?
Solved

XAML TemplateBinding to a Dependency Property

Posted on 2010-08-27
3
Medium Priority
?
1,751 Views
Last Modified: 2013-11-27
I have created my own User Control which is based on Button. Inside myButton I want a small icon depicting the type of myButton. If I hardcode the image source in the button template everything works great. But I would like to programmatically/declaratively show different icons inside myButton based on a dependency property which I have created zIcon. The XAML template code which should take care of this is simply:

    <Image Source="{TemplateBinding zIcon}"/>

However, when I run this code I get an immediate error:

    "The Given key was not present in the dictionary"

I assume it is talking about my dependency property zIcon somehow not being in the dictionary? As you can see in the code below, that TemplateBinding technique works great for setting the Content but doesn't work for a custom dependency property. Any suggestions about how to remedy this?

P.S. I have not included the dependency property class/code snippet. Suffice it to say, zIcon shows up just fine in the Visual Studio Properties window for myButton.


<UserControl.Resources>
        <ControlTemplate x:Key="thisTemplate" TargetType="{x:Type Button}">
            <Button x:Name="thisButton" />
            <ControlTemplate.Triggers>
                    <!-- Only a native Button type has IsPressed, myButton does not-->
                <Trigger Property="IsPressed" Value="True">
                    <Setter TargetName="thisButton" Property="Background" Value="LightGray" />
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

        <Style TargetType="{x:Type uCtrl:myButton}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type uCtrl:myButton}">
                        <Button x:Name="thisButton" Width="100" Height="30" 
                                    BorderBrush="Transparent" Background="Transparent">
                            <Button.Content>
                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
                                    <Image Source="{TemplateBinding zIcon}"/>
                                    <ContentPresenter VerticalAlignment="Center" Content="{TemplateBinding Content}" />
                                </StackPanel>
                            </Button.Content>
                        </Button>
                        <ControlTemplate.Triggers>
                            <!-- This trigger will not work if I place it in the ControlTemplate definition -->
                            <Trigger Property="IsMouseOver" Value="True">
                                <Setter TargetName="thisButton" Property="Background" Value="LightCyan" />
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Resources>
    
    <Grid>
        <Button x:Name="btnPageType" Template="{StaticResource thisTemplate}" />
    </Grid>
</UserControl>

Open in new window

0
Comment
Question by:esc_toe_account
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 10

Expert Comment

by:k_swapnil
ID: 33553707
In your usercontrol, make a dependency property say myButtonImage.
Now bind this property to the image source.

While using your custombutton set this property to the image path you wish to display on the button.

I think this would work... I you face any problem just let me know...

Thx!
Swaps...
0
 

Author Comment

by:esc_toe_account
ID: 33557890
Thanks for your suggestion. I guess I should have been more explicit - the property zIcon is already a dependency property (same as myButtonImage would be). And the error I got/posted above is what happens when I implemented the code as you described.
0
 

Accepted Solution

by:
esc_toe_account earned 0 total points
ID: 33558931
I have found the answer. It is to replace:

    <Image Source="{TemplateBinding zIcon}"/>

with

    <Image Source="{Binding Path=zIcon, RelativeSource={RelativeSource TemplatedParent}}"

0

Featured Post

New feature and membership benefit!

New feature! Upgrade and increase expert visibility of your issues with Priority Questions.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

For a while now I'v been searching for a circular progress control, much like the one you get when first starting your Silverlight application. I found a couple that were written in WPF and there were a few written in Silverlight, but all appeared o…
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
This is Part 3 in a 3-part series on Experts Exchange to discuss error handling in VBA code written for Excel. Part 1 of this series discussed basic error handling code using VBA. http://www.experts-exchange.com/videos/1478/Excel-Error-Handlin…
This is my first video review of Microsoft Bookings, I will be doing a part two with a bit more information, but wanted to get this out to you folks.

719 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question