C# common IO methods
public class IoHelper
{
/// <summary>
///Check whether the file exists
/// </summary>
/// <param name="fileName">The file path</param>
/// <returns>If there is a</returns>
public static bool Exists(string fileName)
{
if (fileName == null || fileName.Trim() == "")
{
return false;
}
return File.Exists(fileName);
}
/// <summary>
///Creating a folder
/// </summary>
/// <param name="dirName">Folder name</param>
/// <returns></returns>
public static bool CreateDir(string dirName)
{
try
{
if (dirName == null)
throw new Exception("dirName");
if(! Directory.Exists(dirName)) { Directory.CreateDirectory(dirName); }return true;
}
catch (Exception er)
{
throw newException(er.Message); }}/// <summary>
///Create a file
/// </summary>
/// <param name="fileName">The file name</param>
/// <returns>Return false on creation failure</returns>
public static bool CreateFile(string fileName)
{
try
{
if (File.Exists(fileName)) return false;
var fs = File.Create(fileName);
fs.Close();
fs.Dispose();
}
catch (IOException ioe)
{
throw new IOException(ioe.Message);
}
return true;
}
/// <summary>
///Read the content of the file and convert it to a character type
/// </summary>
/// <param name="fileName">The file path</param>
/// <returns></returns>
public static string Read(string fileName)
{
if(! Exists(fileName)) {return null;
}
// Read file information into the stream
using (var fs = new FileStream(fileName, FileMode.Open))
{
return newStreamReader(fs).ReadToEnd(); }}/// <summary>
///Files are converted to Char[] arrays
/// </summary>
/// <param name="fileName"></param>
/// <returns></returns>
public static char[] FileRead(string fileName)
{
if(! Exists(fileName)) {return null;
}
var byData = new byte[1024];
var charData = new char[1024];
try
{
var fileStream = new FileStream(fileName, FileMode.Open);
fileStream.Seek(135, SeekOrigin.Begin);
fileStream.Read(byData, 0.1024);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
var decoder = Encoding.UTF8.GetDecoder();
decoder.GetChars(byData, 0, byData.Length, charData, 0);
return charData;
}
/// <summary>
///File converted to byte[]
/// </summary>
/// <param name="fileName">The file path</param>
/// <returns></returns>
public static byte[] ReadFile(string fileName)
{
FileStream pFileStream = null;
try
{
pFileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read);
var r = new BinaryReader(pFileStream);
// Set the file pointer to file open
r.BaseStream.Seek(0, SeekOrigin.Begin);
var pReadByte = r.ReadBytes((int)r.BaseStream.Length);
return pReadByte;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if(pFileStream ! =null) pFileStream.Close(); }}/// <summary>
///Writes byte to a file
/// </summary>
/// <param name="pReadByte">Byte stream</param>
/// <param name="fileName">The file path</param>
/// <returns></returns>
public static bool WriteFile(byte[] pReadByte, string fileName)
{
FileStream pFileStream = null;
try
{
pFileStream = new FileStream(fileName, FileMode.OpenOrCreate);
pFileStream.Write(pReadByte, 0, pReadByte.Length);
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
if(pFileStream ! =null) pFileStream.Close();
}
return true;
}
public static string ReadLine(string fileName)
{
if(! Exists(fileName)) {return null;
}
using (var fs = new FileStream(fileName, FileMode.Open))
{
return newStreamReader(fs).ReadLine(); }}/// <summary>
///Write files
/// </summary>
/// <param name="fileName">The file name</param>
/// <param name="content">The file content</param>
/// <returns></returns>
public static bool Write(string fileName, string content)
{
if (Exists(fileName) || content == null)
{
return false;
}
try
{
// Read file information into the stream
// Initializes a new instance of the system.io.FileStream class with the specified path and creation mode
using (var fs = new FileStream(fileName, FileMode.OpenOrCreate))
{
/ / lock the flow
lock (fs)
{
if(! fs.CanWrite) {throw new System.Security.SecurityException("The file fileName =" + fileName + "Read-only file cannot write!");
}
var buffer = Encoding.Default.GetBytes(content);
fs.Write(buffer, 0, buffer.Length);
return true;
}
}
}
catch (IOException ioe)
{
throw newException(ioe.Message); }}/// <summary>
///Write a line
/// </summary>
/// <param name="fileName">The file name</param>
/// <param name="content">content</param>
/// <returns></returns>
public static bool WriteLine(string fileName, string content)
{
if (string.IsNullOrEmpty(fileName))
throw new ArgumentNullException(fileName);
if (string.IsNullOrEmpty(content))
throw new ArgumentNullException(content);
using (var fs = new FileStream(fileName, FileMode.OpenOrCreate | FileMode.Append))
{
/ / lock the flow
lock (fs)
{
if(! fs.CanWrite) {throw new System.Security.SecurityException("The file fileName =" + fileName + "Read-only file cannot write!");
}
var sw = new StreamWriter(fs);
sw.WriteLine(content);
sw.Dispose();
sw.Close();
return true; }}}/// <summary>
///Copy directory
/// </summary>
/// <param name="fromDir">The directory to be copied</param>
/// <param name="toDir">Directory to copy to</param>
/// <returns></returns>
public static bool CopyDir(DirectoryInfo fromDir, string toDir)
{
return CopyDir(fromDir, toDir, fromDir.FullName);
}
/// <summary>
///Copy directory
/// </summary>
/// <param name="fromDir">The directory to be copied</param>
/// <param name="toDir">Directory to copy to</param>
/// <returns></returns>
public static bool CopyDir(string fromDir, string toDir)
{
if (fromDir == null || toDir == null)
{
throw new NullReferenceException("Parameter null");
}
if (fromDir == toDir)
{
throw new Exception("Both directories." + fromDir);
}
if(! Directory.Exists(fromDir)) {throw new IOException("Directory fromDir =" + fromDir + "Doesn't exist.");
}
var dir = new DirectoryInfo(fromDir);
return CopyDir(dir, toDir, dir.FullName);
}
/// <summary>
///Copy directory
/// </summary>
/// <param name="fromDir">The directory to be copied</param>
/// <param name="toDir">Directory to copy to</param>
/// <param name="rootDir">The root directory to be copied</param>
/// <returns></returns>
private static bool CopyDir(DirectoryInfo fromDir, string toDir, string rootDir)
{
foreach (var f in fromDir.GetFiles())
{
var filePath = toDir + f.FullName.Substring(rootDir.Length);
var newDir = filePath.Substring(0, filePath.LastIndexOf("\ \", StringComparison.Ordinal));
CreateDir(newDir);
File.Copy(f.FullName, filePath, true);
}
foreach (var dir in fromDir.GetDirectories())
{
CopyDir(dir, toDir, rootDir);
}
return true;
}
/// <summary>
///Delete the file
/// </summary>
/// <param name="fileName">The full path to the file</param>
/// <returns></returns>
public static bool DeleteFile(string fileName)
{
try
{
if(! Exists(fileName))return false;
File.Delete(fileName);
}
catch (IOException ioe)
{
throw new ArgumentNullException(ioe.Message);
}
return true;
}
public static void DeleteDir(DirectoryInfo dir)
{
if (dir == null)
{
throw new NullReferenceException("Directory does not exist");
}
foreach (var d in dir.GetDirectories())
{
DeleteDir(d);
}
foreach (var f in dir.GetFiles())
{
DeleteFile(f.FullName);
}
dir.Delete();
}
/// <summary>
///Delete the directory
/// </summary>
/// <param name="dir">The specified directory</param>
/// <param name="onlyDir">Whether to delete only directories</param>
/// <returns></returns>
public static bool DeleteDir(string dir, bool onlyDir)
{
if (dir == null || dir.Trim() == "")
{
throw new NullReferenceException("Directory dir =" + dir + "Doesn't exist.");
}
if(! Directory.Exists(dir)) {return false;
}
var dirInfo = new DirectoryInfo(dir);
if (dirInfo.GetFiles().Length == 0 && dirInfo.GetDirectories().Length == 0)
{
Directory.Delete(dir);
return true;
}
if(! onlyDir) {return false;
}
DeleteDir(dirInfo);
return true;
}
/// <summary>
///Finds files in the specified directory
/// </summary>
/// <param name="dir">directory</param>
/// <param name="fileName">The file name</param>
/// <returns></returns>
public static bool FindFile(string dir, string fileName)
{
if (dir == null || dir.Trim() == "" || fileName == null || fileName.Trim() == ""| |! Directory.Exists(dir)) {return false;
}
// Pass the file path to get the current file object
var dirInfo = new DirectoryInfo(dir);
return FindFile(dirInfo, fileName);
}
/// <summary>
///Returns whether the file exists
/// </summary>
/// <param name="dir"></param>
/// <param name="fileName"></param>
/// <returns></returns>
public static bool FindFile(DirectoryInfo dir, string fileName)
{
foreach (var d in dir.GetDirectories())
{
if (File.Exists(d.FullName + "\ \" + fileName))
{
return true;
}
FindFile(d, fileName);
}
return false;
}
/// <summary>
///Gets all folder names in the specified folder
/// </summary>
/// <param name="folderPath">The path</param>
/// <returns></returns>
public static List<string> FolderName(string folderPath)
{
var listFolderName = new List<string> ();try
{
var info = new DirectoryInfo(folderPath);
listFolderName.AddRange(info.GetDirectories().Select(nextFolder => nextFolder.Name));
}
catch (Exception er)
{
throw new Exception(er.Message);
}
return listFolderName;
}
/// <summary>
///Gets the name of the file in the specified folder
/// </summary>
/// <param name="folderPath">The path</param>
/// <returns></returns>
public static List<string> FileName(string folderPath)
{
var listFileName = new List<string> ();try
{
var info = new DirectoryInfo(folderPath);
listFileName.AddRange(info.GetFiles().Select(nextFile => nextFile.Name));
}
catch (Exception er)
{
throw new Exception(er.Message);
}
returnlistFileName; }}Copy the code