContent httpContent)
{
if (httpContent.IsBuffered() == true)
{
throw new HttpContentBufferedException();
}
}