我可以使用流文件作爲源使用網絡文件將文件上傳到Web API嗎？

Question

在C＃中，而不是必須使用httpwebrequest從web下載文件，將其保存到文件的某處，然後使用POST將文件上傳到webservice作爲參數之一...

我可以改爲以某種方式從httpwebresponse打開一個閱讀器流，然後將其流入http POST？任何代碼有人可以張貼來顯示如何？

換句話說，我試圖避免首先保存到磁盤。

感謝

Answer 1

類似的東西應該做的伎倆：

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(); 
} 

（未測試的代碼）