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Two Help Classes for WPF Regarding Design

, 13 Jun 2008
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Check if the code is runing from the Designer and set values only to be seen in the Designer.

Introduction

This article shows a combination of two helper classes I wrote for WPF.

Background

For various reasons, I needed to set values to an element only to be shown in the Designer. This is done by the first class. The second class is used by the first to check whether code is running under the Designer.

Set a value to a control only in Design mode

Can you set a value to the DependencyProperty of a DependencyObject in Design mode? Using a custom MarkupExtension, you can. Here is the implementation:

[ContentProperty("Value")]
public class DesignTimeDummy : MarkupExtension
{
    public DesignTimeDummy()
    {
    }

    public object Value { get; set; }

    public override object ProvideValue(IServiceProvider serviceProvider)
    {
        if (Helpers.Designer.InDesignMode)
        {
            return Value;
        }

        return DependencyProperty.UnsetValue;
    }
}

Here are two examples for the XAML code:

<Button Style="{DynamicResource styleName}" 
   Content="{CoreME:DesignTimeDummy Value=DesignContentValue}"/>

or

<Button Style="{DynamicResource styleName}" >
<Button.Content>
<CoreME:DesignTimeDummy>
Dummy </CoreME:DesignTimeDummy>
</Button.Content>
</Button>

where CoreME is an xmlns defined namespace shortcut.

Check to see if it is in Design mode

The above code uses this class:

public static class Designer
{
    private static DependencyObject dummy = new DependencyObject();
    public static bool InDesignMode
    {
        get { return DesignerProperties.GetIsInDesignMode(dummy); }
    }
}

Hope you find them useful.

Blog links

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

aSarafian
Team Leader ALGOSYSTEMS
Greece Greece
I live in Athens Greece and currently I am working with Business scale application with .NET latest technologies
 
I've been developing applications for personal and friends usage with C++ using majorly Borland's various IDEs since 1994.
In 2002 I began working for an R&D institute where I was introduced to C# which I worships ever since.
 
I love core application development and I would like to publish more articles here and on my blog, but there is not enough time to do so.
 
I usualy "waste" my spare time watching sitcoms, preferable SCI-FI.
I would like to play chess but I can't find any real world players to hang out with.

Comments and Discussions

 
GeneralMy vote of 1 Pinmemberganggang8-Jan-09 5:28 

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