Solved

XAML TemplateBinding to a Dependency Property

Posted on 2010-08-27
3
1,655 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
  • 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

3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

Question has a verified solution.

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

This document covers how to connect to SQL Server and browse its contents.  It is meant for those new to Visual Studio and/or working with Microsoft SQL Server.  It is not a guide to building SQL Server database connections in your code.  This is mo…
For those of you who don't follow the news, or just happen to live under rocks, Microsoft Research released a beta SDK (http://www.microsoft.com/en-us/download/details.aspx?id=27876) for the Xbox 360 Kinect. If you don't know what a Kinect is (http:…
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…
Both in life and business – not all partnerships are created equal. As the demand for cloud services increases, so do the number of self-proclaimed cloud partners. Asking the right questions up front in the partnership, will enable both parties …

912 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

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now