1 public static bool IsModal(this Window window)2 {3     return(bool)typeof(Window).GetField("_showingAsDialog", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(window);4 }

1 public static bool IsModal(this Window window)2 {3     var filedInfo=typeof(Window).GetField("_showingAsDialog", BindingFlags.Instance | BindingFlags.NonPublic);4 5     return filedInfo!=null&&(bool)filedInfo.GetValue(window);6 }