wpf 后退父目录

string rootPath = "";
string BaseDirectoryPath = AppDomain.CurrentDomain.BaseDirectory;
rootPath = BaseDirectoryPath.Substring(0, BaseDirectoryPath.LastIndexOf("\"));
rootPath = rootPath.Substring(0, rootPath.LastIndexOf("\"));
rootPath = rootPath.Substring(0, rootPath.LastIndexOf("\"));
string path = rootPath + @"..ResourceEchartsechart.html";

or   this method
string url = AppDomain.CurrentDomain.BaseDirectory + @"....ResourceEchartsechart.html";
Web.Navigate(url);