Find a UI Automation Element for a List Item
.NET Framework 3.0
This topic shows how to retrieve an AutomationElement for an item within a list when the index of the item is known.
Example
The following example shows two ways of retrieving a specified item from a list, one using TreeWalker and the other using FindAll.
The first technique tends to be faster for Win32 controls, but the second is faster for Windows Presentation Foundation (WPF) controls.
/// <summary> /// Retrieves an element in a list, using TreeWalker. /// </summary> /// <param name="parent">The list element.</param> /// <param name="index">The index of the element to find.</param> /// <returns>The list item.</returns> AutomationElement FindChildAt(AutomationElement parent, int index) { if (index < 0) { throw new ArgumentOutOfRangeException(); } TreeWalker walker = TreeWalker.ControlViewWalker; AutomationElement child = walker.GetFirstChild(parent); for (int x = 1; x <= index; x++) { child = walker.GetNextSibling(child); if (child == null) { throw new ArgumentOutOfRangeException(); } } return child; } /// <summary> /// Retrieves an element in a list, using FindAll. /// </summary> /// <param name="parent">The list element.</param> /// <param name="index">The index of the element to find.</param> /// <returns>The list item.</returns> AutomationElement FindChildAtB(AutomationElement parent, int index) { Condition findCondition = new PropertyCondition(AutomationElement.IsControlElementProperty, true); AutomationElementCollection found = parent.FindAll(TreeScope.Children, findCondition); if ((index < 0) || (index >= found.Count)) { throw new ArgumentOutOfRangeException(); } return found[index]; }
