检查控件是否有 Click EventHandler 上的事件

我想知道控件是否有为 Click 事件分配的方法。

Button b = new Button();
b.Click += (sender, e) => { };

/* What I want */
b.Click.Count // 1

我需要一些东西至少可以告诉我控件是否有关于单击事件的某种方法。

我已经检查了建议的主题Norman H (确定绑定到事件的事件处理程序列表)

它对我有用，以防“事件点击"

    hasClickEventHandler = HasEventHandler(buttonControl, "EventClick");
    Assert.AreEqual(hasClickEventHandler, true);


    private bool HasEventHandler(Control control, string eventName)
    {
        EventHandlerList events =
            (EventHandlerList)
            typeof(Component)
             .GetProperty("Events", BindingFlags.NonPublic | BindingFlags.Instance)
             .GetValue(control, null);

        object key = typeof(Control)
            .GetField(eventName, BindingFlags.NonPublic | BindingFlags.Static)
            .GetValue(null);

        Delegate handlers = events[key];

        return handlers != null && handlers.GetInvocationList().Any();
    }

可能的值事件名称在这个的输出中获取字段命令：

typeof(Control).GetFields(BindingFlags.NonPublic | BindingFlags.Static)

所以可能的值：

...
[6]: {System.Object EventAutoSizeChanged}
[7]: {System.Object EventKeyDown}
[8]: {System.Object EventKeyPress}
[9]: {System.Object EventKeyUp}
[10]: {System.Object EventMouseDown}
[11]: {System.Object EventMouseEnter}
[12]: {System.Object EventMouseLeave}
[13]: {System.Object EventMouseHover}
[14]: {System.Object EventMouseMove}
[15]: {System.Object EventMouseUp}
[16]: {System.Object EventMouseWheel}
[17]: {System.Object EventClick}
[18]: {System.Object EventClientSize}
[19]: {System.Object EventDoubleClick}
[20]: {System.Object EventMouseClick}
[21]: {System.Object EventMouseDoubleClick}
[22]: {System.Object EventMouseCaptureChanged}
[23]: {System.Object EventMove}
[24]: {System.Object EventResize}
[25]: {System.Object EventLayout}
[26]: {System.Object EventGotFocus}
[27]: {System.Object EventLostFocus}
[28]: {System.Object EventEnabledChanged}
[29]: {System.Object EventEnter}
[30]: {System.Object EventLeave}
[31]: {System.Object EventHandleCreated}
[32]: {System.Object EventHandleDestroyed}
[33]: {System.Object EventVisibleChanged}
[34]: {System.Object EventControlAdded}
[35]: {System.Object EventControlRemoved}
[36]: {System.Object EventChangeUICues}
[37]: {System.Object EventSystemColorsChanged}
[38]: {System.Object EventValidating}
[39]: {System.Object EventValidated}
[40]: {System.Object EventStyleChanged}
[41]: {System.Object EventImeModeChanged}
[42]: {System.Object EventHelpRequested}
[43]: {System.Object EventPaint}
[44]: {System.Object EventInvalidated}
[45]: {System.Object EventQueryContinueDrag}
[46]: {System.Object EventGiveFeedback}
[47]: {System.Object EventDragEnter}
[48]: {System.Object EventDragLeave}
[49]: {System.Object EventDragOver}
[50]: {System.Object EventDragDrop}
[51]: {System.Object EventQueryAccessibilityHelp}
[52]: {System.Object EventBackgroundImage}
[53]: {System.Object EventBackgroundImageLayout}
[54]: {System.Object EventBindingContext}
[55]: {System.Object EventBackColor}
[56]: {System.Object EventParent}
[57]: {System.Object EventVisible}
[58]: {System.Object EventText}
[59]: {System.Object EventTabStop}
[60]: {System.Object EventTabIndex}
[61]: {System.Object EventSize}
[62]: {System.Object EventRightToLeft}
[63]: {System.Object EventLocation}
[64]: {System.Object EventForeColor}
[65]: {System.Object EventFont}
[66]: {System.Object EventEnabled}
[67]: {System.Object EventDock}
[68]: {System.Object EventCursor}
[69]: {System.Object EventContextMenu}
[70]: {System.Object EventContextMenuStrip}
[71]: {System.Object EventCausesValidation}
[72]: {System.Object EventRegionChanged}
[73]: {System.Object EventMarginChanged}
[74]: {System.Object EventPaddingChanged}
[75]: {System.Object EventPreviewKeyDown}