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Co-authored-by: Andy De George <[email protected]>
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David Coulter
2020-11-05 13:50:29 -08:00
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co-authored by Andy De George
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dotnet-desktop-guide/framework/wpf/data/how-to-implement-prioritybinding.md
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ms.assetid: d63b65ab-b3e9-4322-9aa8-1450f8d89532
---
# How to: Implement PriorityBinding
<xref:System.Windows.Data.PriorityBinding> in [!INCLUDE[TLA#tla_winclient](../../../includes/tlasharptla-winclient-md.md)] works by specifying a list of bindings. The list of bindings is ordered from highest priority to lowest priority. If the highest priority binding returns a value successfully when it is processed then there is never a need to process the other bindings in the list. It could be the case that the highest priority binding takes a long time to be evaluated, the next highest priority that returns a value successfully will be used until a binding of a higher priority returns a value successfully.
## Example
To demonstrate how <xref:System.Windows.Data.PriorityBinding> works, the `AsyncDataSource` object has been created with the following three properties: `FastDP`, `SlowerDP`, and `SlowestDP`.
The get accessor of `FastDP` returns the value of the `_fastDP` data member.
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The get accessor of `SlowestDP` waits for 5 seconds before returning the value of the `_slowestDP` data member.
> [!NOTE]
> This example is for demonstration purposes only. The .NET guidelines recommend against defining properties that are orders of magnitude slower than a field set would be. For more information, see [Choosing Between Properties and Methods](https://docs.microsoft.com/previous-versions/dotnet/netframework-4.0/ms229054(v=vs.100)).
> This example is for demonstration purposes only. The .NET guidelines recommend against defining properties that are orders of magnitude slower than a field set would be. For more information, see [Choosing Between Properties and Methods](/previous-versions/dotnet/netframework-4.0/ms229054(v=vs.100)).
[!code-csharp[PriorityBinding#1](~/samples/snippets/csharp/VS_Snippets_Wpf/PriorityBinding/CSharp/Window1.xaml.cs#1)]
[!code-vb[PriorityBinding#1](~/samples/snippets/visualbasic/VS_Snippets_Wpf/PriorityBinding/VisualBasic/AsyncDataSource.vb#1)]