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How to: Create and Use a GridLengthConverter Object


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.

To view the complete sample, including the related XAML file, see Instantiating and Using a GridLengthConverter Object Sample.

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

public 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;

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