c# 读取txt文件的各种用法

1. //行番号
2. int iLine = 0;
3. //如何在textbox里显示txt文件的内容
4. string path = @"D:/test.txt";//读取文件txt
5. StringBuilder b = new StringBuilder();
6. using (FileStream fs = new FileStream(path, FileMode.Open))
7. {
8. using (StreamReader sr = new StreamReader(fs))
9. {
10. while (!sr.EndOfStream)
11. {
12. string sLine = sr.ReadLine();
13. if (sLine.Length < 1)
14. {
15. continue;
16. }
17. string sRecordKbn = sLine.Substring(0,8);//截取的数据
18.  
19. b.Append(sRecordKbn+"/r/n");
20. }
21. }
22. }
23.  
24. TextBox1.Text = b.ToString();
25.  
26. #region/////////////////////////第一种将默认的行终止符（或指定字符串的副本和默认的行终止符）追加到此实例的末尾。
27.  
28. string path = @"D:/test.txt";//读取文件txt
29. string savepath = @"D:/test1.txt";//存放文件txt
30. using (FileStream fs = new FileStream(path, FileMode.Open))
31. {
32. using (StreamReader sr = new StreamReader(fs))
33. {
34. while (!sr.EndOfStream)
35. {
36. iLine++;
37. string sLine = sr.ReadLine();
38. if (sLine.Length < 1)
39. {
40. continue;
41. }
42. string sRecordKbn = sLine.Substring(0, 8);//截取的数据
43. StringBuilder b = new StringBuilder();
44. b.AppendLine(sRecordKbn);//将默认的行终止符追加到当前 StringBuilder 对象的末尾。
45. //另存到其他txt文件中
46. if (File.Exists(savepath))
47. {
48. using (StreamWriter sw = File.AppendText(savepath))
49. {
50. sw.WriteLine(b.ToString());
51. }
52. }
53. }
54. }
55. }
56. #endregion
57. #region/////////////////////////第一种读取文件然后存放到另外文件里面。
58. string path = @"D:/test.txt";//读取文件txt
59. string savepath = @"D:/test1.txt";//存放文件txt
60. using (FileStream fs = new FileStream(path, FileMode.Open))
61. {
62. using (StreamReader sr = new StreamReader(fs))
63. {
64. while (!sr.EndOfStream)
65. {
66. iLine++;
67. string sLine = sr.ReadLine();
68. if (sLine.Length < 1)
69. {
70. continue;
71. }
72. if (iLine % 2 == 0)
73. {
74. string sRecordKbn = sLine.Substring(0, 8);//截取的数据
75. StringBuilder b = new StringBuilder();
76. b.AppendLine(sRecordKbn);
77. //另存到其他txt文件中
78. if (File.Exists(savepath))
79. {
80. using (StreamWriter sw = File.AppendText(savepath))
81. {
82.  
83. sw.WriteLine(b.ToString());
84.  
85. }
86. }
87.  
88. }
89. }
90. }
91. }
92. #endregion
93. #region /////////////////////////第二种改正
94. using (StreamReader sr = new StreamReader(@"D:/test.txt"))//读取文件txt
95. {
96. while (!sr.EndOfStream)
97. {
98. iLine++;
99. string sLine = sr.ReadLine();
100. if (sLine.Length < 1)
101. {
102. continue;
103. }
104. if (iLine % 2 == 0)
105. {
106. string sRecordKbn = sLine.Substring(0, 8);//截取的数据
107. if (File.Exists(@"D:/test1.txt"))//提出数据存放文件txt
108. {
109. using (StreamWriter sw = File.AppendText(@"D:/test1.txt"))
110. {
111. sw.WriteLine(sRecordKbn);
112. }
113. }
114. else//文件不存在创建文件
115. {
116. FileStream fs;
117. fs = File.Create(@"D:/test1.txt");//创建不要用file创建
118. //使用File.Create创建再复制/移动/删除时会提示：文件正由另一进程使用,因此该进程无法访问该文件
119. //改用 FileStream 获取 File.Create 返回的 System.IO.FileStream 再进行关闭就无此问题
120. fs.Close();
121. using (StreamWriter sw = File.AppendText(@"D:/test1.txt"))
122. {
123. sw.WriteLine(sRecordKbn);
124. }
125.  
126. }
127. }
128. }
129. }
130. #endregion

 

http://blog.csdn.net/kongwei521/article/details/6456416