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26 lines
1.9 KiB
Markdown
26 lines
1.9 KiB
Markdown
---
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title: "How to: Create and Use a GridLengthConverter Object"
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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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- "Grid control [WPF], creating [WPF], GridLengthConverter objects"
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ms.assetid: 5ab75911-e36a-4825-80e4-081c57e8e182
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---
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# How to: Create and Use a GridLengthConverter Object
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## Example
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The following example shows how to create and use an instance of <xref:System.Windows.GridLengthConverter>. The example defines a custom method called `changeCol`, which passes the <xref:System.Windows.Controls.ListBoxItem> to a <xref:System.Windows.GridLengthConverter> that converts the <xref:System.Windows.Controls.ContentControl.Content%2A> of a <xref:System.Windows.Controls.ListBoxItem> to an instance of <xref:System.Windows.GridLength>. The converted value is then passed back as the value of the <xref:System.Windows.Controls.ColumnDefinition.Width%2A> property of the <xref:System.Windows.Controls.ColumnDefinition> element.
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The example also defines a second custom method, called `changeColVal`. This custom method converts the <xref:System.Windows.Controls.Primitives.RangeBase.Value%2A> of a <xref:System.Windows.Controls.Slider> to a <xref:System.String> and then passes that value back to the <xref:System.Windows.Controls.ColumnDefinition> as the <xref:System.Windows.Controls.ColumnDefinition.Width%2A> of the element.
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Note that a separate Extensible Application Markup Language (XAML) file defines the contents of a <xref:System.Windows.Controls.ListBoxItem>.
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[!code-csharp[gridlengthConverterGrid#1](~/samples/snippets/csharp/VS_Snippets_Wpf/gridlengthConverterGrid/CSharp/Window1.xaml.cs#1)]
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[!code-vb[gridlengthConverterGrid#1](~/samples/snippets/visualbasic/VS_Snippets_Wpf/gridlengthConverterGrid/VisualBasic/Window1.xaml.vb#1)]
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## See also
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- <xref:System.Windows.GridLengthConverter>
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- <xref:System.Windows.GridLength>
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