void RSSDownloadComplete(object sender, DownloadDataCompletedEventArgs e)
{
// If the request was cancelled because the search was cancelled/abandoned, there is nothing else to do here
// The task completion was already notified to the search callback and the task status is already set.
if (e.Cancelled)
{
return;
}
// If the request threw an exception, remember the code and set the task status
if (e.Error != null)
{
this.ErrorCode = e.Error.HResult;
this.SetTaskStatus(VSConstants.VsSearchTaskStatus.Error);
}
else
{
try
{
// Parser code to parse through RSS results
var xmlDocument = new XmlDocument();
// The result is UTF-8 encoded, so make sure to decode it correctly
string resultXml = Encoding.UTF8.GetString(e.Result);
xmlDocument.LoadXml(resultXml);
var root = xmlDocument.DocumentElement;
// Each item/entry is a unique result
var entries = root.GetElementsByTagName("item");
if (entries.Count == 0)
entries = root.GetElementsByTagName("entry");
foreach (var node in entries)
{
// As we prepare the results, periodically check if the search was canceled
if (this.TaskStatus == VSConstants.VsSearchTaskStatus.Stopped)
{
// The completion was already notified by the base.OnStopSearch, there is nothing else to do
return;
}
var entry = node as XmlElement;
if (entry != null)
{
string title = null;
string url = null;
string description = null;
// Title tag provides result title
var titleNodes = entry.GetElementsByTagName("title");
if (titleNodes.Count > 0)
{
title = (titleNodes[0] as XmlElement).InnerText;
}
// Get the item's description as well
var descriptionNode = entry.GetElementsByTagName("description");
if (descriptionNode.Count > 0)
{
description = (descriptionNode[0] as XmlElement).InnerText;
}
// Link / URL / ID tag provides the URL linking the result string to its page
var linkNodes = entry.GetElementsByTagName("link");
if (linkNodes.Count == 0)
linkNodes = entry.GetElementsByTagName("url");
if (linkNodes.Count == 0)
linkNodes = entry.GetElementsByTagName("id");
if (linkNodes.Count > 0)
{
url = (linkNodes[0] as XmlElement).InnerText;
}
if (title != null && url != null)
{
// Create the results and then have the task report the result
var result = new MSDNSearchResult(title, url, description, this.provider);
this.SearchCallback.ReportResult(this, result);
// Increment the number of results reported by the provider
this.SearchResults++;
}
}
}
// Mark the task completed
this.SetTaskStatus(VSConstants.VsSearchTaskStatus.Completed);
}
catch (XmlException ex)
{
// Remember the error code and set correct task status but otherwise don't report xml parsing errors, in case MSDN RSS format changes
this.ErrorCode = ex.HResult;
this.SetTaskStatus(VSConstants.VsSearchTaskStatus.Error);
}
}
// Report completion of the search (with error or success)
this.SearchCallback.ReportComplete(this, this.SearchResults);
}
void RSSDownloadComplete(object sender, DownloadDataCompletedEventArgs e)
{
// If the request was cancelled because the search was cancelled/abandoned, there is nothing else to do here
// The task completion was already notified to the search callback and the task status is already set.
if (e.Cancelled)
{
return;
}
// If the request threw an exception, remember the code and set the task status
if (e.Error != null)
{
this.ErrorCode = e.Error.HResult;
this.SetTaskStatus(VSConstants.VsSearchTaskStatus.Error);
}
else
{
try
{
// Parser code to parse through RSS results
var xmlDocument = new XmlDocument();
// The result is UTF-8 encoded, so make sure to decode it correctly
string resultXml = Encoding.UTF8.GetString(e.Result);
xmlDocument.LoadXml(resultXml);
var root = xmlDocument.DocumentElement;
// Each item/entry is a unique result
var entries = root.GetElementsByTagName("item");
if (entries.Count == 0)
{
entries = root.GetElementsByTagName("entry");
}
foreach (var node in entries)
{
// As we prepare the results, periodically check if the search was canceled
if (this.TaskStatus == VSConstants.VsSearchTaskStatus.Stopped)
{
// The completion was already notified by the base.OnStopSearch, there is nothing else to do
return;
}
var entry = node as XmlElement;
if (entry != null)
{
string title = null;
string url = null;
string description = null;
// Title tag provides result title
var titleNodes = entry.GetElementsByTagName("title");
if (titleNodes.Count > 0)
{
title = (titleNodes[0] as XmlElement).InnerText;
}
// Get the item's description as well
var descriptionNode = entry.GetElementsByTagName("description");
if (descriptionNode.Count > 0)
{
description = (descriptionNode[0] as XmlElement).InnerText;
}
// Link / URL / ID tag provides the URL linking the result string to its page
var linkNodes = entry.GetElementsByTagName("link");
if (linkNodes.Count == 0)
{
linkNodes = entry.GetElementsByTagName("url");
}
if (linkNodes.Count == 0)
{
linkNodes = entry.GetElementsByTagName("id");
}
if (linkNodes.Count > 0)
{
url = (linkNodes[0] as XmlElement).InnerText;
}
if (title != null && url != null)
{
// Create the results and then have the task report the result
var result = new MSDNSearchResult(title, url, description, this.provider);
this.SearchCallback.ReportResult(this, result);
// Increment the number of results reported by the provider
this.SearchResults++;
}
}
}
// Mark the task completed
this.SetTaskStatus(VSConstants.VsSearchTaskStatus.Completed);
}
catch (XmlException ex)
{
// Remember the error code and set correct task status but otherwise don't report xml parsing errors, in case MSDN RSS format changes
this.ErrorCode = ex.HResult;
this.SetTaskStatus(VSConstants.VsSearchTaskStatus.Error);
}
}
// Report completion of the search (with error or success)
this.SearchCallback.ReportComplete(this, this.SearchResults);
}
// Verifies persistent data to populate MRU list with previously selected result
public IVsSearchItemResult CreateItemResult(string lpszPersistenceData)
{
return(MSDNSearchResult.FromPersistenceData(lpszPersistenceData, this));
}
