使用C#的WPF界面，编程读取XML文件，并利用TreeView控件进行显示，主要是为了演示如何用C#读Xml文件以及TreeView控件的使用方法-use WPF in C# and programme to read the XML file,and make use of the control of TreeView to show the content of XML file.This Demo is mainly to demostrate how to read XML file