我可以使用流文件作为源使用网络文件将文件上传到Web API吗？

Question

在C＃中，而不是必须使用httpwebrequest从web下载文件，将其保存到文件的某处，然后使用POST将文件上传到webservice作为参数之一...

我可以改为以某种方式从httpwebresponse打开一个阅读器流，然后将其流入http POST？任何代码有人可以张贴来显示如何？

换句话说，我试图避免首先保存到磁盘。

感谢

Answer 1

类似的东西应该做的伎俩：

HttpWebRequest downloadRequest = WebRequest.Create(downloadUri) as HttpWebRequest; 
using(HttpWebResponse downloadResponse = downloadRequest.GetResponse() as HttpWebResponse) 
{ 
    HttpWebRequest uploadRequest = new HttpWebRequest(uploadUri); 
    uploadRequest.Method = "POST"; 
    uploadRequest.ContentLength = downloadResponse.ContentLength; 
    using (Stream downloadStream = downloadResponse.GetResponseStream()) 
    using (Stream uploadStream = uploadRequest.GetRequestStream()) 
    { 
     byte[] buffer = new byte[4096]; 
     int totalBytes = 0; 
     while(totalBytes < downloadResponse.ContentLength) 
     { 
      int nBytes = downloadStream.Read(buffer, 0, buffer.Length); 
      uploadStream.Write(buffer, 0, nBytes); 
      totalBytes += nRead; 
     } 
    } 
    HttpWebResponse uploadResponse = uploadRequest.GetResponse() as HttpWebResponse; 
    uploadResponse.Close(); 
} 

（未测试的代码）