流不可寫

我正在嘗試從SOAP SOAP Api讀取響應，並在foreach循環的第二次運行中得到Stream was not writable錯誤。在list ArrayList中的第一個值按預期工作，但第二個值在Stream was not writable行上表示Stream was not writable。我究竟做錯了什麼？流不可寫

 WebRequest webRequest = WebRequest.Create("https://www.api.com/v2.0/xml/"); 
     HttpWebRequest httpRequest = (HttpWebRequest)webRequest; 
     httpRequest.Method = "POST"; 
     httpRequest.ContentType = "text/xml; charset=utf-8"; 
     httpRequest.ProtocolVersion = HttpVersion.Version11; 
     httpRequest.Credentials = CredentialCache.DefaultCredentials; 
     Stream requestStream = httpRequest.GetRequestStream(); 

     StreamWriter streamWriter = new StreamWriter(requestStream, Encoding.ASCII); 

     StringBuilder soapRequest; 

     foreach (var bol in list) { 
     oRequest = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"; 
     oRequest = oRequest + "<file>"; 
     oRequest = oRequest + "<IntDocNumber>" + bol + "</IntDocNumber>"; 
     oRequest = oRequest + "</file>"; 

     soapRequest = new StringBuilder(oRequest); 
     streamWriter = new StreamWriter(requestStream, Encoding.ASCII); 
     streamWriter.Write(soapRequest.ToString()); 
     streamWriter.Close(); 

     //Get the Response  
     HttpWebResponse wr = (HttpWebResponse)httpRequest.GetResponse(); 
     StreamReader srd = new StreamReader(wr.GetResponseStream()); 
     string resulXmlFromWebService = srd.ReadToEnd(); 

     XmlDocument xml = new XmlDocument(); 
     xml.LoadXml(resulXmlFromWebService); 

     XmlNodeList xnList = xml.SelectNodes("/root/data/item"); 
     }

來源

2015-09-01 Dmitrij Kultasev

我會嘗試在foreach循環中聲明StreamWriter，如果可以的話您的解決方案 –

我這樣做了。結果是一樣的 –

您不能在多個請求中重複使用相同的請求對象。你只需要創建一個新的:) – Luaan

所有HTTP通信發生在三個步驟：

客戶機打開一個連接
客戶端將其頭部和數據（在你的情況下，XML文件），並且結束輸入（在其中在關閉請求流情況）
服務器發送其響應並關閉連接

所以，當你關閉連接時，你不能發送任何東西，因爲你必須等待服務器的回答。如果您想發送更多數據，請將代碼的開頭（在您創建新WebRequest的位置）移至For循環中。

來源

2015-09-01 07:56:16 naivists

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