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45 lines
2.7 KiB
Markdown
45 lines
2.7 KiB
Markdown
---
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title: "PresentationOptions:Freeze Attribute"
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ms.date: "03/30/2017"
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ms.custom: devdivchpfy22
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description: Learn about the Freeze attribute.
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helpviewer_keywords:
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- "Freeze attribute [WPF]"
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- "Freezable elements [WPF]"
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- "PresentationOptions prefix [WPF]"
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ms.assetid: 391032dd-2fba-4804-bb8a-3b071797a9f4
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---
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# PresentationOptions:Freeze Attribute
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Sets the <xref:System.Windows.Freezable.IsFrozen%2A> state to `true` on the containing <xref:System.Windows.Freezable> element. Default behavior for a <xref:System.Windows.Freezable> without the `PresentationOptions:Freeze` attribute specified is that <xref:System.Windows.Freezable.IsFrozen%2A> is `false` at load time, and dependent on general <xref:System.Windows.Freezable> behavior at runtime.
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## XAML Attribute Usage
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```xaml
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<object
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xmlns:PresentationOptions="http://schemas.microsoft.com/winfx/2006/xaml/presentation/options"
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xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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mc:Ignorable="PresentationOptions">
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<freezableElement PresentationOptions:Freeze="true"/>
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</object>
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```
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## XAML Values
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| Value| Description|
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|------|------------|
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|`PresentationOptions`|An XML namespace prefix, which can be any valid prefix string, per the XML 1.0 specification. The prefix `PresentationOptions` is used for identification purposes in this documentation.|
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|`freezableElement`|An element that instantiates any derived class of <xref:System.Windows.Freezable>.|
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## Remarks
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The `Freeze` attribute is the only attribute or other programming element defined in the `http://schemas.microsoft.com/winfx/2006/xaml/presentation/options` XML namespace. The `Freeze` attribute exists in this special namespace specifically so that it can be designated as ignorable, using [mc:Ignorable Attribute](mc-ignorable-attribute.md) as part of the root element declarations. The reason that `Freeze` must be able to be ignorable is because not all XAML processor implementations are able to freeze a <xref:System.Windows.Freezable> at load time; this capability is not part of the XAML specification.
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The ability to process the `Freeze` attribute is specifically built in to the WPF XAML processor when processing the `Freeze` attribute on <xref:System.Windows.Freezable> elements at load time.
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Any value for the `Freeze` attribute other than `true` (not case sensitive) generates a load time error. (Specifying the `Freeze` attribute as `false` is not an error, but that is already the default, so setting to `false` does nothing).
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## See also
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- <xref:System.Windows.Freezable>
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- [Freezable Objects Overview](freezable-objects-overview.md)
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- [mc:Ignorable Attribute](mc-ignorable-attribute.md)
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