Comments for Scott's code and other ponderings...

Comment on Code 4004 “Unhandled error in silverlight application” by Scott Leckie

Scott Leckie — Fri, 23 Dec 2011 18:36:57 +0000

Thanks for that, Bryan

Comment on Code 4004 “Unhandled error in silverlight application” by Bryan Sampica

Bryan Sampica — Fri, 23 Dec 2011 13:59:22 +0000

Thanks for this little tidbit: I started hitting this error, though my circumstances were different. I'm using SIlverlight 5 and RIA services, but I'm doing most of the work in a derived class, and wiring up a Context in the code behind.
I have client side validation using class attributes, as well as a custom validator that can only run on the server, so to fix my problem here's what I had to do:
context.SubmitChanges().Completed += (so,ea) =>
{
if (((SubmitOperation)so).HasError) ((SubmitOperation)so).MarkErrorAsHandled();
// Rest of the work I do on completion
}

Comment on Iterating through a bunch of folders and files by Scott Leckie

Scott Leckie — Fri, 23 Dec 2011 01:21:46 +0000

Hi Christian

apologies for the delay in responding. The addFolder and addFile methods tend to be application specific. In this case, the iterator was part of an application that was displaying volume usage as a tree diagram. As an aside, the entire source is available at http://www.scottleckie.com/2010/04/filetreeview_source_1-0-0-0/

The methods that are called for addFolder and addFile are shown below

///

/// Creates a new folder object, based

/// on the info provided in name and path, and adds it to the

/// object that is the parent folder.

/// The parent folder is looked up by checking the dictionary

/// of previously discovered folders for a matching path. The parent

/// must already have been created!

///

/// Path of the parent folder

/// Name of the folder to be added

/// Full path of the folder to ne added (parent + name)

/// The of the new folder

///

/// One of the parent, name or path parameters is null or empty

///

/// The referred to by the parent

/// parameter does not refer to a previously discovered folder

///

private FileTreeEntry AddFolder(string parent, string name, string path)

{

if (string.IsNullOrEmpty(parent))

throw new ArgumentException("Must supply a parent folder");

if (string.IsNullOrEmpty(name))

throw new ArgumentException("Must supply a name");

if (string.IsNullOrEmpty(path))

throw new ArgumentException("Must supply a path");

FileTreeEntry parentFolder = listOfFolders[parent];

FileTreeEntry newFolder = parentFolder.AddFolder(name, path);

listOfFolders.Add(path, newFolder);

listOfEntries.Add(newFolder);

workerThreadInfo.NumFolders++;

return newFolder;

}

///

/// Creates a new file object, based

/// on the info provided in name, and adds it to the

/// object that is the parent folder.

/// The parent folder is looked up by checking the dictionary

/// of previously discovered folders for a matching path. The parent

/// must already have been created!

///

/// Path of the parent folder

/// Name of the file to be added

/// Size of the file to be added

/// The of the new file

///

/// One of the parent or name parameters is null or empty

///

/// The referred to by the parent

/// parameter does not refer to a previously discovered folder

///

private FileTreeEntry AddFile(string parent, string name, long size)

{

if (string.IsNullOrEmpty(parent))

throw new ArgumentException("Must supply a parent folder");

if (string.IsNullOrEmpty(name))

throw new ArgumentException("Must supply a name");

FileTreeEntry parentFolder = listOfFolders[parent];

FileTreeEntry newFile = parentFolder.AddFile(name, size);

listOfEntries.Add(newFile);

workerThreadInfo.NumFiles++;

workerThreadInfo.TotalFileSize += (ulong) size;

return newFile;

}

Comment on Iterating through a bunch of folders and files by Christian

Christian — Sun, 06 Nov 2011 21:42:50 +0000

Hi Scott,
would it be possible to publish the code for the "addFolder" and "addFile" procedure?
Maybe a complete sample code would make your article much easier to reproduce.
Chris

Comment on Complete Silverlight 4 training videos at channel9 by Ashok

Ashok — Sat, 15 Oct 2011 05:26:05 +0000

Hi Griffiths
Im ashok presently working as Silverlight Developer And I benefited mostly from videos which prent in your site.
Thanx
Ashok

Comment on Code 4004 “Unhandled error in silverlight application” by Steve Osborne

Steve Osborne — Thu, 22 Sep 2011 20:43:04 +0000

Thank you Siclesia. Your suggestion worked for me:
"You can set-up a break point in App.xaml.cs @ private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
this will show the exception detail."

Comment on FileTreeView – a SequioaView-like Application by Scott Leckie

Scott Leckie — Mon, 12 Sep 2011 22:35:53 +0000

OK, so maybe I could be a little tetchy cos I wrote it but;

a) Room for improvement... such as....?

b) that would be the close button. Like every other Windows app.

I'm happy to invite comments but, cheez, at least make them constructive...

End of rant.

Comment on FileTreeView – a SequioaView-like Application by Jorpho

Jorpho — Fri, 19 Aug 2011 02:40:40 +0000

I was reaching for SequoiaView again when I stumbled upon this. It… has a lot of room for improvement.

For starters, what the H311 is the “x-button” ?!

Comment on RC of Entity Framework 4.1 (including EF Code First) is released by Scott Leckie

Scott Leckie — Wed, 10 Aug 2011 22:36:47 +0000

Yep – spotted that today – it's also best to update nuget to ensure that you get the latest version of EF

Comment on RC of Entity Framework 4.1 (including EF Code First) is released by Rami AbuGhazaleh

Rami AbuGhazaleh — Fri, 05 Aug 2011 07:08:37 +0000

In regards to the following exception:
System.InvalidOperationException: This operation requires a connection to the ‘master’ database. Unable to create a connection to the ‘master’ database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection. System.Data.SqlClient.SqlException: Login failed for user ‘sa’

Entity Framework 4.1 Update 1 contains a bug fix to remove the need to specify ‘Persist Security Info=True’ in the connection string when using SQL authentication.
http://www.microsoft.com/download/en/details.aspx?id=26825