EditorWindow.SendEvent 发送事件

var win : EditorWindow;

/// Sends a paste event to an EditorWindow, as if Paste was selected from the Edit menu.
///如果从编辑器菜单选择了粘贴，发送一个粘贴事件到一个编辑器窗口。

win.SendEvent(EditorGUIUtility.CommandEvent("Paste"));