Calvin and Hobbes for October 27, 2010

Calvin and Hobbes for October 27, 2010: ""

Handling DataGrid.SelectedItems in an MVVM-friendly manner

Handling DataGrid.SelectedItems in an MVVM-friendly manner: "

An interesting question from one of the MVVM Light users today:

Is there an MVVM-friendly way to get a DataGrid’s SelectedItems into the ViewModel?

The issue there is as old as the DataGrid (that’s not very old but still): SelectedItem (singular) is a DependencyProperty and can be databound to a property in the ViewModel. SelectedItems (plural) is not a DependencyProperty.

Thankfully the answer is very simple: Use EventToCommand to call a Command in the ViewModel, and pass the SelectedItems collection as parameter. For example, if the command in the ViewModel is declared as follows:

public RelayCommand<IList> SelectionChangedCommand
{
  get;
  private set;
}

and (in the MainViewModel constructor):

SelectionChangedCommand = new RelayCommand<IList>(
  items =>
  {
      if (items == null)
      {
          NumberOfItemsSelected = 0;
          return;
      }

      NumberOfItemsSelected = items.Count;
  });

Then the XAML markup becomes:

<sdk:DataGrid x:Name="MyDataGrid"
              ItemsSource="{Binding Items}">
  <i:Interaction.Triggers>
      <i:EventTrigger EventName="SelectionChanged">
          <cmd:EventToCommand
              Command="{Binding SelectionChangedCommand}"
              CommandParameter="{Binding SelectedItems,
                  ElementName=MyDataGrid}" />
      </i:EventTrigger>
  </i:Interaction.Triggers>
</sdk:DataGrid>

I slapped a quick sample and published it here (VS2010, SL4 but the concept works in SL3 and WPF too).

Cheers!

Laurent

Laurent Bugnion (GalaSoft)
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"

WCF

WCF : BasicHttpBinding compared to WSHttpBinding at SOAP packet level. *** http://geekswithblogs.net/claeyskurt/archive/2008/04/22/121508.aspx

Winterdom » Blog Archive » WCF Configuration Complexity ** http://winterdom.com/2007/02/wcfconfigurationcomplexity

WCF Binding: BasicHttpBinding vs WsHttpBinding - Fabian's Blog ** http://www.apexa.net/Blog/web_design_Blog_20080911.aspx

Configuring Message Logging – MSDN ** http://msdn.microsoft.com/en-us/library/ms731859.aspx

Stephen Covey’s Five Metastasizing cancers

Watch out for an organizational culture that produces any of these five:
1.    Criticizing
2.    Complaining
3.    Comparing
4.    Competing
5.    Contending

The above culture shows a victim mentality. Instead, strive to uphold the following values in your organization:
1.    Gratitude
2.    Forgiveness
3.    Abundance

Websites

Interview You need to identify this type of applicant quickly & the quickest way is the short coding interview. You don't even have to have them come into the office. Get a private site right here where you can watch your job candidate write code over the internet in real-time.

http://i.seemikecode.com/

Task management - Online http://www.producteev.com/

Photo Gallery http://tympanus.net/codrops/2010/06/27/beautiful-photo-stack-gallery-with-jquery-and-css3/

Simple Diagrams A small desktop application that helps you express your ideas quickly and simply. There's just enough functionality to describe a thought or capture a process. It keeps the visual expression clear through the simple design of library items and backgrounds.   http://www.simplediagrams.com/   We Used To Wait http://www.thewildernessdowntown.com An interactive short film for Arcade Fire's "We Used to Wait" track, utilizing Google's Chrome Browser, Google Maps and HTML5 http://www.thefwa.com/article/fwa-site-of-the-year-2010

Smart Answer

RSA Animate - Changing Education Paradigms

 

http://sirkenrobinson.com/skr/

Silverlight Offline Mode

Google Gears - Maybe all Rich Internet App needed was Local Storage and an Offline Mode - Scott Hanselman http://www.hanselman.com/blog/GoogleGearsMaybeAllRichInternetApplicationsNeededWasLocalStorageAndAnOfflineMode.aspx

Silverlight + Google Gears = Awesome! at least in Firefox                       http://www.mojoportal.com/silverlight-google-gears-awesome-at-least-in-firefox.aspx

Even a chimp can write code: Google Gears and Silverlight http://nerddawg.blogspot.com/2007/06/google-gears-and-silverlight.html

Microsoft Silverlight Offline Database Storage - Infosys http://www.infosysblogs.com/microsoft/2008/08/silverlight_offline_database_s.html

The Debut Of Cheteshwar Pujara

2nd Test: India v Australia at Bangalore - Oct 9-13, 2010

India 2nd innings (target: 207 runs)

CA Pujara b Hauritz 72 (89)

What a knock, though. You wait five years for the call from selectors. You keep scoring runs.

You finally get that call. You wait for six hours to bat and you get a grubber, a shooter.

You then get promoted ahead of your idol Rahul Dravid in the second innings. And play a super knock. Sometimes, dreams do come true. Sometimes..

http://www.cricinfo.com/india-v-australia-2010/engine/current/match/464527.html

Silverlight Applications

Telerik Recruitrer http://blogs.telerik.com/blogs/posts/10-04-08/silverlight_recruiting_application_wrap-up_and_source_code.aspx

Play free Silverlight games on Mashooo http://www.mashooo.com/SilverlightGames.aspx#Games

Expression Blend templates, Part 1 – Understanding templates http://expressioniq.com/?p=60

The SpiderWebControl for Silverlight http://blog.pixelingene.com/?p=500

Tech Tools

Convert VB >> C# or C# >> VB http://converter.telerik.com/ Blogging Tools http://www.smashingmagazine.com/2008/08/01/15-desktop-blogging-tools-reviewed/

Design Patterns

Books Design Patterns: Elements of Reusable Object-Oriented Software *** Head First Design Patterns *** http://www.msquaredweb.com/DesignPatterns/HeadFirstDesignPatternsInCSharp.zip C# 3.0 Design Patterns **

Links Design Patterns Uncovered: The Builder Pattern | Javalobby http://java.dzone.com/articles/design-patterns-builder .NET Design Patterns (GOF) – DoFactory http://www.dofactory.com/Patterns/Patterns.aspx GOF Patterns Series in C# Unleashed http://www.dotnetfunda.com/articles/article605-gof-patterns-series-in-csharp-unleashed.aspx The GOF "Chain of Responsibility" Design Pattern http://www.c-sharpcorner.com/UploadFile/rmcochran/chain_of_command01172007143425PM/chain_of_command.aspx OOP and Design Pattern Resources - David Hayden - CodeBetter.Com http://codebetter.com/blogs/david.hayden/archive/2006/01/18/136713.aspx Design pattern in .NET: template method - Zhanli's - MSDN Blogs http://blogs.msdn.com/b/zhanli/archive/2010/06/26/design-pattern-in-net-template-method.aspx GOF Design Patterns Quick Review. http://www.mydeveloperconnection.com/html/gof_design_patterns.htm Practically Applying Design Patterns – Amazed saint * * * http://amazedsaint.blogspot.com/2008/01/design-patterns-part-i-and-ii.html http://amazedsaint.blogspot.com/2008/01/practically-applying-design-patterns.html http://www.codeproject.com/KB/cpp/applyingpatterns2/applyingpatterns2_src.zip Design Patterns: Object Creational: Abstract Factory http://www.informit.com/articles/article.aspx?p=1398599 Design Patterns in C# http://www.abhisheksur.com/2010/05/design-patterns.html

Coca Cola India – Diwali 2010 Ad

here are the lyrics

jaata kahan hai diwane.. sab kuchh yahaan hai sanam
jab honge hum sath tere.. khushiya chalen sang sang
o raaja tu aaja.. humare sang aaja.. o jhum le zaraa!

ita remix of a song form 1956 movie 'C.I.D'

Download http://cid-7786a33555a957e5.office.live.com/self.aspx/Music/Coca%20Cola%20-%202010%20-%20Diwali%20Special.mp3

Silverlight – Message Box

How to make a Silverlight MessageBox.Show that waits until a choice is made ? – Forum  http://forums.silverlight.net/forums/t/155304.aspx

Refactoring Silverlight ChildWindow for a non-modal use – Tim Heure ** http://timheuer.com/blog/archive/2009/05/10/silverlight-childwindow-non-modal-refactor.aspx

Others * http://www.codeproject.com/KB/silverlight/CustomMessageBox.aspx http://ajdotnet.wordpress.com/2009/11/28/silverlight-bitspieces-part-9-a-messagebox-replacement/ http://www.lyquidity.com/devblog/?p=46

Threading

Using Delegates Asynchronously - O'Reilly Media http://ondotnet.com/pub/a/dotnet/2003/02/24/asyncdelegates.html

Refactoring

Martin Fowler http://www.refactoring.com/sources.html

Neil Ford: 10 Ways to Improve Your Code - InfoQ http://www.infoq.com/presentations/10-Ways-to-Better-Code-Neal-Ford http://nealford.com/downloads/10_Ways_to_Improve_Your_Code(Neal_Ford).pdf

Neal Ford – The Productive Programmer... Part 1        http://www.nealford.com/mypastconferences.htm

Code Smells Listing http://wiki.java.net/bin/view/People/SmellsToRefactorings

Refactoring – examples from the book (Java/JUnit) http://david.koontz.name/home/Projects/Entries/2008/4/13_Photo_of_the_Day.html

Refactoring – Chapter 1 (C#) http://www.thycotic.com/articles/refactoring/Csharphandout.pdf