我们偶尔会用到文件操作，其中File、Path和Directory这三个类是比较常见的，今天写了一个测试demo，也是顺便学习一下，记录一二。
BTW，使用这几个类的时候需要引用using System.IO命名空间。
1 class Program
2 {
3 static void Main(string[] args)
4 {
5 //ProcessPath();
6 //ProcessFile();
7 //ReadFileByByteArray();
8 //ReadFileByAllLines();
9 //ReadFileByAllText();
10 //WriteFileByByteArray();
11 //WriteFileByLines();
12 //WriteFileByText();
13 UseDirectory();
14 Console.ReadKey();
15 }
16 /// <summary>
17 /// path类只是在string层面进行操作
18 /// </summary>
19 private static void ProcessPath()
20 {
21 string path = @"C:\Users\Administrator\Desktop\XX-Net.txt";
22 string directory = Path.GetDirectoryName(path);
23 string fileName = Path.GetFileName(path);
24 string fileNamenoExtension = Path.GetFileNameWithoutExtension(path);
25 string fileExtension = Path.GetExtension(path);
26 string ss = Path.ChangeExtension(path, "csv");
27 Console.WriteLine($"directory is {directory},fileName is {fileName},file without extension is{fileNamenoExtension},extension is {fileExtension},new file is{ss} ");
28 }
29 private static void ProcessFile()
30 {
31 string path = @"C:\Users\Administrator\Desktop\2.txt";
32 //File.Create(path);
33 //File.Delete(path);
34 //File.Copy(path, @"C:\Users\Administrator\Desktop\3.txt");
35 File.Move(path, @"C:\Users\Administrator\Desktop\4.txt");
36 Console.WriteLine("creat successfully...");
37 }
38 private static void ReadFileByByteArray()
39 {
40 string path = @"C:\Users\Administrator\Desktop\3.txt";
41 byte[] fileByte = File.ReadAllBytes(path);
42 string fileByByte = Encoding.Default.GetString(fileByte);
43 Console.WriteLine(fileByByte);
44 }
45 private static void ReadFileByAllLines()
46 {
47 string path = @"C:\Users\Administrator\Desktop\3.txt";
48 string[] fileLines = File.ReadAllLines(path,Encoding.Default);
49 foreach (var line in fileLines)
50 {
51 Console.WriteLine(line);
52 }
53 }
54 private static void ReadFileByAllText()
55 {
56 string path = @"C:\Users\Administrator\Desktop\3.txt";
57 string fileText = File.ReadAllText(path,Encoding.Default);
58 Console.WriteLine(fileText);
59 }
60 private static void WriteFileByByteArray()
61 {
62 string path = @"C:\Users\Administrator\Desktop\1.txt";
63 string fileStr = "大家好，我来了，我的号码是1388888888";
64 byte[] fileByte = Encoding.Default.GetBytes(fileStr);
65 File.WriteAllBytes(path, fileByte);
66 Console.WriteLine("Write Sucessfully...");
67 }
68 private static void WriteFileByLines()
69 {
70 string path = @"C:\Users\Administrator\Desktop\1.txt";
71 string[] fileArray = { "你好","我的名字","叫Tom","我来自安徽省阜阳市太和县","他们","都知道我是个好人" };
72 File.WriteAllLines(path, fileArray);
73 Console.WriteLine("Write Sucessfully...");
74 }
75 private static void WriteFileByText()
76 {
77 string path = @"C:\Users\Administrator\Desktop\1.txt";
78 //File.WriteAllText(path, "落霞与孤鹜齐飞，秋水共长天一色。");
79 File.AppendAllText(path, "宜将剩勇追穷寇，不可沽名学霸王！");
80 Console.WriteLine("Write Sucessfully...");
81 }
82 private static void UseDirectory()
83 {
84 //Directory.CreateDirectory(@"C:\Users\Administrator\Desktop\NewFolder");
85 //Directory.Delete(@"C:\Users\Administrator\Desktop\NewFolder",true);
86
87 string[] files = Directory.GetFiles(@"D:\迅雷下载", "*.rmvb",SearchOption.TopDirectoryOnly);
88 foreach (var file in files)
89 {
90 Console.WriteLine(file);
91 }
92 Console.WriteLine("Get File Successfully...");
93
94 }
95 }
