我正在尝试为我的动画创建一个暂停按钮（所以OnRendering停止射击）但它似乎没有停止。我以为用这个 CompositionTarget.Rendering - =（s，g）=＆gt; OnRendering（s，g，time）;意味着它会阻止事件发射，但似乎没有起作用。谢谢你的帮助！
我的代码：
private void btn_Pause_Click(object sender, RoutedEventArgs e)
{
time = DateTime.Now;
if ((string)btn_Pause.Content == "Pause")
{
btn_Pause.Content = "Resume";
CompositionTarget.Rendering -= (s, g) => OnRendering(s, g, time);
}
else
{
CompositionTarget.Rendering += (s, g) => OnRendering(s, g, time);
btn_Pause.Content = "Pause";
}
}
private void OnRendering(object sender, EventArgs g, DateTime t)
{
var now = DateTime.Now;
var dt = (now - t).TotalSeconds;
time = now;
position += Velocity * dt;
Velocity += acceleration * dt;
projectileGeometry.Center = position;
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
position = new Point(5, 290);
Velocity = new Vector(50, -70); // y direction is downwards
acceleration = new Vector(0, 30); // y direction is downwards
time = DateTime.Now;
CompositionTarget.Rendering += (s, g) => OnRendering(s, g, time);
}
我尝试过使用CompositionTarget.Rendering - = OnRendering;但是我在“OnRending”匹配委托“System.EventHandler”时遇到No overload错误。
如果删除了DateTime T并将其作为参数传入，我如何控制暂停和恢复按钮以及后退和前进按钮？
private void btn_Pause_Click(object sender, RoutedEventArgs e)
{
EventHandler Handler = (s, g) => OnRendering(s, g, time);
time = DateTime.Now;
if ((string)btn_Pause.Content == "Pause")
{
btn_Pause.Content = "Resume";
CompositionTarget.Rendering -= Handler;
}
else
{
CompositionTarget.Rendering += Handler;
btn_Pause.Content = "Pause";
}
}
试过这根本不会停止动画。