These classes are to report some behavior aspects of a dependency property.

Check the different classes for the options they provide.

For example, 

if you just want to back a property by dp and provide a default value, use `PropertyMetadata`,

if you want to specify animation behavior, use `UIPropertyMetadata`,

but if some property affects wpf framework level stuffs eg element layout, parent layout or databinding, use `FrameworkPropertyMetadata`.

Details you can check on msdn http://msdn.microsoft.com/en-us/library/ms751554.aspx

Example:

    #include &lt;iostream&gt;
    
    using namespace std;
    
    int main()
    {
    	wchar_t en[] = L&quot;Hello&quot;;
    	wchar_t ru[] = L&quot;Привет&quot;; //Russian language
    	cout &lt;&lt; ru
    		 &lt;&lt; endl
    		 &lt;&lt; en;
    	return 0;
    }

This code only prints HEX-values like adress.
How to print the wchar_t string?

How I can print the wchar_t values to console?

I find smart pointers to be a lot more comfortable than raw pointers. So is it a good idea to **always** use smart pointers? ( Please note that I am from Java background and hence don&#39;t much like the idea of explicit memory management. So unless there are some serious performance issues with smart pointers, I&#39;d like to stick with them. )

Note: Though I come from Java background, I understand the implementation of smart pointers and the concepts of RAII quite well. So you can take this knowledge for granted from my side when posting an answer. I use static allocation almost everywhere and use pointers only when necessary. My question is merely: **Can I always use smart pointers in place of raw pointers???**

Is it a good practice to always use smart pointers?

When looking at sample attached properties and behaviors, I&#39;ve seen a mishmash of uses of ` FrameworkPropertyMetadata`, `UIPropertyMetadata` and `PropertyMetadata`. Since they all form an inheritance hierarchy, how do I choose which one to use?


When should I use FrameworkPropertyMetadata or UIPropertyMetadata over plain PropertyMetadata?

<p>When looking at sample attached properties and behaviors, I've seen a mishmash of uses of <code> FrameworkPropertyMetadata</code>, <code>UIPropertyMetadata</code> and <code>PropertyMetadata</code>. Since they all form an inheritance hierarchy, how do I choose which one to use?</p>


How can I disable selecting in a WPFTooklit&#39;s `DataGrid`?
I tried modifying the solution that works for `ListView` (from https://stackoverflow.com/questions/1051215/wpf-listview-turn-off-selection#comment-863179), but that doesn&#39;t work:

	&lt;tk:DataGrid&gt;
		&lt;tk:DataGrid.ItemContainerStyle&gt;
			&lt;Style TargetType=&quot;{x:Type tk:DataGridRow}&quot;&gt;
				&lt;Setter Property=&quot;Focusable&quot; Value=&quot;false&quot;/&gt;
			&lt;/Style&gt;
		&lt;/tk:DataGrid.ItemContainerStyle&gt;
		&lt;tk:DataGrid.CellStyle&gt;
			&lt;Style TargetType=&quot;{x:Type tk:DataGridCell}&quot;&gt;
				&lt;Setter Property=&quot;Focusable&quot; Value=&quot;false&quot;/&gt;
			&lt;/Style&gt;
		&lt;/tk:DataGrid.CellStyle&gt;
	&lt;/tk:DataGrid&gt;

Disable selecting in WPF DataGrid

I have a simple WPF form with a `Grid` declared on the form. This `Grid` has a bunch of rows:

    &lt;Grid.RowDefinitions&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; MinHeight=&quot;30&quot; /&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; Name=&quot;rowToHide&quot; /&gt;
        &lt;RowDefinition Height=&quot;Auto&quot; MinHeight=&quot;30&quot; /&gt;
    &lt;/Grid.RowDefinitions&gt;

The row named `rowToHide` contains a few input fields and I want to hide this row after I detect I don&#39;t need these fields. It&#39;s simple enough to just set `Visibility = Hidden` to all items in the row, but the row still takes up space in the `Grid`. I tried setting `Height = 0` to the items, but that didn&#39;t seem to work.

You can think of it like this: You have a form, in there you have a drop down saying &quot;Payment Type&quot;, and if the person selects &quot;Cash&quot;, you want to hide the row containing the Card details. It isn&#39;t an option to start the form with this hidden already.

Hide grid row in WPF

I use the following DataGrid

    &lt;DataGrid Grid.Row=&quot;1&quot; Grid.Column=&quot;1&quot; Name=&quot;Grid&quot; ItemsSource=&quot;{Binding}&quot;  AutoGenerateColumns=&quot;False&quot; &gt;
                &lt;DataGrid.Columns&gt;
                    &lt;DataGridTextColumn Header=&quot;Name&quot; Width=&quot;100&quot; Binding=&quot;{Binding Path=Name}&quot;&gt;&lt;/DataGridTextColumn&gt;
                    &lt;DataGridTextColumn Header=&quot;OldValue&quot; Width=&quot;100&quot; Binding=&quot;{Binding Path=OldValue}&quot;&gt;&lt;/DataGridTextColumn&gt;
                    &lt;DataGridTextColumn Header=&quot;NewValue&quot; Width=&quot;100*&quot; Binding=&quot;{Binding Path=NewValue}&quot;&gt;&lt;/DataGridTextColumn&gt;
                &lt;/DataGrid.Columns&gt;
            &lt;/DataGrid&gt;

How can I make the cells readonly?

WPF DataGrid: Make cells readonly

I&#39;m needing to display a list of numbers from a collection in an Items Control.  So the items are: `&quot;1&quot;, &quot;2&quot;, &quot;3&quot;`.

When they are rendered, I need them separated by a comma (or something similar).  So the above 3 items would look like this: `&quot;1, 2, 3&quot;`.

How can I add a separator to the individual items, without having one tacked on the end of the list?

I am not stuck on using an ItemsControl, but that&#39;s what I had started to use.

How can a separator be added between items in an ItemsControl

In my particular case, I want to bind to the IsReadOnly property of a TextBox to set the Content property of a Button? They are both part of the same StackPanel.

I&#39;ve tried doing it with a DataTrigger with a Binding to the ElementName of the TextBox and a Trigger using the TextBox name as the SourceName.

Any thoughts?

How do I bind to another control&#39;s property from a trigger?

I try to use binding with an attached property. But can&#39;t get it working.

    public class Attached
    {
        public static DependencyProperty TestProperty =
            DependencyProperty.RegisterAttached(&quot;TestProperty&quot;, typeof(bool), typeof(Attached),
            new FrameworkPropertyMetadata(false, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault | FrameworkPropertyMetadataOptions.Inherits));

        public static bool GetTest(DependencyObject obj)
        {
            return (bool)obj.GetValue(TestProperty);
        }

        public static void SetTest(DependencyObject obj, bool value)
        {
            obj.SetValue(TestProperty, value);
        }
    }

The XAML Code:

    &lt;Window ...&gt;
        &lt;StackPanel local:Attached.Test=&quot;true&quot; x:Name=&quot;f&quot;&gt;
            &lt;CheckBox local:Attached.Test=&quot;true&quot; IsChecked=&quot;{Binding (local:Attached.Test), Mode=TwoWay, RelativeSource={RelativeSource Self}}&quot; /&gt;
            &lt;CheckBox local:Attached.Test=&quot;true&quot; IsChecked=&quot;{Binding (local:Attached.Test), Mode=TwoWay}&quot; /&gt;
        &lt;/StackPanel&gt;
    &lt;/Window&gt;


And the Binding Error:

    System.Windows.Data Error: 40 : BindingExpression path error: &#39;(local:Attached.Test)&#39; property not found on &#39;object&#39; &#39;&#39;StackPanel&#39; (Name=&#39;f&#39;)&#39;. BindingExpression:Path=(local:Attached.Test); DataItem=&#39;StackPanel&#39; (Name=&#39;f&#39;); target element is &#39;CheckBox&#39; (Name=&#39;&#39;); target property is &#39;IsChecked&#39; (type &#39;Nullable`1&#39;)


Content Type	Original Author	Original Content on Stackoverflow
Question	Roger Lipscombe	View Question on Stackoverflow
Solution 1 - Wpf	gp.	View Answer on Stackoverflow

When should I use FrameworkPropertyMetadata or UIPropertyMetadata over plain PropertyMetadata?

Wpf Problem Overview

Wpf Solutions

Solution 1 - Wpf

Is it a good practice to always use smart pointers?

How I can print the wchar_t values to console?

Attributions