我们不会为您编写整个应用程序的代码.我们可能会给您一点帮助.
在网络上，您可能会发现许多(很多！)关于使用C#编写XML文件的教程，例如，参见 C#XmlWriter教程 [ ^ ].

We aren''t going to code the whole application for you. we might just give you a little help.
You may find, on the web, many many (many!) tutorials about writing XML files usign C#, see, for instance C# XmlWriter Tutorial[^].