C#如何获取当前路径的父路径

 System.IO.DirectoryInfo topDir = System.IO.Directory.GetParent(System.Environment.CurrentDirectory);
//D:\项目\测试\test\bin\Debug

string pathto = topDir.Parent.Parent.FullName;//D:\项目\测试\test

string fileName = Path.GetFileNameWithoutExtension("E:\dyl190909\Demo\CulculateTest\Culculate\View.cs");
//fileName结果为Culculate

//获取模块的完整路径。
string path1 = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName;
//获取和设置当前目录(该进程从中启动的目录)的完全限定目录
string path2 = System.Environment.CurrentDirectory;
//获取应用程序的当前工作目录
string path3 = System.IO.Directory.GetCurrentDirectory();
//获取程序的基目录
string path4 = System.AppDomain.CurrentDomain.BaseDirectory;
//获取和设置包括该应用程序的目录的名称
string path5 = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
//获取启动了应用程序的可执行文件的路径
string path6 = System.Windows.Forms.Application.StartupPath;
//获取启动了应用程序的可执行文件的路径及文件名
string path7 = System.Windows.Forms.Application.ExecutablePath;
StringBuilder str=new StringBuilder();
str.AppendLine("System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName:" + path1);
str.AppendLine("System.Environment.CurrentDirectory:" + path2);
str.AppendLine("System.IO.Directory.GetCurrentDirectory():" + path3);
str.AppendLine("System.AppDomain.CurrentDomain.BaseDirectory:" + path4);
str.AppendLine("System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase:" + path5);
str.AppendLine("System.Windows.Forms.Application.StartupPath:" + path6);
str.AppendLine("System.Windows.Forms.Application.ExecutablePath:" + path7);
string allPath = str.ToString();