C#写入文件的几种方式
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C#写⼊⽂件的⼏种⽅式
1 1. FileStream.Write
2
3 string filePath = Directory.GetCurrentDirectory() + "\\" + Process.GetCurrentProcess().ProcessName + ".txt";
4 if (File.Exists(filePath))
5 File.Delete(filePath);
6
7 FileStream fs = new FileStream(filePath, FileMode.Create);
8 //获得字节数组
9
10 string xyPointer = string.Format("X: {0}, Y: {1}", this.Location.X.ToString(), this.Location.Y.ToString());
11 string highWidth = string.Format("\nW: {0}, H: {1}", this.Width.ToString(), this.Height.ToString());
12 byte[] data = System.Text.Encoding.Default.GetBytes(xyPointer + highWidth);
13 //开始写⼊
14 fs.Write(data, 0, data.Length);
15 //清空缓冲区、关闭流
16 fs.Flush();
17 fs.Close();
18
19 2. File.WriteAllLines
20
21 //如果⽂件不存在，则创建；存在则覆盖
22 //该⽅法写⼊字符数组换⾏显⽰
23 string[] lines = { "first line", "second line", "third line", "第四⾏" };
24 System.IO.File.WriteAllLines(@"C:\testDir\test.txt", lines, Encoding.UTF8);
25
26 3. File.WriteAllText
27
28 //如果⽂件不存在，则创建；存在则覆盖
29 string strTest = "该例⼦测试⼀个字符串写⼊⽂本⽂件。";
30 System.IO.File.WriteAllText(@"C:\testDir\test1.txt", strTest, Encoding.UTF8);
31
32 4. StreamWriter.Write
33
34 //在将⽂本写⼊⽂件前，处理⽂本⾏
35 //StreamWriter⼀个参数默认覆盖
36 //StreamWriter第⼆个参数为false覆盖现有⽂件，为true则把⽂本追加到⽂件末尾
37 using (System.IO.StreamWriter file = new System.IO.StreamWriter(@"C:\testDir\test2.txt", true))
38 {
39 foreach (string line in lines)
40 {
41 if (!line.Contains("second"))
42 {
43 file.Write(line);//直接追加⽂件末尾，不换⾏
44 file.WriteLine(line);// 直接追加⽂件末尾，换⾏
45 }
46 }
47 }
