File FileInfo
1. File
File.Exists(path)
File.Delete(path)
File.Create(path)
File.Move(path1,path2)
File.Copy(path1,path2,true)
2. FileInfo
FileInfo fileInfo = new FileInfo(path)
.CreationTime
.Extension(例如:.txt)
.FullName(例如:C:\1.txt)
.name(例如:1.txt)