How to freeze all freezable WPF objects?

Question

I want to freeze all freezable object that are in a window.(to get better performance)

To do it I used several loop like this:

    foreach (Brush item in FindLogicalChildren<Brush>(myWin))
                  if( item != null && item.CanFreeze)item.Freeze();

    foreach (Transform item in FindLogicalChildren<Transform>(myWin))
                   if( item != null && item.CanFreeze)item.Freeze();

    foreach (Geometry item in FindLogicalChildren<Geometry>(myWin))
                   if( item != null && item.CanFreeze)item.Freeze();

But it does not work.

How to call Freeze() on any freezable WPF object?

EDIT:

I just realized that the FindLogicalChildren not find anything, so it does not work.

EDIT2:

How to call Freeze() on any freezable objects by using ONE loop.

Please help me.

Answer 1

You are correct, performance gets a real boost if everything is frozen.

You can do this in XAML.

In all Resource dictionaries, add the ice namespace:

    <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                        xmlns:ice="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options">

Then, for every single XAML element that is freezable, freeze it. Examples:

    <SolidColorBrush ice:Freeze="True" x:Key="GlyphDisabledFillBrush" Color="{StaticResource Color_005}"/>
    <LinearGradientBrush ice:Freeze="True" x:Key="PendingOrderPositiveBrush"  EndPoint="8,8" StartPoint="0,0" SpreadMethod="Repeat"  MappingMode="Absolute">
        <GradientStop ice:Freeze="True" Color="{StaticResource PendingOrderLightPositiveColor}" Offset="0"/>
        <GradientStop ice:Freeze="True" Color="{StaticResource PendingOrderLightPositiveColor}" Offset="0.44"/>
        <GradientStop ice:Freeze="True" Color="{StaticResource PendingOrderDarkPositiveColor}" Offset="0.44"/>
        <GradientStop ice:Freeze="True" Color="{StaticResource PendingOrderDarkPositiveColor}" Offset="0.6"/>
        <GradientStop ice:Freeze="True" Color="{StaticResource PendingOrderLightPositiveColor}" Offset="0.6"/>
        <GradientStop ice:Freeze="True" Color="{StaticResource PendingOrderLightPositiveColor}" Offset="1"/>
    </LinearGradientBrush>

Benefits of not freezing elements

The only benefit of having non-frozen brushes is that we can potentially change the theme at runtime. If we are not worried about the theme change, then we can get a good performance boost by freezing all of the brushes. Freezing elements is also pretty much the only way that we can support multi threaded windows with separate dispatchers.