C#关于委托事件中调用其他控件的问题...

Question

一共有3个控件, 1个是本来就有的, 另外2个是new出来的 具体是这样子: 

点击button1  就new一个grid和一个button2 , 然后把button2的visibility设置成Hidden添加到grid中 , 
给grid添加的鼠标经过事件 ,grid的事件是当鼠标经过这个grid的时候需要把button2的visibility设置成Visible

请问这个时候 怎么来调用button2呢 ? 

button2和grid都是在button1的点击事件中创建的, 在grid的事件里, 又没button2, 
可以用grid事件的委托传参数吗? 或者其他的办法? 

代码是这样子

private void button1_Click(object sender, RoutedEventArgs e)
{
    Grid grid = new Grid();
    Button button2 = new Button();

    button2.Visibility = Visibility.Hidden;

    grid.Children.Add(button2);

    grid.MouseEnter += new MouseEventHandler(grid_MouseEnter);
}

void grid_MouseEnter(object sender, MouseEventArgs e)
{
    //在这个地方改变button2的Visibility属性
}

Answer 1

针对你的问题，最简单的一个解决方法是使用

        void g_MouseMove(object sender, System.Windows.Input.MouseEventArgs e) {
            Grid g = sender as Grid;
            Button b = g.Children[0] as Button;
            b.Visibility = System.Windows.Visibility.Visible;
        }

当然，通常情况下这种方法太过特定，所以，更合适的方法是使用FrameworkElement.FindName方法，这个方法需要你在创建控件时，注册控件名称，代码如下：

        private void Add_Click(object sender, RoutedEventArgs e) {
            Grid g = new Grid();

            Button b = new Button();
            this.RegisterName("vb", b); // This is important!
            b.Content = "Hi";
            b.Visibility = System.Windows.Visibility.Hidden;

            g.Children.Add(b);
            g.Background = new SolidColorBrush(Color.FromRgb(0, 128, 128));
            g.MouseMove += new System.Windows.Input.MouseEventHandler(g_MouseMove);

            parent.Children.Add(g);
            Grid.SetRow(g, 0);
            Grid.SetColumn(g, 0);
        }

        void g_MouseMove(object sender, System.Windows.Input.MouseEventArgs e) {
            Grid g = sender as Grid;
            Button b = g.FindName("vb") as Button;
            b.Visibility = System.Windows.Visibility.Visible;
        }

---

Wanpeng [e-mail]

Answer 2

针对你的问题，最简单的一个解决方法是使用

        void g_MouseMove(object sender, System.Windows.Input.MouseEventArgs e) {
            Grid g = sender as Grid;
            Button b = g.Children[0] as Button;
            b.Visibility = System.Windows.Visibility.Visible;
        }

当然，通常情况下这种方法太过特定，所以，更合适的方法是使用FrameworkElement.FindName方法，这个方法需要你在创建控件时，注册控件名称，代码如下：

        private void Add_Click(object sender, RoutedEventArgs e) {
            Grid g = new Grid();

            Button b = new Button();
            this.RegisterName("vb", b); // This is important!
            b.Content = "Hi";
            b.Visibility = System.Windows.Visibility.Hidden;

            g.Children.Add(b);
            g.Background = new SolidColorBrush(Color.FromRgb(0, 128, 128));
            g.MouseMove += new System.Windows.Input.MouseEventHandler(g_MouseMove);

            parent.Children.Add(g);
            Grid.SetRow(g, 0);
            Grid.SetColumn(g, 0);
        }

        void g_MouseMove(object sender, System.Windows.Input.MouseEventArgs e) {
            Grid g = sender as Grid;
            Button b = g.FindName("vb") as Button;
            b.Visibility = System.Windows.Visibility.Visible;
        }

---

Wanpeng [e-mail]

非常感谢, 我用的方法太麻烦了, 原来还有这么实惠的办法~太感谢了!!