文本文件从磁盘读取、写入

本文转自CSDN博客：http://blog.csdn.net/anchenyanyue/article/details/7666370

  1 using System;
  2 using System.Text;
  3 using System.IO;
  4
  5 namespace XXXX.Common
  6 {
  7     /// <summary>
  8     /// 文本文件从磁盘读取、写入
  9     /// </summary>
 10     public class FileHelper
 11     {
 12
 13         /// <summary>
 14         /// 从文件中读取文本内容
 15         /// </summary>
 16         /// <param name="filePath">文本路径</param>
 17         /// <returns>返回文件中的内容</returns>
 18         public static string Read(string filePath)
 19         {
 20             string result = string.Empty;
 21             if (File.Exists(filePath))
 22             {
 23                 using (StreamReader sr = new StreamReader(filePath, Encoding.Default))
 24                 {
 25                     result = sr.ReadToEnd();
 26                     sr.Close();
 27                     return result;
 28                 }
 29             }
 30             return result;
 31         }
 32
 33         /// <summary>
 34         /// 写入文本文件，按默认编码
 35         /// </summary>
 36         /// <param name="filePath">文本文件路径包括文件名</param>
 37         /// <param name="content">写入内容</param>
 38         public static void Write(string filePath, string content)
 39         {
 40             using (StreamWriter sw = new StreamWriter(filePath, false, Encoding.Default))
 41             {
 42                 sw.Write(content);
 43                 sw.Close();
 44             }
 45         }
 46         /// <summary>
 47         /// 写入文本文件，以UFT8格式编码
 48         /// </summary>
 49         /// <param name="filePath">文本文件路径包括文件名</param>
 50         /// <param name="content">写入内容</param>
 51         /// <param name="UTF8"></param>
 52         public static void Write(string filePath, string content, bool UTF8)
 53         {
 54             using (StreamWriter sw = new StreamWriter(filePath, false, Encoding.UTF8))
 55             {
 56                 sw.Write(content);
 57                 sw.Close();
 58             }
 59         }
 60
 61         /// <summary>
 62         /// 备份文件
 63         /// </summary>
 64         /// <param name="sourceFileName">源文件路径</param>
 65         /// <param name="destFileName">目标文件路径</param>
 66         /// <param name="overwrite">是否覆盖已存在文件</param>
 67         /// <returns></returns>
 68         public static bool BackupFile(string sourceFileName, string destFileName, bool overwrite)
 69         {
 70             bool flag;
 71             if (!File.Exists(sourceFileName))
 72             {
 73                 throw new FileNotFoundException(sourceFileName + "文件不存在！");
 74             }
 75             if (!overwrite && File.Exists(destFileName))
 76             {
 77                 return false;
 78             }
 79             try
 80             {
 81                 File.Copy(sourceFileName, destFileName, true);
 82                 flag = true;
 83             }
 84             catch (Exception exception)
 85             {
 86                 throw exception;
 87             }
 88             return flag;
 89         }
 90
 91         /// <summary>
 92         /// 拷贝文件夹文件
 93         /// </summary>
 94         /// <param name="srcDir"></param>
 95         /// <param name="dstDir"></param>
 96         public static void CopyDirFiles(string srcDir, string dstDir)
 97         {
 98             if (Directory.Exists(srcDir))
 99             {
100                 foreach (string str in Directory.GetFiles(srcDir))
101                 {
102                     string destFileName = Path.Combine(dstDir, Path.GetFileName(str));
103                     File.Copy(str, destFileName, true);
104                 }
105
106                 foreach (string str3 in Directory.GetDirectories(srcDir))
107                 {
108                     string str4 = str3.Substring(str3.LastIndexOf(@"\") + 1);
109                     CopyDirFiles(Path.Combine(srcDir, str4), Path.Combine(dstDir, str4));
110                 }
111             }
112         }
113
114         /// <summary>
115         /// 删除文件夹文件
116         /// </summary>
117         /// <param name="dir"></param>
118         public static void DeleteDirFiles(string dir)
119         {
120             if (Directory.Exists(dir))
121             {
122                 foreach (string str in Directory.GetFiles(dir))
123                 {
124                     File.Delete(str);
125                 }
126                 foreach (string str2 in Directory.GetDirectories(dir))
127                 {
128                     Directory.Delete(str2, true);
129                 }
130             }
131         }
132
133         /// <summary>
134         /// 获得文件最后修改时间
135         /// </summary>
136         /// <param name="file"></param>
137         /// <returns></returns>
138         public static DateTime GetFileLastWriteTime(string file)
139         {
140             if (File.Exists(file))
141             {
142                 return File.GetLastWriteTime(file);
143             }
144             return DateTime.MaxValue;
145         }
146
147         /// <summary>
148         /// 取消文件的只读属性
149         /// </summary>
150         /// <param name="file"></param>
151         public static void RemoveFileReadOnlyAttribute(string file)
152         {
153             File.SetAttributes(file, File.GetAttributes(file) & ~FileAttributes.ReadOnly);
154         }
155     }
156 }