WPF判断当前窗体是否为模态

1、使用System.Windows.Interop.ComponentDispatcher.IsThreadModal来判断

参照：https://social.msdn.microsoft.com/Forums/vstudio/en-US/c95f1acb-5dee-4670-b779-b07b06afafff/where-is-modal-property?forum=wpf

注意事项：

参照：http://stackoverflow.com/questions/368926/how-do-i-determine-if-a-wpf-window-is-modal

1、Works not immediately after ShowModal is called. Some events still cannot tell if modal

2、This doesn‘t work if a modal dialog is showing this modeless dialog!

2、使用反射

eg:新建一个拓展方法

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

改进为：

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 }

参照：http://stackoverflow.com/questions/368926/how-do-i-determine-if-a-wpf-window-is-modal

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