09-Delete directory and file operations

Basic knowledge of file operations:

Directory //Operations Directories (folders), static classes. DirectoryInfo//folder of a "class", instance class. Used to describe a folder object that returns a DirectoryInfo array when all directories under the specified directory are obtained. Returns the folder array)FileInfo//File class, instance class. Used to describe a file object. Returns an FileInfo array when all the files in the specified directory are obtained.

Example: Delete files in all folders and folders under F:\a:

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.IO;namespace_06 Delete Folder Action {classProgram {Static voidMain (string[] args) {            //============== Delete files in all folders and folders under F:\a ===========            #region1. The most direct approachstring[] Demodirs = Directory.getdirectories (@"f:\a");//get all folders in this directory            string[] Demofiles = Directory.GetFiles (@"f:\a");//get all the files in this directory//Delete Folder Action            if(Demodirs.length >0)            {                foreach(varIteminchdemodirs) {Directory.delete (item,true);//True indicates that a subfolder is not empty when it is also deleted                }            }            //Delete file Operation            if(Demofiles.length >0)            {                foreach(varIteminchdemofiles)                {File.delete (item); }            }             #endregion        }    }}

Suppose Directory.delete (item, TRUE), cannot use true.

Idea: Using recursive method, first delete the file under each directory, and then delete the folder, the code is as follows:

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.IO;namespace_06 Delete Folder Action {classProgram {Static voidMain (string[] args) {            //============== Delete files in all folders and folders under F:\a ===========//2. DirectoryInfo operation folder class, FileInfo operation File class, recursiveDirectoryInfo Dirinfo =NewDirectoryInfo (@"f:\a");            Deletedir (Dirinfo); Dirinfo.delete ();//Finally, delete the directory        }        Static voidDeletedir (DirectoryInfo dirinfo) {directoryinfo[] Dirinfos=dirinfo.getdirectories (); Fileinfo[] Fileinfos=Dirinfo.getfiles (); if(Fileinfos.length >0)            {                foreach(varFileinchFileinfos) {file. Delete ();//Delete files under this directory                }            }            if(Dirinfos.length >0)            {                foreach(varDirinchDirinfos) {Deletedir (dir);//recursively call this method to delete folders and files in this directoryDir. Delete ();//Delete this directory                }            }        }    }}

Summary of use of the Directory and DirectoryInfo methods:
1. Create a few directories: Directory.CreateDirectory (@ "c:\test\1");
2. Get all the immediate subdirectories under the current directory:
string[] dirs = directory.getdirectories (@ "C: \");
string[] dirs = directory.getdirectories (@ "C: \", "*i*", searchoption.topdirectoryonly); Wildcard to find subdirectories under the directory, you can search for hidden files.
3. Determine if a folder exists in a directory: BOOL Directory.Exists (PATH)
4. Delete the directory, recursive indicates whether to delete recursively, and if recursive is false, only empty directories can be deleted:
void Delete (string path, bool recursive)
5. to get a file under a directory:
String[] Directory.GetFiles (string path)

String[] Directory.GetFiles (string path, String searchpattern, SearchOption searchoption), wildcard find file under directory

6. Move ()//movement, cut. Only on the same disk. The directory does not have a copy method. You can use the move () method to implement renaming.

09-Delete directory and file operations