Difference between x:Key and x:Name

 Posted by Ddd on 2/24/2011 | Category: WPF Interview questions | Views: 8833 | Points: 40
Answer:

x:Key and x:Name

These are both the XAML attributes that are specified in the declaration of XAML elements.


x:Key:

It is used mainly with the WPF Stylesheets or in ResourceDictionaries.


x is the namespace prefix
Key is the element specified by the x namespace prefix

x:Key is not applicable for user interface elements like the Button

example:
<Window x:Class="WpfApplication1.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1" Height="300" Width="300">
<Window.Resources>

<Style x:Key="One" TargetType="{x:Type Button}">
<Setter Property="Foreground" Value="Green"/>
</Style>
</Window.Resources>
<!--how key is applied-->
<Button Height="100" Width="100" Style="{StaticResource One}" Content="good"/>
</Window>

USES:

using the Key element, we can refer the StyleSheet defined in <Style></Style> tag in some other

<Style></Style> tag or in the declaration of some user interface element.

In the above example, I have mentioned how Key is used to define the Style of a Button.



x:Name:

It is used to mention the names of StyleSheets as well as the user interface controls
example:
<Button Height="100" Width="100" x:Name="mybutton" Content="good"/>

x:Name can also be accessed in the code-behind (.xaml.cs /.xaml.vb), but x:Key cannot be accessed in code behind


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