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C# 文件操作类

时间:2015-07-19 14:56:59      阅读:121      评论:0      收藏:0      [点我收藏+]

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using System;

using System.IO;

 

namespace Utils

{

    public class IOHelper

    {

        public IOHelper();

 

        public static bool CopyDir(DirectoryInfo fromDir, string toDir);  //复制目录

        public static bool CopyDir(string fromDir, string toDir); //复制目录

        public static bool CreateDir(string dirName);  //创建目录

        public static bool CreateFile(string fileName);  //创建文件

        public static void DeleteDir(DirectoryInfo dir);  //删除目录 (如果目录中存在文件就删除)

        public static bool DeleteDir(string dir, bool onlyDir); //删除目录

        public static bool DeleteFile(string fileName);//删除文件

        public static bool Exists(string fileName);//判断文件是否存在

        public static bool FindFile(DirectoryInfo dir, string fileName);//在指定的目录中查找文件

        public static bool FindFile(string dir, string fileName);//在指定的目录中查找文件

        public static string Read(string fileName);//读文件的全部内容

        public static string ReadLine(string fileName);//读第一行数据

        public static bool Write(string fileName, string content);//写入指定的内容

 

        public static bool WriteLine(string fileName, string content);//写一行数据

    }

}

 

using System;

using System.Text;

using System.IO;

/*----------------------------------------------------------------

//文件名:IOHelper

//文件功能描述:文件操作类

 

----------------------------------------------------------------*/

namespace Utils

{

   public class IOHelper

    {

       /// <summary>

       /// 判断文件是否存在

       /// </summary>

       /// <param name="fileName"></param>

       /// <returns></returns>

       public static bool Exists(string fileName)

       {

           if (fileName == null || fileName.Trim() == "")

           {

               return false;

           }

 

           if (File.Exists(fileName))

           {

               return true;

           }

        

           return false;

       }

 

 

       /// <summary>

       /// 创建文件夹

       /// </summary>

       /// <param name="dirName"></param>

       /// <returns></returns>

       public static bool CreateDir(string dirName)

       {

           if (!Directory.Exists(dirName))

           {

               Directory.CreateDirectory(dirName);

           }

           return true;

       }

 

 

       /// <summary>

       /// 创建文件

       /// </summary>

       /// <param name="fileName"></param>

       /// <returns></returns>

       public static bool CreateFile(string fileName)

       {

           if (!File.Exists(fileName))

           {

               FileStream fs = File.Create(fileName);

               fs.Close();

               fs.Dispose();

           }

           return true;

 

       }

 

 

       /// <summary>

       /// 读文件内容

       /// </summary>

       /// <param name="fileName"></param>

       /// <returns></returns>

       public static string Read(string fileName)

       {

           if (!Exists(fileName))

           {

               return null;

           }

           //将文件信息读入流中

           using (FileStream fs = new FileStream(fileName, FileMode.Open))

           {

               return new StreamReader(fs).ReadToEnd();

           }

       }

 

 

       public static string ReadLine(string fileName)

       {

           if (!Exists(fileName))

           {

               return null;

           }

           using (FileStream fs = new FileStream(fileName, FileMode.Open))

           {

               return new StreamReader(fs).ReadLine();

           }

       }

       

 

       /// <summary>

       /// 写文件

       /// </summary>

       /// <param name="fileName">文件名</param>

       /// <param name="content">文件内容</param>

       /// <returns></returns>

       public static bool Write(string fileName, string content)

       {

           if (!Exists(fileName) || content == null)

           {

               return false;

           }

           

           //将文件信息读入流中

           using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate))

           {

               lock (fs)//锁住流

               {

                   if (!fs.CanWrite)

                   {

                       throw new System.Security.SecurityException("文件fileName=" + fileName + "是只读文件不能写入!");

                   }

 

                   byte[] buffer = Encoding.Default.GetBytes(content);

                   fs.Write(buffer, 0, buffer.Length);

                   return true;

               }

           }

       }

 

 

       /// <summary>

       /// 写入一行

       /// </summary>

       /// <param name="fileName">文件名</param>

       /// <param name="content">内容</param>

       /// <returns></returns>

       public static bool WriteLine(string fileName, string content)

       {

           using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate | FileMode.Append))

           {

               lock (fs)

               {

                   if (!fs.CanWrite)

                   {

                       throw new System.Security.SecurityException("文件fileName=" + fileName + "是只读文件不能写入!");

                   }

 

                   StreamWriter sw = new StreamWriter(fs);

                   sw.WriteLine(content);

                   sw.Dispose();

                   sw.Close();

                   return true;

               }

           }

       }

        

 

       public static bool CopyDir(DirectoryInfo fromDir, string toDir)

       {

           return CopyDir(fromDir, toDir, fromDir.FullName);

       }

 

 

       /// <summary>

       /// 复制目录

       /// </summary>

       /// <param name="fromDir">被复制的目录</param>

       /// <param name="toDir">复制到的目录</param>

       /// <returns></returns>

       public static bool CopyDir(string fromDir, string toDir)

       {

           if (fromDir == null || toDir == null)

           {

               throw new NullReferenceException("参数为空");

           }

 

           if (fromDir == toDir)

           {

               throw new Exception("两个目录都是" + fromDir);

           }

 

           if (!Directory.Exists(fromDir))

           {

               throw new IOException("目录fromDir="+fromDir+"不存在");

           }

          

           DirectoryInfo dir = new DirectoryInfo(fromDir);

           return CopyDir(dir, toDir, dir.FullName);

       }

 

 

       /// <summary>

       /// 复制目录

       /// </summary>

       /// <param name="fromDir">被复制的目录</param>

       /// <param name="toDir">复制到的目录</param>

       /// <param name="rootDir">被复制的根目录</param>

       /// <returns></returns>

       private static bool CopyDir(DirectoryInfo fromDir, string toDir, string rootDir)

       {

           string filePath = string.Empty;

           foreach (FileInfo f in fromDir.GetFiles())

           {

               filePath = toDir + f.FullName.Substring(rootDir.Length);

               string newDir = filePath.Substring(0, filePath.LastIndexOf("\\"));

               CreateDir(newDir);

               File.Copy(f.FullName, filePath, true);

           }

 

           foreach (DirectoryInfo dir in fromDir.GetDirectories())

           {

               CopyDir(dir, toDir, rootDir);

           }

 

           return true;

       }

 

 

       /// <summary>

       /// 删除文件

       /// </summary>

       /// <param name="fileName">文件的完整路径</param>

       /// <returns></returns>

       public static bool DeleteFile(string fileName)

       {

           if (Exists(fileName))

           {

               File.Delete(fileName);

               return true;

           }

           return false;

       }

 

 

       public static void DeleteDir(DirectoryInfo dir)

       {

           if (dir == null)

           {

               throw new NullReferenceException("目录不存在");

           }

           

           foreach (DirectoryInfo d in dir.GetDirectories())

           {

               DeleteDir(d);

           }

 

           foreach (FileInfo f in dir.GetFiles())

           {

               DeleteFile(f.FullName);

           }

 

           dir.Delete();

 

       }

 

 

       /// <summary>

       /// 删除目录

       /// </summary>

       /// <param name="dir">制定目录</param>

       /// <param name="onlyDir">是否只删除目录</param>

       /// <returns></returns>

       public static bool DeleteDir(string dir, bool onlyDir)

       {

           if (dir == null || dir.Trim() == "")

           {

               throw new NullReferenceException("目录dir=" + dir + "不存在");

           }

 

           if (!Directory.Exists(dir))

           {

               return false;

           }

 

           DirectoryInfo dirInfo = new DirectoryInfo(dir);

           if (dirInfo.GetFiles().Length == 0 && dirInfo.GetDirectories().Length==0)

           {

               Directory.Delete(dir);

               return true;

           }

 

 

           if (!onlyDir)

           {

               return false;

           }

           else

           {

               DeleteDir(dirInfo);

               return true;

           }

           

       }

 

 

       /// <summary>

       /// 在指定的目录中查找文件

       /// </summary>

       /// <param name="dir">目录</param>

       /// <param name="fileName">文件名</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;

           }

 

           DirectoryInfo dirInfo = new DirectoryInfo(dir);

           return FindFile(dirInfo, fileName);

 

       }

 

 

       public static bool FindFile(DirectoryInfo dir, string fileName)

       {

           foreach (DirectoryInfo d in dir.GetDirectories())

           {

               if (File.Exists(d.FullName + "\\" + fileName))

               {

                   return true;

               }

               FindFile(d,fileName);

           }

 

           return false;

       }

       

    }

}

C# 文件操作类

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原文地址:http://www.cnblogs.com/wyBlog117/p/4658595.html

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