/// <summary>Begins an asynchronous request for a file system resource.</summary>
/// <returns>An <see cref="T:System.IAsyncResult" /> that references the asynchronous request.</returns>
/// <param name="callback">The <see cref="T:System.AsyncCallback" /> delegate. </param>
/// <param name="state">An object that contains state information for this request. </param>
/// <exception cref="T:System.InvalidOperationException">The stream is already in use by a previous call to <see cref="M:System.Net.FileWebRequest.BeginGetResponse(System.AsyncCallback,System.Object)" />. </exception>
/// <PermissionSet>
/// <IPermission class="System.Security.Permissions.FileIOPermission, mscorlib, Version=2.0.3600.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" version="1" Unrestricted="true" />
/// </PermissionSet>
public override IAsyncResult BeginGetResponse(AsyncCallback callback, object state)
{
lock (this)
{
if (this.asyncResponding)
{
throw new InvalidOperationException("Cannot re-call start of asynchronous method while a previous call is still in progress.");
}
this.asyncResponding = true;
}
FileWebRequest.GetResponseCallback getResponseCallback = new FileWebRequest.GetResponseCallback(this.GetResponseInternal);
return(getResponseCallback.BeginInvoke(callback, state));
}
/// <summary>Ends an asynchronous request for a file system resource.</summary>
/// <returns>A <see cref="T:System.Net.WebResponse" /> that contains the response from the file system resource.</returns>
/// <param name="asyncResult">An <see cref="T:System.IAsyncResult" /> that references the pending request for a response. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="asyncResult" /> is null. </exception>
public override WebResponse EndGetResponse(IAsyncResult asyncResult)
{
if (asyncResult == null)
{
throw new ArgumentNullException("asyncResult");
}
if (!asyncResult.IsCompleted)
{
asyncResult.AsyncWaitHandle.WaitOne();
}
AsyncResult asyncResult2 = (AsyncResult)asyncResult;
FileWebRequest.GetResponseCallback getResponseCallback = (FileWebRequest.GetResponseCallback)asyncResult2.AsyncDelegate;
WebResponse result = getResponseCallback.EndInvoke(asyncResult);
this.asyncResponding = false;
return(result);
}
