void asyncOperation_Failed(object sender, ThreadExceptionEventArgs e)
{
UpdateSemanticHtmlPreviewAsyncOperation asyncOperation = (UpdateSemanticHtmlPreviewAsyncOperation)sender;
Trace.WriteLine("UpdateSemanticHtmlPreviewAsyncOperation failed for blog(" + asyncOperation.BlogId + "): " + e.Exception);
// Note: We intentionally do not remove this async op from asyncOps in order to prevent an infinite loop of failures.
}
void asyncOperation_Completed(object sender, EventArgs e)
{
UpdateSemanticHtmlPreviewAsyncOperation asyncOperation = (UpdateSemanticHtmlPreviewAsyncOperation)sender;
lock (Lock)
{
_asyncOps.Remove(asyncOperation.BlogId);
}
}
internal Bitmap GetPreviewBitmap(string blogId, string elementId)
{
Debug.Assert(_blogPreviewInfo.ContainsKey(blogId), "Need to register blog for preview");
Debug.Assert(((ISynchronizeInvoke)_editingSite).InvokeRequired == false, "This should only be called on the UI thread");
string path = GetPreviewBitmapPath(blogId, elementId);
try
{
lock (Lock)
{
BlogPreviewInfo info = _blogPreviewInfo[blogId];
if (info.BitmapCached(elementId))
{
return(info.GetBitmap(elementId));
}
else if (File.Exists(path))
{
MemoryStream ms;
using (FileStream fs = File.OpenRead(path))
{
ms = new MemoryStream((int)fs.Length);
StreamHelper.Transfer(fs, ms);
ms.Seek(0, SeekOrigin.Begin);
}
info.SetBitmap(elementId, new Bitmap(ms));
return(info.GetBitmap(elementId));
}
if (!_asyncOps.ContainsKey(blogId))
{
// Fetch asynchronously
UpdateSemanticHtmlPreviewAsyncOperation asyncOperation = new UpdateSemanticHtmlPreviewAsyncOperation(_editingSite, blogId, info.ElementIds, info.TemplateHtml, info.PostBodyHtml, info.IsRtl, _editingSite.FrameWindow, Lock, _width, _height);
_asyncOps.Add(blogId, asyncOperation);
asyncOperation.Failed += new ThreadExceptionEventHandler(asyncOperation_Failed);
asyncOperation.Completed += new EventHandler(asyncOperation_Completed);
asyncOperation.Start();
}
// else we're already fetching
}
}
catch (Exception ex)
{
Trace.Fail("Failed to get preview bitmap for blog(" + blogId + ") and element(" + elementId + "): " + ex);
}
return(null);
}
