Attached Behavior

[Jan]

Hi,

I started evaluation JustCode and thus far I am very happy with it.

One "Warning" that is reported erroneously IMHO is a XAML warning for "XAML: Unknown property 'X' of type 'Foo'"

This happens if I define a standard Attached Behavior as follows:

public class Foo
{
    public static readonly DependencyProperty XProperty =
        DependencyPropery.RegisterAttached
             ("X", typeof(object), typeof(Foo), new UIPropertyMetaData(null));

    public static void SetX(DependencyObject target, object value)
    {
         target.SetValue(XProperty, value);
    }

    public static void GetX(DependencyObject target)
    {
        return target.GetValue(XProperty);
    }
}

I hope there are no nasty typos in the above example. We now have a basic attached property wrapped in a class. This behavior obviously does nothing, but we don't need that for the example.

JustCode will now generate the warning cited above (namespacing etc. omitted for brevity)
XAML: Unknown property 'X' of type 'Foo'

The issue is obviously that JustCode is looking for the CLR properties to back the X property - but those are not present in the case of attached properties / attached behaviors.
See also http://msdn.microsoft.com/en-us/library/ms749011.aspx 

Or am I missing something really basic here.

Cheers,
Jan

[Ivan]

Hi,

Thank you for your feedback. I tried to reproduce your issue, but I was not able to.
Could you try refreshing the code analysis from JustCode->Analysis->Refresh Code Analysis. If the warning is still shown after the refresh, could you send me a sample solution that reproduces this issue?
Thank you for your help!

All the best,
Ivan
the Telerik team

[Jan]

Upon further investigation, the warning occurs with write-only Dependency properties.

I sat down and created an example for you to see -- attached.

Rename the attached file to zip -- it contains the example solution that ehibits the problem boiled down very narrowly.

Cheers,
Jan

PS: doesn't let me attach zip files or a renamed zip file;
so here's the code:

Maindow.xaml

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:ab="clr-namespace:AttachedBehaviors"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <TextBox x:Name="m_tb1"/>
        <TextBox ab:SomeBehavior.X="{Binding m_tb1}"/>
    </Grid>
</Window>

SomeBehavior.cs

namespace AttachedBehaviors
{
    using System;
    using System.Linq;
    using System.Windows;

    public class SomeBehavior
    {
        public static readonly DependencyProperty XProperty =
            DependencyProperty.RegisterAttached("X", typeof(UIElement), typeof(SomeBehavior), new UIPropertyMetadata(XChanged));

        public static void SetX(DependencyObject target, UIElement value)
        {
            target.SetValue(XProperty, value);
        }

        private static void XChanged(DependencyObject target, DependencyPropertyChangedEventArgs e)
        {
            // do things :)
        }
    }
}

All other code was unchanged from the WPF app skeleton.

Cheers,
Jan

[Svetlozar]

Hello,

Thank you for the example provided! I logged it in our system for further investigation.

All the best,
Svetlozar
the Telerik team