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ListBoxField Class

This article describes the following topics:


This class corresponds to FormFieldType.ListBox enum value and represents a list with choices that may be selected.


ListBoxField provides the following properties:

  • Value: Gets or sets an array of selected choices. Each choice is represented by the ChoiceOption class that has a single Value and UserInterfaceValue properties. The UserInterfaceValue property is optional and, when null, the Value property is used to display the choice in the user interface.

  • DefaultValue: Gets or sets the default selected choices, used when the AcroForm is reset to its default values.

  • Widgets: A collection of Widget annotations, which represent the field on the PDF pages. The widgets are created by using the collection AddWidget() method and can be removed by using the collection's Remove() method. As the widget collection implements the IEnumerable interface, the available widget instances can be iterated.

  • Options: A ChoiceOptionCollection instance containing all available choices for this field. In order to modify this collection, you can use its indexer property and its Add(), RemoveAt() and Clear() methods. Each ChoiceOption instance can be added only once to such a collection. If you try adding the same instance more than once in the collection, an exception will be thrown.

  • ShouldCommitOnSelectionChange: Boolean value indicating whether to commit the selected value on selection change.

  • TopIndex: Gets or sets integer value providing the index of the choice that should be visualized on top of the list box viewport rectangle.

Example 1: Create a ListBoxField and add it to a page

ListBoxField listBoxField = new ListBoxField("SampleListBox"); 
listBoxField.Options.Add(new ChoiceOption("First Value")); 
listBoxField.Options.Add(new ChoiceOption("Second Value")); 
listBoxField.Options.Add(new ChoiceOption("Third Value")); 
listBoxField.Value = new ChoiceOption[] { listBoxField.Options[1] }; 
VariableContentWidget widget = listBoxField.Widgets.AddWidget(); 
widget.Rect = new Rect(100, 100, 200, 200); 

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