//1.获取模块的完整路径。 
string path1 = System.Diagnostics.Process.GetCurrentProcess().MainModule.FileName;

//2.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;

//3.获取应用程序的当前工作目录 
string path3 = System.IO.Directory.GetCurrentDirectory();

//4.获取程序的基目录 
string path4 = System.AppDomain.CurrentDomain.BaseDirectory;

//5.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;

//6.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;

//7.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; 

// 输出结果 
1. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release\XmlAndXsd.vshost.exe 
2. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release 
3. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release 
4. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release\ 
5. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release\ 
6. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release 
7. D:\work\prj\VP-VPlatform\XmlAndXsd\bin\Release\XmlAndXsd.EXE