Click a button programmatically

ButtonAutomationPeer bap = new ButtonAutomationPeer(myButton);
IInvokeProvider iip = bap.GetPattern(PatternInterface.Invoke) as IInvokeProvider;
iip.Invoke(); // This clicks the Button

ButtonAutomationPeer在namespace using System.Windows.Automation.Peers;中
IInvokeProvider须添加引用UIAutomationProvider.dll，并添加namespace using System.Windows.Automation.Provider;
此代码在自动化测试时很有用。

附System.Windows.Automation.Peers下所有类：

namespace System.Windows.Automation.Peers
{
 
    public class ButtonAutomationPeer : ButtonBaseAutomationPeer, IInvokeProvider
 
    public abstract class ButtonBaseAutomationPeer : FrameworkElementAutomationPeer
 
    public class CheckBoxAutomationPeer : ToggleButtonAutomationPeer
 
    public class ComboBoxAutomationPeer : SelectorAutomationPeer, IValueProvider, IExpandCollapseProvider
 
    public abstract class ContentTextAutomationPeer : FrameworkContentElementAutomationPeer
 
    public class ContextMenuAutomationPeer : FrameworkElementAutomationPeer
 
    public class DocumentAutomationPeer : ContentTextAutomationPeer
 
    public class DocumentPageViewAutomationPeer : FrameworkElementAutomationPeer
 
    public class DocumentViewerAutomationPeer : DocumentViewerBaseAutomationPeer
 
    public class DocumentViewerBaseAutomationPeer : FrameworkElementAutomationPeer
 
    public class ExpanderAutomationPeer : FrameworkElementAutomationPeer, IExpandCollapseProvider
 
    public class FixedPageAutomationPeer : FrameworkElementAutomationPeer
 
    public class FlowDocumentPageViewerAutomationPeer : DocumentViewerBaseAutomationPeer
 
    public class FlowDocumentReaderAutomationPeer : FrameworkElementAutomationPeer, IMultipleViewProvider
 
    public class FlowDocumentScrollViewerAutomationPeer : FrameworkElementAutomationPeer
 
    public class FrameAutomationPeer : FrameworkElementAutomationPeer
 
    public class FrameworkContentElementAutomationPeer : ContentElementAutomationPeer
 
    public class FrameworkElementAutomationPeer : UIElementAutomationPeer
 
    public class GridSplitterAutomationPeer : ThumbAutomationPeer, ITransformProvider
 
    public class GridViewAutomationPeer : IViewAutomationPeer, ITableProvider, IGridProvider
 
    public class GridViewCellAutomationPeer : FrameworkElementAutomationPeer, ITableItemProvider, IGridItemProvider
 
    public class GridViewColumnHeaderAutomationPeer : FrameworkElementAutomationPeer, IInvokeProvider, ITransformProvider
 
    public class GridViewHeaderRowPresenterAutomationPeer : FrameworkElementAutomationPeer
 
    public class GridViewItemAutomationPeer : ListBoxItemAutomationPeer
 
    public class GroupBoxAutomationPeer : FrameworkElementAutomationPeer
 
    public class GroupItemAutomationPeer : FrameworkElementAutomationPeer
 
    internal class HwndHostAutomationPeer : FrameworkElementAutomationPeer
 
    public class HyperlinkAutomationPeer : TextElementAutomationPeer, IInvokeProvider
 
    public class ImageAutomationPeer : FrameworkElementAutomationPeer
 
    public class InkCanvasAutomationPeer : FrameworkElementAutomationPeer
 
    public class InkPresenterAutomationPeer : FrameworkElementAutomationPeer
 
    public abstract class ItemAutomationPeer : AutomationPeer
 
    [DefaultMember("Item")]
    internal class ItemPeersStorage
 
    public abstract class ItemsControlAutomationPeer : FrameworkElementAutomationPeer
 
    public interface IViewAutomationPeer
 
    public class LabelAutomationPeer : FrameworkElementAutomationPeer
 
    public class ListBoxAutomationPeer : SelectorAutomationPeer
 
    public class ListBoxItemAutomationPeer : SelectorItemAutomationPeer, IScrollItemProvider
 
    public class ListBoxItemWrapperAutomationPeer : FrameworkElementAutomationPeer
 
    public class ListViewAutomationPeer : ListBoxAutomationPeer
 
    public class MediaElementAutomationPeer : FrameworkElementAutomationPeer
 
    public class MenuAutomationPeer : FrameworkElementAutomationPeer
 
    public class MenuItemAutomationPeer : FrameworkElementAutomationPeer, IExpandCollapseProvider, IInvokeProvider, IToggleProvider
 
    public class NavigationWindowAutomationPeer : WindowAutomationPeer
 
    public class PasswordBoxAutomationPeer : FrameworkElementAutomationPeer, IValueProvider
 
    internal class PopupRootAutomationPeer : FrameworkElementAutomationPeer
 
    public class ProgressBarAutomationPeer : RangeBaseAutomationPeer, IRangeValueProvider
 
    public class RadioButtonAutomationPeer : ToggleButtonAutomationPeer, ISelectionItemProvider
 
    public class RangeBaseAutomationPeer : FrameworkElementAutomationPeer, IRangeValueProvider
 
    public class RepeatButtonAutomationPeer : ButtonBaseAutomationPeer, IInvokeProvider
 
    public class RichTextBoxAutomationPeer : TextAutomationPeer
 
    internal class RootBrowserWindowAutomationPeer : WindowAutomationPeer
 
    public class ScrollBarAutomationPeer : RangeBaseAutomationPeer
 
    public class ScrollViewerAutomationPeer : FrameworkElementAutomationPeer, IScrollProvider
 
    public abstract class SelectorAutomationPeer : ItemsControlAutomationPeer, ISelectionProvider
 
    public abstract class SelectorItemAutomationPeer : ItemAutomationPeer, ISelectionItemProvider
 
    public class SeparatorAutomationPeer : FrameworkElementAutomationPeer
 
    public class SliderAutomationPeer : RangeBaseAutomationPeer
 
    public class StatusBarAutomationPeer : FrameworkElementAutomationPeer
 
    public class StatusBarItemAutomationPeer : FrameworkElementAutomationPeer
 
    public class TabControlAutomationPeer : SelectorAutomationPeer, ISelectionProvider
 
    public class TabItemAutomationPeer : SelectorItemAutomationPeer, ISelectionItemProvider
 
    public class TabItemWrapperAutomationPeer : FrameworkElementAutomationPeer
 
    public class TableAutomationPeer : TextElementAutomationPeer, IGridProvider
 
    public class TableCellAutomationPeer : TextElementAutomationPeer, IGridItemProvider
 
    public abstract class TextAutomationPeer : FrameworkElementAutomationPeer
 
    public class TextBlockAutomationPeer : FrameworkElementAutomationPeer
 
    public class TextBoxAutomationPeer : TextAutomationPeer, IValueProvider
 
    public class TextElementAutomationPeer : ContentTextAutomationPeer
 
    public class ThumbAutomationPeer : FrameworkElementAutomationPeer
 
    public class ToggleButtonAutomationPeer : ButtonBaseAutomationPeer, IToggleProvider
 
    public class ToolBarAutomationPeer : FrameworkElementAutomationPeer
 
    public class ToolTipAutomationPeer : FrameworkElementAutomationPeer
 
    public class TreeViewAutomationPeer : FrameworkElementAutomationPeer, ISelectionProvider
 
    public class TreeViewItemAutomationPeer : FrameworkElementAutomationPeer, IExpandCollapseProvider, ISelectionItemProvider, IScrollItemProvider
 
    public class UserControlAutomationPeer : FrameworkElementAutomationPeer
 
    public class Viewport3DAutomationPeer : FrameworkElementAutomationPeer
 
    public class WindowAutomationPeer : FrameworkElementAutomationPeer
}