GridItemPattern.GridItemPatternInformation.Column Property

Gets the ordinal number of the column that contains the cell or item.

Namespace: System.Windows.Automation
Assembly: UIAutomationClient (in uiautomationclient.dll)
XML Namespace:  http://schemas.microsoft.com/winfx/2006/xaml/presentation

public int Column { get; }
/** @property */
public int get_Column ()

public function get Column () : int

Not applicable.

Property Value

A zero-based ordinal number that identifies the column containing the cell or item. The default value is 0.

In the following example, an AutomationFocusChangedEvent listener is declared to track the traversal of grid items within a grid container. Item properties are echoed to the console upon each focus-changed event.

    ///--------------------------------------------------------------------
    /// <summary>
    /// Obtains a GridItemPattern control pattern from an 
    /// automation element.
    /// </summary>
    /// <param name="targetControl">
    /// The automation element of interest.
    /// </param>
    /// <returns>
    /// A GridItemPattern object.
    /// </returns>
    ///--------------------------------------------------------------------
    private GridItemPattern GetGridItemPattern(
        AutomationElement targetControl)
    {
        GridItemPattern gridItemPattern = null;

        try
        {
            gridItemPattern =
                targetControl.GetCurrentPattern(
                GridItemPattern.Pattern)
                as GridItemPattern;
        }
        // Object doesn't support the 
        // GridPattern control pattern
        catch (InvalidOperationException)
        {
            return null;
        }

        return gridItemPattern;
    }

...

    ///--------------------------------------------------------------------
    /// <summary>
    /// Obtains a GridPattern control pattern from an 
    /// automation element.
    /// </summary>
    /// <param name="targetControl">
    /// The automation element of interest.
    /// </param>
    /// <returns>
    /// A GridPattern object.
    /// </returns>
    ///--------------------------------------------------------------------
    private GridPattern GetGridPattern(
        AutomationElement targetControl)
    {
        GridPattern gridPattern = null;

        try
        {
            gridPattern =
                targetControl.GetCurrentPattern(
                GridPattern.Pattern)
                as GridPattern;
        }
        // Object doesn't support the 
        // GridPattern control pattern
        catch (InvalidOperationException)
        {
            return null;
        }

        return gridPattern;
    }

...

    ///--------------------------------------------------------------------
    /// <summary>
    /// Set up grid item event listeners.
    /// </summary>
    /// <param name="targetControl">
    /// The grid item container of interest.
    /// </param>
    ///--------------------------------------------------------------------
    private void SetGridItemEventListeners(AutomationElement targetControl)
    {
        AutomationFocusChangedEventHandler gridItemFocusChangedListener =
            new AutomationFocusChangedEventHandler(OnGridItemFocusChange);
        Automation.AddAutomationFocusChangedEventHandler(
            gridItemFocusChangedListener);
    }

...

    ///--------------------------------------------------------------------
    /// <summary>
    /// Event handler for grid item focus change.
    /// Can be used to track traversal of individual grid items 
    /// within a grid.
    /// </summary>
    /// <param name="src">Object that raised the event.</param>
    /// <param name="e">Event arguments.</param>
    ///--------------------------------------------------------------------
    private void OnGridItemFocusChange(
        object src, AutomationFocusChangedEventArgs e)
    {
        // Make sure the element still exists. Elements such as tooltips
        // can disappear before the event is processed.
        AutomationElement sourceElement;
        try
        {
            sourceElement = src as AutomationElement;
        }
        catch (ElementNotAvailableException)
        {
            return;
        }

        // Gets a GridItemPattern from the source of the event.
        GridItemPattern gridItemPattern = 
            GetGridItemPattern(sourceElement);

        if (gridItemPattern == null)
        {
            return;
        }

        // Gets a GridPattern from the grid container.
        GridPattern gridPattern = 
            GetGridPattern(gridItemPattern.Current.ContainingGrid);

        if (gridPattern == null)
        {
            return;
        }

        AutomationElement gridItem = null;
        try
        {
            gridItem = gridPattern.GetItem(
            gridItemPattern.Current.Row, 
            gridItemPattern.Current.Column);
        }
        catch (ArgumentOutOfRangeException)
        {
            // If the requested row coordinate is larger than the RowCount 
            // or the column coordinate is larger than the ColumnCount.
            // -- OR --
            // If either of the requested row or column coordinates 
            // are less than zero.
            // TO DO: error handling.
        }

        // Further event processing can be done at this point.
        // For the purposes of this sample we just report item properties.
        StringBuilder gridItemReport = new StringBuilder();
        gridItemReport.AppendLine(
            gridItemPattern.Current.Row.ToString()).AppendLine(
            gridItemPattern.Current.Column.ToString()).AppendLine(
            gridItemPattern.Current.RowSpan.ToString()).AppendLine(
            gridItemPattern.Current.ColumnSpan.ToString()).AppendLine(
            gridItem.Current.AutomationId.ToString());
        Console.WriteLine(gridItemReport.ToString());
    }

    ///--------------------------------------------------------------------
    /// <summary>
    /// Handles our application shutdown.
    /// </summary>
    /// <param name="args">Event arguments.</param>
    ///--------------------------------------------------------------------
    protected override void OnExit(System.Windows.ExitEventArgs args)
    {
        Automation.RemoveAllEventHandlers();
        base.OnExit(args);
    }

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0

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