c# HTTP多部分MIME解析器

我从HTTP调用中获得多部分MIME响应，需要提取部分。我在寻找一种简单的方法。

我使用System.Net.Http方法来获取内容，但是提取响应部分让我感到困惑。

HttpClient zClient = new HttpClient();
Uri zAddress = new Uri("http://someDomain.com");
HttpContent content = new StringContent(sb.ToString());
HttpResponseMessage response = zClient.PostAsync(zAddress, content).Result;
if (response.IsSuccessStatusCode)
{
    // This returns true
    bool zIsMime = response.Content.IsMimeMultipartContent();
    // How do I get the message parts here. This ReadAsMultipartAsync method is confusing me. 
    ReadAsMultipartAsync(HttpContent) ???? 
}
else
{
    Console.WriteLine("{0} ({1})", (int)response.StatusCode, response.ReasonPhrase);
}

MultipartMemoryStreamProvider zMIME = await response.Content.ReadAsMultipartAsync();