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28 lines
1.6 KiB
Markdown
28 lines
1.6 KiB
Markdown
---
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title: "How to: Determine Whether a Freezable Is Frozen"
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ms.date: "03/30/2017"
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "Freezable objects [WPF], determining if frozen"
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ms.assetid: 92e58baa-ee12-4a9e-ac3a-ca458807a8b2
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---
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# How to: Determine Whether a Freezable Is Frozen
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This example shows how to determine whether a <xref:System.Windows.Freezable> object is frozen. If you try to modify a frozen <xref:System.Windows.Freezable> object, it throws an <xref:System.InvalidOperationException>. To avoid throwing this exception, use the <xref:System.Windows.Freezable.IsFrozen%2A> property of the <xref:System.Windows.Freezable> object to determine whether it is frozen.
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## Example
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The following example freezes a <xref:System.Windows.Media.SolidColorBrush> and then tests it by using the <xref:System.Windows.Freezable.IsFrozen%2A> property to determine whether it is frozen.
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[!code-csharp[freezablesample_procedural#CheckIsFrozenExample](~/samples/snippets/csharp/VS_Snippets_Wpf/freezablesample_procedural/CSharp/freezablesample.cs#checkisfrozenexample)]
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[!code-vb[freezablesample_procedural#CheckIsFrozenExample](~/samples/snippets/visualbasic/VS_Snippets_Wpf/freezablesample_procedural/visualbasic/freezablesample.vb#checkisfrozenexample)]
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For more information about <xref:System.Windows.Freezable> objects, see the [Freezable Objects Overview](freezable-objects-overview.md).
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## See also
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- <xref:System.Windows.Freezable>
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- <xref:System.Windows.Freezable.IsFrozen%2A>
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- [Freezable Objects Overview](freezable-objects-overview.md)
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- [How-to Topics](base-elements-how-to-topics.md)
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