Silverlight: Invalid Attribute Type for TargetType="{x:Type TextBlock}"

Just playing around with Silverlight a bit and trying to set a style to apply to all TextBlocks. The following XAML:

<Style TargetType="{x:Type TextBlock}">
   <Setter Property="Margin" Value="10, 10, 10, 10" />
</Style>

Gives me the error Invalid attribute value {x:Type TextBlock} for property TargetType.

I copied and pasted this bit from the MSDN so I'm a little lost as to why I'm getting this error.

EDIT:

Here's the full code I'm attempting now:

<UserControl x:Class="NIRC.Page"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    Width="400" Height="300">
    <UserControl.Resources>
        <Style TargetType="TextBlock">
            <Setter Property="Margin" Value="10" />
            <Setter Property="Foreground" Value="Red" />
        </Style>
    </UserControl.Resources>
    <TextBlock>Hello World!</TextBlock>
</UserControl>

Here's how it looks:

From stackoverflow

• Value of TargetType change to TextBlock only. It should work.

  <Style TargetType="TextBlock">
     <Setter Property="Margin" Value="10, 10, 10, 10" />
  </Style>
  

  Optionally, give it x:Key and the value of this attribute use in your TextBlock as StaticResource.

  <Style x:Key="someStyleName" TargetType="TextBlock">
     <Setter Property="Margin" Value="10, 10, 10, 10" />
  </Style>
  ...
  <TextBlock x:Name="myTextBlock" Text="Silverlight" Style="{StaticResource someStyleName}"/>
  

  Spencer Ruport : When I do this I don't get an error but the style isn't applied to any of the textblocks in the usercontrol.

  CZFox : Give it x:Key attribute and use it in your TextBlock control. I added a sample code to my answer.

  Spencer Ruport : Yeah that works but I'd prefer to not have to do it that way. :(

  Spencer Ruport : Still not sure what the issue is. Oh well.

• Hmm, the following should work and cascade to all textblocks in the usercontrol element.

  <UserControl>
      <UserControl.Resources>
       <Style TargetType="TextBlock">
        <Setter Property="Margin" Value="10" />
       </Style>
      </UserControl.Resources>
      <TextBlock Text="This has a margin of 10 on all sides!" />
  </UserControl>
  

  Edit:
  Is NIRC.Page the correct codebehind for the usercontrol?

  I wish I knew what was wrong, the following works perfect for me in a user control.

  <UserControl x:Class="..."
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Height="300" Width="300">
      <UserControl.Resources>
       <Style TargetType="TextBlock">
        <Setter Property="Margin" Value="10" />
        <Setter Property="Foreground" Value="Red" />
       </Style>
      </UserControl.Resources>
      <TextBlock>Hello World!</TextBlock>
  </UserControl>
  

  Result is red text with a margin of 10px on all sides.

  Spencer Ruport : Edited my post in response to this.

• Silverlight does not support implicit styling via generic Styles (i.e. with a TargetType but without a static resource key - x:Key="") but WPF does.

  You need to explicitly apply Styles using StaticResource references on each instance of your element that you want styled using Style="{StaticResource stylename}".

  The Silverlight toolkit has an Implicit Style Manager (ISM) that gets around this by wrapping Silverlight markup and applying styles from ResourceDictionaries by parsing the content.

• Since what you are trying to do is implicit styling, so far Gordon's answer seems the right one: "Silverlight does not support implicit styling via generic Styles (i.e. with a TargetType but without a static resource key - x:Key="") but WPF does."

  However implicit styles will work with Silverlight 4. See http://www.silverlightshow.net/items/Implicit-Styles-in-Silverlight-4.aspx