Windows 10 – Fixing Windows Store crash

I’ve just updated my machines to the latest Windows 10 build 10240 (download available from here) and noticed that the Store app was no more starting up since crashing when launched in a specific PC.

After some investigations I cleared the content of the following local folder and all started to work correctly:

Hope this helps!

NDepend v4.1 adds CQLinq killer feature and support for Windows Store apps

I already blogged about NDepend basic features here: I was positively impressed by the capabilities of this tool by fellow MVP Patrick Smacchia.

NDepend permits you to examine .NET projects and highlight different metrics in the code in order to better analyse what areas of your solution needs refactoring for improving performance, code maintainability, application stability and applying best coding practices (just to name a few).

Some features, already available in the previous versions of NDepend, include tools for visually representing dependencies between classes, defining custom rules on code, explore code diffs and analyse code coverage. These ones are particularly helpful when the size of the project grows: a visual representation helps the developer to better identify areas that needs more work (and then save development time).

Recently Patrick contacted me for highlighting the new features available in NDepend v4.1. I was very pleased to find support for Windows Store apps but another capability got immediately my attention: CQLinq.

This is a killer feature: CQLinq (acronym for Code Query LINQ) enables the developer “to query the code” for retrieving information about it. Some simple examples of queries could be:

  • find me the methods too big / too complex;
  • find the methods added but poorly covered by tests;
  • get information about naming conventions;
  • any other query you like: the possibilities are not limited at all!

Technically these queries can be constructed using the traditional LINQ syntax and the types defined in the NDepend.CoreModel of the NDepend API.

The best place to start using CQLinq is here by exploring the dedicated section on the site which contains a ton of different examples to start: I recommend to try and run the available samples which are an excellent starting point and then modifying them for custom queries.

I’ve been really impressed by CQLinq and I can’t wait to use it on real projects to enhance the quality of the code and then reduce the time needed for new implementations.

Happy coding everyone!

Windows Phone 7, Multi-Touch Behaviors and the Surface samples for Silverlight

I’ve just finished some experiments using the Windows Phone 7 emulator and the “Microsoft Surface Manipulations and Inertia Sample for Microsoft Silverlightin order to enable Multi-Touch gestures using Blend Behaviors:


This new implementation, now available for download in the Expression Gallery, permits to enable Multi-Touch gestures (the usual translation, rotation, zoom and inertia) on separate User Controls available in the same container.

In this way you can apply distinct Multi-Touch manipulations (inertia included) to single elements using a single code in xaml:



Alternatively you can use Blend inserting a reference to the project MultiTouch.Behaviors.Silverlight.WP7 and then dragging the MultiTouchManipulationBehavior from the Assets section to the  control to be touch-enabled:

Multi-Touch Behavior Blend



This one has been an interesting exercise in porting code written for Silverlight to Windows Phone: I had only to create a Windows Phone 7 project and add to it the code already available for the Silverlight version and all worked well quite quickly.


At this time the behavior works only in the fixed Portrait orientation of Windows Phone: if you change to Landscape the manipulation doesn’t work well. I’ll have to investigate further and currently I don’t have a physical device to test (I’d really love to have a device to try it :)).

Happy Silverlighting!

A WPF custom control for enabling Windows 7 Multi-touch gestures

Windows 7 is now available, it’s time to build new user experiences using the new stuff, like multi-touch!

To play with this new feature, I have started a Codeplex project at containing a first WPF custom control (and some Silverlight 3 behaviors, check out the next posts for more info) to enable touch drag, zoom and rotation gestures using the .NET wrapper classes available on (see also my other post about the same topic).

The touch events are managed in the ApplyTemplate method:

       public override void OnApplyTemplate()

            if (Windows7.Multitouch.TouchHandler. DigitizerCapabilities.IsMultiTouchReady)
                //Find the Window containing the CustomControl
                DependencyObject dpParent = this;
                do { dpParent = LogicalTreeHelper.GetParent(dpParent); } while (dpParent.GetType().BaseType != typeof(Window));
                //Enable Stylus events
                if (dpParent != null) Factory.EnableStylusEvents(dpParent as Window);

                //Get the touch Area
                UIElement touchArea = (UIElement)GetTemplateChild("_touchArea");

                //Handle Stylus events
                if (touchArea != null)
                   this.StylusDown += (s, e) => { _processor.ProcessDown((uint)e.StylusDevice.Id, e.GetPosition(touchArea).ToDrawingPointF()); };
                   this.StylusUp += (s, e) => { _processor.ProcessUp((uint)e.StylusDevice.Id, e.GetPosition(touchArea).ToDrawingPointF()); };
                   this.StylusMove += (s, e) => { _processor.ProcessMove((uint)e.StylusDevice.Id, e.GetPosition(touchArea).ToDrawingPointF()); };

                   //Handle the ManipulationDelta and the gestures
                   this._processor.ManipulationDelta += ProcessManipulationDelta;
                   this._processor.PivotRadius = 2;

When the ManipulationDelta event occurs, the ProcessManipulationDelta handler applies the Rotate, Translate and Scale transforms:

        private void ProcessManipulationDelta(object sender, ManipulationDeltaEventArgs e)
            if (this.MultiTouchEnabled)
                TranslateTransform _translate = (TranslateTransform)GetTemplateChild("_translate");
                if (_translate != null)
                    _translate.X += e.TranslationDelta.Width;
                    _translate.Y += e.TranslationDelta.Height;

                RotateTransform _rotate = (RotateTransform)GetTemplateChild("_rotate");
                if (_rotate != null)
                    _rotate.Angle += e.RotationDelta * 180 / Math.PI;

                ScaleTransform _scale = (ScaleTransform)GetTemplateChild("_scale");
                if (_scale != null)
                    _scale.ScaleX *= e.ScaleDelta;
                    _scale.ScaleY *= e.ScaleDelta;

A dependency property named MultiTouchEnabled is also defined in order to enable and disable the touch features directly using XAML:

        public bool MultiTouchEnabled
            get { return (bool)GetValue(MultiTouchEnabledProperty); }
            set { SetValue(MultiTouchEnabledProperty, value); }

        public static readonly DependencyProperty MultiTouchEnabledProperty =
            DependencyProperty.Register("MultiTouchEnabled", typeof(bool), typeof(MultiTouchView), null);

The usage of this custom control is very simple, just wrap the code you want to touch-enable in this way:

<Window x:Class="WpfMultiTouch.MultiTouchWindow"
    xmlns=" presentation"
    Title="WPF Multi Touch gestures example" Width="1280" Height="800"
    xmlns:myControls="clr-namespace:MultiTouch.Controls.WPF; assembly=MultiTouch.Controls.WPF"
    <Canvas Background="Black">
        <myControls:MultiTouchView MultiTouchEnabled="True">
                    <Canvas x:Name="_touchArea">
                        <Viewbox RenderTransformOrigin="0.5, 0.5">
                            <Image Source="Images/image.png" Width="500"/>
                                    <RotateTransform x:Name="_rotate" Angle="0"/>
                                    <ScaleTransform x:Name="_scale" ScaleX="1" ScaleY="1"/>
                                    <TranslateTransform x:Name="_translate" X="0" Y="0"/>

This approach is very powerful, it’s possible to enable multi-touch gestures by simply wrapping the objects inserted in the XAML code inside the MultiTouchView custom control.

The source code is available on Codeplex, including a basic Silverlight 3 implementation using the new touch APIs and behaviors.

Simon in the cloud: deploying your existing Silverlight application to the Windows Azure platform

Windows Azure July 2009 CTP is now available: you can download the Windows Azure Tools for Microsoft Visual Studio from here.

It’s now possible to associate an ASP.NET Web Application project in a Cloud Service solution as a Web Role: in this way it’s pretty simple to deploy a Silverlight Web application to Windows Azure without making any change.

To try this new feature, I’ve deployed the Silverlight version of Simon (I already blogged about this cool project by David J Kelley), you can try it here:

How to achieve this task?

First of all install the Windows Azure Tools for Microsoft Visual Studio July 2009 CTP and then request a token in order to create your Azure application (detailed information are available in this great tutorial).

Then, open your Silverlight solution and add a new “Cloud Service” project (I’ve named it “SimonAzureService“).


Inside this new project, right click the section “Roles“->”Add“->”Web Role Project in solution” and select your Silverlight Web application project (“SimonSilverlight.Web“).


Done! You can now right click the “Cloud Service” project and publish it using the Windows Azure portal.


A quick tip: if your Silverlight plug-in is hosted on a simple html page (Index.html, for example), you have to modify the web.config file and add the following setting in the <system.Webserver> section:

<add value=”Index.html”/>

All the source code is available for download from the project site on codeplex.

Multi Touch enabling your WPF application

Recently I had the possibility to work on some multi-touch stuffs using the .NET wrappers for the touch APIs included in Windows 7 RC.

Do you remember Simon? As described by Wikipedia:

Simon is an electronic game of rhythm and memory skill invented by Ralph H. Baer and Howard J. Morrison,[1] with the software programming being done by Lenny Cope and manufactured and distributed by Milton Bradley. Simon was launched in 1978 at Studio 54 in New York City and became an immediate success. It became a pop culture symbol of the 1980s.”

And… here we go, let’s connect to and play with the Silverlight on-line version built by David J Kelley:


How to add basic multi touch gestures (rotation, scale and transform) to the WPF version? It’s quite impressive to look at the amount of code required using the Windows 7 Multitouch .NET Interop Sample Library: just insert some transforms in the User Control XAML

<Viewbox x:Name="_simon" RenderTransformOrigin="0.5, 0.5">
<RotateTransform x:Name="_rotate" Angle="0"/>
<ScaleTransform x:Name="_scale" ScaleX="1" ScaleY="1"/>
<TranslateTransform x:Name="_translate" X="0" Y="0"/>

And then use this code to control the TransformGroup using the Multi touch engine:

using System;
using System.Windows;
using Windows7.Multitouch.Manipulation;
using Windows7.Multitouch.WPF;

namespace SimonWPF
public partial class MultiTouchWindow1 : Window
ManipulationProcessor _processor = new ManipulationProcessor(ProcessorManipulations.ALL);

public MultiTouchWindow1()

Loaded += (s, e) => { Factory.EnableStylusEvents(this); };

StylusDown += (s, e) => { _processor.ProcessDown((uint)e.StylusDevice.Id,
e.GetPosition(_canvas).ToDrawingPointF()); };

StylusUp += (s, e) => { _processor.ProcessUp((uint)e.StylusDevice.Id,
e.GetPosition(_canvas).ToDrawingPointF()); };

StylusMove += (s, e) => { _processor.ProcessMove((uint)e.StylusDevice.Id,
e.GetPosition(_canvas).ToDrawingPointF()); };

_processor.ManipulationDelta += ProcessManipulationDelta;
_processor.PivotRadius = 2;

private void ProcessManipulationDelta(object sender, ManipulationDeltaEventArgs e)
_translate.X += e.TranslationDelta.Width;
_translate.Y += e.TranslationDelta.Height;

_rotate.Angle += e.RotationDelta * 180 / Math.PI;

_scale.ScaleX *= e.ScaleDelta;
_scale.ScaleY *= e.ScaleDelta;

It’s also possible to verify if your hardware supports multi touch:

if (Windows7.Multitouch.TouchHandler.
//MultiTouch is available
this.StartupUri = new Uri("MultiTouchWindow1.xaml", UriKind.Relative);
else this.StartupUri = new Uri("Window1.xaml", UriKind.Relative);

The complete code is available on CodePlex:

Enjoy Windows 7 Multi touch! And now… waiting for Silverlight 3 🙂

The multi touch library is governed by this license.

Windows 7 multi-touch programming

Some useful resources about this topic:

The Apache Software Foundation welcomes Microsoft as a Platinum Sponsor

From the website: 

“At OSCON, Microsoft announced their Sponsorship of The Apache Software Foundation, joining Google and Yahoo! at Platinum level. The generous contributions by Sponsoring organizations and individuals help offset the day-to-day operating expenses to advance the work of The ASF.”

More information by Sam Ramji can be found here.