文本文件从磁盘读取、写入

1. usingSystem;
2. usingSystem.Text;
3. usingSystem.IO;
5. namespaceXXXX.Common
6. {
7. ///<summary>
8. ///文本文件从磁盘读取、写入
9. ///</summary>
10. publicclassFileHelper
11. {
13. ///<summary>
14. ///从文件中读取文本内容
15. ///</summary>
16. ///<paramname="filePath">文本路径</param>
17. ///<returns>返回文件中的内容</returns>
18. publicstaticstringRead(stringfilePath)
19. {
20. stringresult=string.Empty;
21. if(File.Exists(filePath))
22. {
23. using(StreamReadersr=newStreamReader(filePath,Encoding.Default))
24. {
25. result=sr.ReadToEnd();
26. sr.Close();
27. returnresult;
28. }
29. }
30. returnresult;
31. }
33. ///<summary>
34. ///写入文本文件，按默认编码
35. ///</summary>
36. ///<paramname="filePath">文本文件路径包括文件名</param>
37. ///<paramname="content">写入内容</param>
38. publicstaticvoidWrite(stringfilePath,stringcontent)
39. {
40. using(StreamWritersw=newStreamWriter(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. ///<paramname="filePath">文本文件路径包括文件名</param>
50. ///<paramname="content">写入内容</param>
51. ///<paramname="UTF8"></param>
52. publicstaticvoidWrite(stringfilePath,stringcontent,boolUTF8)
53. {
54. using(StreamWritersw=newStreamWriter(filePath,false,Encoding.UTF8))
55. {
56. sw.Write(content);
57. sw.Close();
58. }
59. }
61. ///<summary>
62. ///备份文件
63. ///</summary>
64. ///<paramname="sourceFileName">源文件路径</param>
65. ///<paramname="destFileName">目标文件路径</param>
66. ///<paramname="overwrite">是否覆盖已存在文件</param>
67. ///<returns></returns>
68. publicstaticboolBackupFile(stringsourceFileName,stringdestFileName,booloverwrite)
69. {
70. boolflag;
71. if(!File.Exists(sourceFileName))
72. {
73. thrownewFileNotFoundException(sourceFileName+"文件不存在！");
74. }
75. if(!overwrite&&File.Exists(destFileName))
76. {
77. returnfalse;
78. }
79. try
80. {
81. File.Copy(sourceFileName,destFileName,true);
82. flag=true;
83. }
84. catch(Exceptionexception)
85. {
86. throwexception;
87. }
88. returnflag;
89. }
91. ///<summary>
92. ///拷贝文件夹文件
93. ///</summary>
94. ///<paramname="srcDir"></param>
95. ///<paramname="dstDir"></param>
96. publicstaticvoidCopyDirFiles(stringsrcDir,stringdstDir)
97. {
98. if(Directory.Exists(srcDir))
99. {
100. foreach(stringstrinDirectory.GetFiles(srcDir))
101. {
102. stringdestFileName=Path.Combine(dstDir,Path.GetFileName(str));
103. File.Copy(str,destFileName,true);
104. }
106. foreach(stringstr3inDirectory.GetDirectories(srcDir))
107. {
108. stringstr4=str3.Substring(str3.LastIndexOf(@"\")+1);
109. CopyDirFiles(Path.Combine(srcDir,str4),Path.Combine(dstDir,str4));
110. }
111. }
112. }
114. ///<summary>
115. ///删除文件夹文件
116. ///</summary>
117. ///<paramname="dir"></param>
118. publicstaticvoidDeleteDirFiles(stringdir)
119. {
120. if(Directory.Exists(dir))
121. {
122. foreach(stringstrinDirectory.GetFiles(dir))
123. {
124. File.Delete(str);
125. }
126. foreach(stringstr2inDirectory.GetDirectories(dir))
127. {
128. Directory.Delete(str2,true);
129. }
130. }
131. }
133. ///<summary>
134. ///获得文件最后修改时间
135. ///</summary>
136. ///<paramname="file"></param>
137. ///<returns></returns>
138. publicstaticDateTimeGetFileLastWriteTime(stringfile)
139. {
140. if(File.Exists(file))
141. {
142. returnFile.GetLastWriteTime(file);
143. }
144. returnDateTime.MaxValue;
145. }
147. ///<summary>
148. ///取消文件的只读属性
149. ///</summary>
150. ///<paramname="file"></param>
151. publicstaticvoidRemoveFileReadOnlyAttribute(stringfile)
152. {
153. File.SetAttributes(file,File.GetAttributes(file)&~FileAttributes.ReadOnly);
154. }
155. }
156. }