private IEnumerator<Int32> GetImages(AsyncEnumerator ae)
{
ae.ThrowOnMissingDiscardGroup(true);
// Request all the images asynchronously
WebRequest[] requests = new WebRequest[]
{
WebRequest.Create(_imageUris[0]),
WebRequest.Create(m_chkSimFailure.Checked ? _imageUris[2] : _imageUris[1])
};
for(Int32 n = 0; n < requests.Length; n++)
requests[n].BeginGetResponse(
ae.EndVoid(0, asyncResult => { requests[(Int32) asyncResult.AsyncState].EndGetResponse(asyncResult).Close(); }), n);
// Set timeout if specified.
Int32 timeout;
if(Int32.TryParse(m_txtServerTime.Text, out timeout))
ae.SetCancelTimeout(timeout, null);
// WaitAsync for all operations to complete (or timeout)
yield return requests.Length;
if(ae.IsCanceled())
{
m_lblPic1.Text = "Server couldn't process the request in the specified time.";
yield break;
}
for(Int32 n = 0; n < requests.Length; n++)
{
IAsyncResult result = ae.DequeueAsyncResult();
Int32 reqNum = (Int32) result.AsyncState;
Label lbl = (reqNum == 0) ? m_lblPic1 : m_lblPic2;
WebRequest request = requests[reqNum];
WebResponse response = null;
try
{
response = request.EndGetResponse(result);
lbl.Text = String.Format("Image at {0} is {1:N0} bytes",
response.ResponseUri, response.ContentLength);
}
catch(WebException e)
{
lbl.Text = String.Format("Error obtaining image at {0}: {1}",
request.RequestUri, e.Message);
}
finally
{
if(response != null) response.Close();
}
}
}
private IEnumerator<Int32> DownloadImages(AsyncEnumerator ae)
{
ae.ThrowOnMissingDiscardGroup(true);
GetImages.IsEnabled = false;
Cancel.IsEnabled = true;
WebRequest[] requests = new WebRequest[] {
WebRequest.Create(UriHelper.ConvertRelativeUriStringToAbsolute("Images/Wintellect.jpg")),
WebRequest.Create(UriHelper.ConvertRelativeUriStringToAbsolute("Images/JeffreyRichter.jpg")),
};
for (Int32 requestNum = 0; requestNum < requests.Length; requestNum++) {
requests[requestNum].BeginGetResponse(
ae.EndVoid(0, asyncResult => {
requests[requestNum].EndGetResponse(asyncResult).Close();
}), requestNum);
}
for (Int32 resultNum = 0; resultNum < requests.Length; resultNum++) {
yield return 1;
if (ae.IsCanceled()) break;
IAsyncResult asyncResult = ae.DequeueAsyncResult();
Int32 index = (Int32)asyncResult.AsyncState;
try {
using (WebResponse response = requests[index].EndGetResponse(asyncResult)) {
using (Stream stream = response.GetResponseStream()) {
BitmapImage bitmapImage = new BitmapImage();
bitmapImage.SetSource(stream);
m_images[index].Source = bitmapImage;
}
}
}
catch (WebException e) {
m_textboxes[index].Text = "Failed: " + e.Message;
}
}
GetImages.IsEnabled = true;
Cancel.IsEnabled = false;
}
private IEnumerator <Int32> GetImages(AsyncEnumerator ae)
{
ae.ThrowOnMissingDiscardGroup(true);
// Request all the images asynchronously
WebRequest[] requests = new WebRequest[]
{
WebRequest.Create(_imageUris[0]),
WebRequest.Create(m_chkSimFailure.Checked ? _imageUris[2] : _imageUris[1])
};
for (Int32 n = 0; n < requests.Length; n++)
{
requests[n].BeginGetResponse(
ae.EndVoid(0, asyncResult => { requests[(Int32)asyncResult.AsyncState].EndGetResponse(asyncResult).Close(); }), n);
}
// Set timeout if specified.
Int32 timeout;
if (Int32.TryParse(m_txtServerTime.Text, out timeout))
{
ae.SetCancelTimeout(timeout, null);
}
// WaitAsync for all operations to complete (or timeout)
yield return(requests.Length);
if (ae.IsCanceled())
{
m_lblPic1.Text = "Server couldn't process the request in the specified time.";
yield break;
}
for (Int32 n = 0; n < requests.Length; n++)
{
IAsyncResult result = ae.DequeueAsyncResult();
Int32 reqNum = (Int32)result.AsyncState;
Label lbl = (reqNum == 0) ? m_lblPic1 : m_lblPic2;
WebRequest request = requests[reqNum];
WebResponse response = null;
try
{
response = request.EndGetResponse(result);
lbl.Text = String.Format("Image at {0} is {1:N0} bytes",
response.ResponseUri, response.ContentLength);
}
catch (WebException e)
{
lbl.Text = String.Format("Error obtaining image at {0}: {1}",
request.RequestUri, e.Message);
}
finally
{
if (response != null)
{
response.Close();
}
}
}
}
