您可以使用HttpWebRequest获取文件并将其流回客户端。这使您可以获取带有URL的文件。我发现的一个示例（但不记得该在哪里归功）是
//Create a stream for the file Stream stream = null; //This controls how many bytes to read at a time and send to the client int bytesToRead = 10000; // Buffer to read bytes in chunk size specified above byte[] buffer = new Byte[bytesToRead]; // The number of bytes read try { //Create a WebRequest to get the file HttpWebRequest fileReq = (HttpWebRequest) HttpWebRequest.Create(url); //Create a response for this request HttpWebResponse fileResp = (HttpWebResponse) fileReq.GetResponse(); if (fileReq.ContentLength > 0) fileResp.ContentLength = fileReq.ContentLength; //Get the Stream returned from the response stream = fileResp.GetResponseStream(); // prepare the response to the client. resp is the client Response var resp = HttpContext.Current.Response; //Indicate the type of data being sent resp.ContentType = "application/octet-stream"; //Name the file resp.AddHeader("Content-Disposition", "attachment; filename="" + fileName + """); resp.AddHeader("Content-Length", fileResp.ContentLength.ToString()); int length; do { // Verify that the client is connected. if (resp.IsClientConnected) { // Read data into the buffer. length = stream.Read(buffer, 0, bytesToRead); // and write it out to the response's output stream resp.OutputStream.Write(buffer, 0, length); // Flush the data resp.Flush(); //Clear the buffer buffer = new Byte[bytesToRead]; } else { // cancel the download if client has disconnected length = -1; } } while (length > 0); //Repeat until no data is read } finally { if (stream != null) { //Close the input stream stream.Close(); } }
