/// <summary>
/// Provides an asynchronous version of the GetRequestStream method.
/// </summary>
/// <param name="callback">The AsyncCallback delegate</param>
/// <param name="state">An object containing state information for this asynchronous request</param>
/// <returns>An IAsyncResult that references the asynchronous request</returns>
public override IAsyncResult BeginGetRequestStream(AsyncCallback callback, object state)
{
GetRequestStreamDelegate getRequestStream = GetRequestStream;
// The return call. Store in the hashtable.
IAsyncResult asyncResult = getRequestStream.BeginInvoke(callback, state);
this.delegateTable[asyncResult] = getRequestStream;
// Begin the result.
return(asyncResult);
}
/// <summary>
/// Returns a Stream for writing data to the NNTP server.
/// </summary>
/// <param name="asyncResult">An IAsyncResult that references a pending request for a stream. </param>
/// <returns>A Stream to write data to.</returns>
public override Stream EndGetRequestStream(IAsyncResult asyncResult)
{
// Get the item from the hashtable. If it doesn't exist, then raise an
// exception.
GetRequestStreamDelegate getRequestStream =
(GetRequestStreamDelegate)this.delegateTable[asyncResult];
if (getRequestStream == null)
{
throw new NntpWebException("GetRequestStreamDelegate for "
+ this.requestUri +
"not found in delegates table of NntpWebRequest");
}
// Remove the item from the hashtable.
this.delegateTable.Remove(asyncResult);
// Finish off the call.
return(getRequestStream.EndInvoke(asyncResult));
}
