Anonymous delegates and event execution

A nice little trick to save you always checking for null when firing custom events
Initialize to anonymous delegate.
Ok.. we've an extra call in the invocation list so use judiciously

[code:c#]

public event CompleteTaskExecutionHandler CompleteExecution = delegate { };

//or a sample using Lambdas

public event PropertyChangedEventHandler PropertyChanged = (s,p) => { };

 

 

private void Fire()
{
   this.CompleteExecution(...);
}

 

[/code]

Ajax on the Microsoft Content Delivery Network

You can now start using the ajax toolkit/library without having any sever support Laughing

    <script src="http://ajax.microsoft.com/ajax/beta/0911/Start.js" type="text/javascript"></script>

WPF...Cool 3D browser

Pretty cool app to pass a minute or so http://chriscavanagh.wordpress.com/


Extension Method for Wpf Window with Froms Owner

 

Extension Method

[code:c#]

internal static class InteropExtensions
{
    public static bool? ShowDialog(this System.Windows.Window win, IntPtr handle)
    {
        WindowInteropHelper helper = new WindowInteropHelper(win);
        helper.Owner = handle;
        return win.ShowDialog();
    }
}

[/code]

 

Usage

[code:c#]

var win = new WpfWindow();
win.ShowDalog(windowsFormOwnerHandle);

[/code]

Sql Server Compact Edition

I've been playing with a workflow service hosted here https://www.briankeating.net/PSService/PSService.svc
Feel free to give it a bash [August 2012, removed]) Endpoint is using basic http binding.

Tonight I whipped a Sql Server Compact Database out of another little app I have lying around so I could sit it behind the webservice persist data.

But

To my horror it doesn't work..

I get the following exception " sql compact is not intended for asp.net development"

I can imagine why I guess.. bit what a pity.. it's not allowed..

[August 2012: It is allowed, just needs a setting]

WPF Grid splitters

Addin splitters to the WPF grid couldn't be easier.

Veritcal

<GridSplitter />

Horizontal

<GridSplitter Height="3"
   ResizeDirection="Rows" Background="Transparent"
   HorizontalAlignment="Stretch"
   VerticalAlignment="Stretch" Grid.Row="1" />

WPF Routed events

Ever have a control on a window and want to be able to receive button clicks from this child control?
More than one I've done this the hard way, but now.....

 

[code:c#]

public VariablesWindow()
  {
   this.InitializeComponent();
   variables.AddHandler(Button.ClickEvent, new RoutedEventHandler(HandleChildClick));
  }
  
  private void HandleChildClick(object sender, RoutedEventArgs args)
        {
            Button senderButton = args.OriginalSource as Button;
            if (senderButton != null && senderButton.Content != null)
            {
                string buttonText = senderButton.Content as string;
                if (buttonText == "_Cancel")
                {
                    this.DialogResult = false;
                    Close();
                }
                else if (buttonText == "_OK")
                {
                    this.DialogResult = true;
                    Close();
                }
            }
        }

[/code]

Key modifiers

Recently I used PInvoke to check if the SHIFT key was pressed while i was doing a drag operation......

what I should have done then and have done now is

 

[code:c#]

if((Keyboard.Modifiers & ModifierKeys.Shift) != ModifierKeys.None)
  Trace.WriteLine("Shift is pressed");

[/code]

A Custom Diagramming Library

Recently I've been working with a 3rd party diagramming library written in windows forms. It's been great and it's pretty fast in building 80% of the application I'm working on.

[Update August 2012: I never got around to doing much with the diagramming library. I opted instead to re-host the visual studio workflow designer for my needs, why I actually considered writing it is beyond me, I’m a campaigner for bolting existing solutions together rather than re-inventing the wheel ]

WPF Data Triggers

Today I needed to control the enabled property of a button "Remove Item" on my form depending on weather there was a selected item in a Listbox.

Here's how

[code:c#]
<Button Content="Remove" Click="OnRemoveTranstion">
<Button.Style>
<Style>
    <Style.Triggers>
        <DataTrigger Binding ="{Binding ElementName=listDetails, Path=SelectedIndex}" Value="-1">
            <Setter Property="Button.IsEnabled" Value="false"/>
        </DataTrigger>
    </Style.Triggers>
</Style>
</Button.Style>
</Button>
[/code]

Recent Tweets

Note: For Customization and Configuration, CheckOut Recent Tweets Documentation

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