ColumnDefinition.Width Property

Gets the calculated width of a ColumnDefinition element, or sets the GridLength value of a column that is defined by the ColumnDefinition.

Namespace:  System.Windows.Controls
Assembly:  PresentationFramework (in PresentationFramework.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public GridLength Width { get; set; }
<object Width="GridLength" .../>

Property Value

Type: System.Windows.GridLength
The GridLength that represents the width of the Column. The default value is 1.0.

Identifier field

WidthProperty

Metadata properties set to true

None

The default GridUnitType is Star.

When you add or remove rows or columns, the ActualWidth for all ColumnDefinition elements and the ActualHeight of all RowDefinition elements becomes zero until Measure is called.

The following example shows how to create and use an instance of GridLengthConverter. The example defines a custom method called changeCol, which passes the ListBoxItem to a GridLengthConverter that converts the Content of a ListBoxItem to an instance of GridLength. The converted value is then passed back as the value of the Width property of the ColumnDefinition element.

The example also defines a second custom method, called changeColVal. This custom method converts the Value of a Slider to a String and then passes that value back to the ColumnDefinition as the Width of the element.

Note that a separate Extensible Application Markup Language (XAML) file defines the contents of a ListBoxItem.


        private void changeColVal(object sender, RoutedEventArgs e) 
		{
            txt1.Text = "Current Grid Column is " + hs1.Value.ToString();
        }

        private void changeCol(object sender, SelectionChangedEventArgs args)
        {
            ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
            GridLengthConverter myGridLengthConverter = new GridLengthConverter();
            if (hs1.Value == 0)
            {
                GridLength gl1 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
                col1.Width = gl1;
            }
            else if (hs1.Value == 1)
            {
                GridLength gl2 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
                col2.Width = gl2;
            }
            else if (hs1.Value == 2)
            {
                GridLength gl3 = (GridLength)myGridLengthConverter.ConvertFromString(li.Content.ToString());
                col3.Width = gl3;
            }
        }


.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
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