方法实现
public class DirectoryAllFiles
   {
       static List<FileInformation> FileList = new List<FileInformation>();
       public static List<FileInformation> GetAllFiles(DirectoryInfo dir)
       {
           FileInfo[] allFile = dir.GetFiles();
           foreach (FileInfo fi in allFile)
           {
               FileList.Add(new FileInformation{ FileName=fi.Name,FilePath=fi.FullName });
           }
           DirectoryInfo[] allDir= dir.GetDirectories();
           foreach (DirectoryInfo d in allDir)
           {
               GetAllFiles(d);
           }
           return FileList;
       }
   }

   public class FileInformation
   {
       public string FileName { get; set; }
       public string FilePath { get; set; }
   }
方法调用： List<FileInformation> list = DirectoryAllFiles.GetAllFiles(

new System.IO.DirectoryInfo(@"E:\Test"));  if (list.Where(t => t.FileName.ToLower().Contains("json")).Any()) Console.WriteLine("有信息");  foreach (var item in list)  

{

                  Console.WriteLine(

string.Format("文件名：{0}---文件目录{1}",item.FileName,item.FilePath));  

}