private void HandleOutboundXmlRequest(IAsyncResult result)
{
// state...
ODataRequestState state = (ODataRequestState)result.AsyncState;
try
{
Stream stream = state.Request.EndGetRequestStream(result);
if (stream == null)
{
throw new InvalidOperationException("'stream' is null.");
}
using (stream)
{
// send it...
StreamWriter writer = new StreamWriter(stream);
writer.Write(state.OutboundXml);
writer.Flush();
}
// ok... next...
state.Request.BeginGetResponse(new AsyncCallback(HandleODataOperationResponse), state);
}
catch (Exception ex)
{
state.Failed(ex);
}
}
private void ExecuteODataOperation(ODataOperation opType, String url, String xml, Action callback, Failed failed)
{
// create the request...
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
// set the method...
if (opType == ODataOperation.Insert)
{
request.Method = "POST";
}
else if (opType == ODataOperation.Update)
{
request.Method = "MERGE";
}
else if (opType == ODataOperation.Delete)
{
request.Method = "DELETE";
}
else
{
throw new NotSupportedException(string.Format("Cannot handle '{0}'.", opType));
}
// headers... (including our special tokens)...
DownloadSettings settings = this.GetDownloadSettings();
foreach (string name in settings.ExtraHeaders.Keys)
{
request.Headers[name] = settings.ExtraHeaders[name];
}
// create a state object...
ODataRequestState state = new ODataRequestState();
state.Request = request;
state.Callback = callback;
state.Failed = failed;
state.OutboundXml = xml;
// do we have xml?
if (!(string.IsNullOrEmpty(xml)))
{
byte[] bs = Encoding.UTF8.GetBytes(xml);
request.ContentType = "application/atom+xml";
request.BeginGetRequestStream(new AsyncCallback(HandleOutboundXmlRequest), state);
}
else
{
request.BeginGetResponse(new AsyncCallback(HandleODataOperationResponse), state);
}
}
private void HandleODataOperationResponse(IAsyncResult result)
{
// state...
ODataRequestState state = (ODataRequestState)result.AsyncState;
try
{
// unwrap...
HttpWebResponse response = (HttpWebResponse)state.Request.EndGetResponse(result);
if (response == null)
{
throw new InvalidOperationException("'response' is null.");
}
// dispose the response...
response.Close();
// ok...
state.Callback();
}
catch (WebException ex)
{
StringBuilder builder = new StringBuilder();
builder.Append("An error occurred when making an OData request.");
if (ex.Response is HttpWebResponse)
{
using (Stream stream = ((HttpWebResponse)ex.Response).GetResponseStream())
{
StreamReader reader = new StreamReader(stream);
builder.Append(reader.ReadToEnd());
}
}
// throw...
throw new InvalidOperationException(builder.ToString(), ex);
}
catch (Exception ex)
{
state.Failed(ex);
}
}
