https://msdn.microsoft.com/zh-cn/library/system.windows.controls.control(v=vs.110).aspx
https://msdn.microsoft.com/zh-cn/library/system.windows.controls.canvas(v=vs.110).aspx
system.windows.controls
至少证明我们还活着
https://msdn.microsoft.com/zh-cn/library/system.windows.controls.control(v=vs.110).aspx
https://msdn.microsoft.com/zh-cn/library/system.windows.controls.canvas(v=vs.110).aspx