截取文件路径问题.......

Question

           private void SetSolution()            
           {
              Solution2 solution = (Solution2)m_dte.Solution;
              string solutionName = solution.FullName;
              DirectoryInfo dir = new  DirectoryInfo(solutionName.IndexOf(??));
           }
在这个方法中我想截取solution的路径，应该在？？中怎么写呢？
小弟这里先谢了！

Answer 1

修改
DirectoryInfo dir = new  DirectoryInfo(solutionName.LastIndexOf(？？));

Answer 2

 DirectoryInfo dir = new  DirectoryInfo(""); 
        DirectoryInfo solution=dir.Parent;

Answer 3

new DirectoryInfo(Path.GetDirectoryName(solutionName))

Answer 4

DirectoryInfo dir = new  DirectoryInfo(solutionName.SubString(0,solutionName.LastIndexOf("\\")));