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 + @"..\Resource\Echarts\echart.html";

or   this method
string url = AppDomain.CurrentDomain.BaseDirectory + @"..\..\Resource\Echarts\echart.html";
Web.Navigate(url);