我尝试了所有方法，但仍然无法弄清楚为什么会出现这个错误。
背景： 我有一个用MonoTouch编写的iPad应用程序，并且我有一个在后台运行的线程，每15秒钟就要与服务器同步数据。这在线程的前几次迭代中都有效，但最终我会得到以下堆栈跟踪。
An exception occured: System.Net.WebException: Error getting response stream (ReadDone4): ServerProtocolViolation ---> System.FormatException: Input string was not in the correct format
at System.UInt32.Parse (System.String s) [0x00010] in /Developer/MonoTouch/Source/mono/mcs/class/corlib/System/UInt32.cs:405
at System.Net.WebConnection.GetResponse (System.Byte[] buffer, Int32 max) [0x000ba] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/WebConnection.cs:565
at System.Net.WebConnection.ReadDone (IAsyncResult result) [0x00095] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/WebConnection.cs:446
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x0005e] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/HttpWebRequest.cs:819
at System.Net.HttpWebRequest.GetResponse () [0x0000e] in /Developer/MonoTouch/Source/mono/mcs/class/System/System.Net/HttpWebRequest.cs:827
at SyncService.REST.RestClient.Execute[IEnumerable`1] (SyncService.REST.RestRequest request) [0x00079] in /Users/Chris/Compass/SyncService/REST/RestClient.cs:42
我正在与默认配置的IIS Web服务器通信。 这是我正在调用的方法：
public RestResponse<T> Execute<T>(RestRequest request){
var restResponse = new RestResponse<T>();
var serializer = new JavaScriptSerializer();
var urlPath = _baseUrl + "/" + request.Resource;
var httpRequest = (HttpWebRequest)HttpWebRequest.Create(new Uri(urlPath));
httpRequest.Headers = request.Headers;
Authenticator.Authenticate(httpRequest);
httpRequest.Method = request.Method.ToString();
if (request.Method == Method.POST)
SetPostData(httpRequest, request);
HttpWebResponse httpResponse = null;
try{
httpResponse = (HttpWebResponse) httpRequest.GetResponse();
var reader = new StreamReader(httpResponse.GetResponseStream());
var responseString = reader.ReadToEnd();
reader.Close();
restResponse.StatusCode = httpResponse.StatusCode;
restResponse.Headers = httpResponse.Headers;
restResponse.Data = serializer.Deserialize<T>(responseString);
restResponse.ResponseStatus = ResponseStatus.Completed;
}
catch(WebException e){
restResponse.ResponseStatus = ResponseStatus.Error;
restResponse.ErrorMessage = e.Message;
restResponse.ErrorException = e;
var webResponse = (HttpWebResponse) e.Response;
if (webResponse != null){
restResponse.StatusCode = webResponse.StatusCode;
restResponse.Headers = webResponse.Headers;
}
if (restResponse.StatusCode != HttpStatusCode.NotModified)
Console.WriteLine("An exception occured: " + e + "\r\n");
}catch (Exception ex) {
restResponse.ResponseStatus = ResponseStatus.Error;
restResponse.ErrorMessage = ex.Message;
restResponse.ErrorException = ex;
}
if (httpResponse != null)
httpResponse.Close();
return restResponse;
}
请帮我，我不知道该怎么办。Google上没有任何信息。
在出现错误之前，我可以成功发送22个请求。
编辑 我已将问题缩小为服务器问题。这是asp.net MVC，只有当我向客户端发送304时才会出现异常。请参见服务器代码：
private void ServeHttpStatusCode() {
Response.StatusCode = 304;
Response.Status = "304 Not Modified";
Response.StatusDescription = "The resource you are requesting has not been modified";
Response.ContentType = "application/json";
Response.Write("{\"Error\":\"The resource you are requesting has not been modified\"}");
Response.End();
Response.Close();
}