父控件鼠标输入/离开带有子控件的事件

经过更多研究，我发现了Application.AddMessageFilter方法。使用此工具，我创建了.NET版本的鼠标钩：

class MouseMessageFilter : IMessageFilter, IDisposable{    public MouseMessageFilter()    {    }    public void Dispose()    {        StopFiltering();    }    #region IMessageFilter Members    public bool PreFilterMessage(ref Message m)    {         // Call the appropriate event         return false;    }    #endregion    #region Events    public class CancelMouseEventArgs : MouseEventArgs    {...}    public delegate void CancelMouseEventHandler(object source, CancelMouseEventArgs e);    public event CancelMouseEventHandler MouseMove;    public event CancelMouseEventHandler MouseDown;    public event CancelMouseEventHandler MouseUp;    public void StartFiltering()    {        StopFiltering();        Application.AddMessageFilter(this);    }    public void StopFiltering()    {        Application.RemoveMessageFilter(this);    }}

然后，我可以在容器控件中处理MouseMove事件，检查鼠标是否在父控件中，然后开始工作。（我还必须跟踪上一次鼠标移到父控件上，以便可以停止先前启动的父控件。）

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在表单类中，我创建并连接了过滤器：

public class MyForm : Form{   MouseMessageFilter msgFilter;   public MyForm()   {...       msgFilter = new MouseMessageFilter();       msgFilter.MouseDown += new MouseMessageFilter.CancelMouseEventHandler(msgFilter_MouseDown);       msgFilter.MouseMove += new MouseMessageFilter.CancelMouseEventHandler(msgFilter_MouseMove);    }    private void msgFilter_MouseMove(object source, MouseMessageFilter.CancelMouseEventArgs e)    {        if (CheckSomething(e.Control) e.Cancel = true;    }   }